REPLACEMENT SPARES CATALOGUE - Prescott Speed Hill Climb

REPLACEMENT SPARES CATALOGUE 

Prescott Hill 

Gotherington 

Cheltenham 

Glos. GL52 9RD 

www.prescott-hillclimb.com 

Parts Available Only to Club Members

The Spares department functions as a service to Club members and can only operate with your support. 

Our prices remain competitive in relation to the quality standards that we insist upon from our suppliers. 

Stock items are readily available. Over the years much information has been compiled with regard to 

a source of supply for many parts which are not listed in the spares catalogue. If you cannot find the 

parts you require in the catalogue then please do contact us giving full details of your requirements 

and we will pursue the matter for you. 

The Spares Department is open Tuesday and Thursday between 0900 and 1630 hours UK time. When 

the Department is closed, please do fax or e-mail your orders or inquiries and we will contact you on 

re-opening. 

Trish Davis, Spares Controller. 

E-mail: spares@bugatti.co.uk 

Tel: 0044 (0)1242 675496 

Fax: 0044 (0)1242 677001 

Spares Department, Bugatti Owners’ Club, Prescott Hill, Gotherington, Cheltenham, Glos. GL52 9RD. 

Some Parts Shown may be ‘Special Order Items Only’, 

Please Enquire for Availability and Latest Price 

Bugatti Replacements Parts Catalogue 

Contents List 

A 

Sections:- 

1. Engine Parts 

2. Axles, Wheels and Brakes 

3. Steering 

4. Clutch 

5. Gearbox and transmission 

6. Chassis 

7. Engine Valves and Guides 

8. Springs 

9. Instruments and Miscellaneous Items 

10. Leather Items 

11. Washers and Gaskets 

12. Tools 

13. Fasteners 

14. Publications and Drawings 

15. Castings Numerical List with Photographs 

B 

Data on:- 

a. Bugatti Screw threads 

b. Bugatti Steels 

c. Tyre Gearing 

d. Lubrication Recommendations 

1

1. Engine Parts 

Stock Code Description Model 

1.1 Crankcase Castings 

A129 Crankcase top 37, 37A, 40 

A151 Bearing Cap rear 37, 40 

A152 Bearing Cap front (bronze) 37,40 

A160 Bearing Cap centre 37, 40 

A14 Cap for Crankcase Breather (item 13) 

A55 Dynamo Cradle, at front of Crankcase 37 

A120 Dynamo Housing 44 


A8 Oil Filler Cap, not lettered Several 

A98 Oil Filler Elbow 40 

A105 Front Engine Cover 35 

A150 Oil Pipe Take-off Fitting (bronze) 35, 37, 43 

A147 Oil Level Cover, R.H. side, square 35, 37, 43 

A155 Oil level float casing. Various 

1.2 Cylinder Blocks and Pistons 

Cylinder block castings for the following models are usually available, as the club owns appropriate patterns. 

Bare castings are sold on the basis that an approved machine shop does the machining under a separate 

contract between the purchaser and the shop. Due to the risk of defects being found during machining the 

Club does not wish to sell castings direct for machining by other shops. Regularly available, but confirm: 

37MOT60 T37 Block T37-40 

57MOT37 T57 Block T57 

Normally blocks are supplied with standard bores (69mm), except Type 57 (72mm), but oversize can often 

be arranged (e.g. T37 at 69.5 so that standard Volkswagen Polo Pistons (which are stocked) can be used) 

Aluminium Plates, top of cylinder block, fully drilled. 

C10A Aluminium Closing Plate 37, 40, 44, 49 

C10B Aluminium Closing Plate 35, 35B, 35C, 43 

C10C Aluminium Closing Plate 30, 35A, 38 

2

1.3 Cambox Castings 

A126 Cambox Casing, less bushes 30, 35, 38, 43 

A86 Cambox lid for A126 30, 35, 38, 43 

A148 Cambox Casting, less bushes 37, 40 

A97 Cambox Lid (4 cylinder) 37, 41 

A79 Cover for Vertical Drive, front of block 37, 40 

A56 

Air Pump Drive Housing, bronze, rear of 

cambox, on which air pump sits 35A, 37 

A17 Step Up Gear Housing, rear of cambox 35, 43 

A99 Air Pump Body (bronze), remove one boss 35, 37 

A9 

Water Elbow on cambox, circular flange 

to make square at various angles 30, 35, 37A, 43, 44,49 

A84A Water Elbow on cambox, RH 37, 40 

A84B Water Elbow on cambox, LH 37, 40 

57AC01 Cambox Casing 57, 59 

57AC02 Cambox Casing 57, 59 

57AC21 Cambox lid 57, 59 

57AC22 Cambox lid 57, 59 

57AC17 BRG Cap for the above 57, 59 




1.4 Blower And Drive 

A20 Blower Drive Housing, rear casing 35B, 35C, 37A, 43, 51, 55 

A21A Front Cover for Blower Housing A20 35B, 35C, 37A, 51 

A21B Front Cover for Blower Housing A20, 

G.P. models 43, 55 

A16 Nose Piece on Blower Drive Casing (bronze) 35B, 35C, 37A, 51 

1.5 Inlet Manifolds 

A131 Inlet Manifold, single carburettor 37 

A108 Manifold Adaptor, twin 30 Solex to block 37, 40, Brescia 

A108 A Manifold Adaptor, 35 Solex to block 37, 40, Brescia 

A103 Inlet Manifold, on block (pairs) 30, 35, 38, 43 

A149 Inlet Manifold, later long type Brescia 

A18 Inlet Manifold, Y-piece for blown engine 35B, 35C, 43 

A19 Safety Valve Cap, for item 18 

(and 37A Manifold) 

35B, 35C, 43, 37A 

A36 Inlet Manifold above Blower 51, 55 

A37 Safety Valve Housing for A36 51, 55 

A106 Ignition Tube Support (on manifold) 35, 43 

A145 Ignition Tube Support (on manifold) 37 

3

1.6 Water Pump Castings 

A1A Water Pump Body. 35, 43 

A1B Water Pump Body. 51, 55 

A2 Water Pump Body, Large blown T37A. 37A 

A75 Water Pump Body, small pump. 37, 40 

A118 Water Pump Body (late type) 44 

A95 Water Pump Body (57 MOT 10) 57 

A3 

Water Pump, Outer Cover, with water inlet 

connection (large pump) 30, 35, 37A, 43, 44, 46 

A76 Outer Cover for small pump A75, 

aluminium alloy 37, 40 

A76A Outer Cover for small pump A75, (bronze) Brescia 

A96 Outer Cover for A95 57 

A5 Impeller, water pump, large LH spiral 30, 35, 43, 46, 51, 55 

A6 Impeller, water pump, large RH spiral 37A, 44 

A77 Impeller, water pump, small aluminium alloy 37, 40 

A77A Impeller, water pump, small (bronze) Brescia 

1.6 Water Pump Spindles 

C39A Water pump spindle, short. 35, 43 

C39B Water pump spindle, medium. 37, 40 

C39C 

Water pump spindle, long, for integral 

gear type. 35, 43, 51, 55 

C39D Water pump pkg- 100% Graphited PTFE - 

1 metre 

1.7 Water Manifolds 

A102 Water Manifold, long RH side of engine 30, 35, 38, 43 

A138 Counterpiece for A102 30, 35, 38, 43 

A146 Water Manifold, cranked end 37, 40 

A91 Water Pipe, front of engine 35 

A100 

Water Pipe, front of engine, early type 

with extra offset (no recess in front cover) 35 

A88 Water Manifold, left side of engine 44 

A7 

Water Manifold, right side of engine, 

large inlet 

37A 

A4 Water Pipe, front. 37A 

A39 Water pipe, lower to radiator (T57 solid engine) 57 

A73 Water Gallery Manifold, on block 57 

A80 Top Water pipe, Y piece, for thermometer. 57 



4

1.8 Oil Pumps 

A139 Oil Pump Body 35, 38, 43, 51 

A142 Oil Pump Body 37, 40 

A140 

Cover for A139, A142 

A144 Oil Pump Body Brescia 

A157 Oil Pump Body 44 

A158 Cover for A157 44 

A159 Relief Valve Cover 44 

A156 Oil Pump/Water Pump Drive Housing 44 

57MOT13 Oil Filter Base 57 

1.9 Engine Gears 

46MOT93 Oil Pump Drive, Fibre 46, 50 

57AC53 Camshaft Gear, Fibre 57, 57C 

57MOT317 Camshaft Gear, lower intermediate, fibre 57 

57MOT317(S) Camshaft Gear, Lower Intermediate, STEEL 57S 

57MOT318 Camshaft Gear, upper intermediate, c.iron. 57 

1.10 Ball races 

98202 Ball Race - Vertical drive Brescia 

6208 Ball Race - Rear Hub 

98209 Ball Race - Inside Clutch, Trunnion 45x85x11 Several Models 

4207 Ball Race - Output Shaft 

9202 Ball Race 

5

2. Axles, Wheels, Brakes 

Steel Parts 

Castings 

C36 Front Axle Die Forging, for G.P. 35A, 37 

C38A Hand Forging for Brescia front axle Brescia 

C38B 

Hand Forging for Brescia front axle, 

dropped for T13Brescia 

C35A Brake Drum Pressing, 270mm dia. Brescia, 35A, 37, 40 

C35B 

Brake Drum Pressing, large brakes, 

uses fin casting A 128 44, 49 

C35C 

Shock Absorber Drum 

C23 Brake Lever Forging - Universal Several 

C27 Differential cruciform. 30-35 

C15A/L Wheel Nut, 4 eared, L/H. 

C15A/R Wheel Nut, 4 eared, R/H. 

C15B/L Wheel Nut, 2 eared, L/H. 37 

C15B/R Wheel Nut, 2 eared, R/H. 37 

C40A Tab Washer, between stub axle nuts Several 

C40B Tab Washer, front spring pivot block Touring, 57 

C44 

Stub Axle Forging, from accurate, RH type, 

remove one boss for LH 

G.P., Brescia 

C46 

Front Brake Steel Backplate Spinning, 

large brakes G.P., 43 

C51 Front Brake Backplate Spinning, small brakes Brescia, 37 

C47 Brake Cable Eye Forging Several 

C48 Brake Pulley Several 

C49 Brake Sprocket Several 

C50 Brake Chain (price per metre) Several 

6208 Ball Race, rear hub 

A11 Hub End Cover, small 35A, 37, 40, 44, 49 

A12 Hub End Cover, large 35, 43, 51, 55 

A89 

Brake Shoe, double, cast iron, 

machines to two widths 

35A, 37, 40, Brescia 

A32 

Brake shoe ring, makes 2, aluminium, for 

330mm 

Several 

A128 Brake Drum Fin Ring Casting, large brakes 44, 49, some 37 

A45 Brake Pedal Pad 35, 37, 51 

A82 Brake Pedal Pad Touring cars 

A64 

Back Plate for rear brakes, large diameter, 

machines to 35 or 43 35, 43, 51 

A101 Jacking Wedge, rear axle 35, 51 

A121 Jacking Pad on rear axle Touring 

A143 Thrust Collar, rear axle, H/T bronze Several 

57EA87 Brake Shoe, makes 2. 57 (Hydraulic) 

64EA1 Back plate, front. 57(Hydraulic) 

57PA140 Back plate, rear, RH 57(Hydraulic) 

57PA141 Back plate, rear, L.H. 57(Hydraulic) 

6

3. Steering Parts 

Castings 

C18 

Steering Wheel, nickel plated centre, 

walnut rim 

G.P. 

C18A Steering Wheel T57 57 

C18B Steering Wheel.- Brescia Brescia 

C29 

Curved Steering Arm Die forging; in high 

tensile material, with drawing and instructions 

for bending ball end after machining 35, 37 

A38A Steering Extension Bracket (cast iron) 37A 

A38B Steering Extension Bracket (cast iron) 35B, 35C, 51 

A110 Steering Box Distance Block 44 

A70 Steering Box Housing 35, 37, 51 

A71 End Cover for A70 35, 37, 51 

A133 

End Cover, heat treated for touring 

steering box 

Touring 

A137 King pin Pulley Swivel/cover Several 

4. Clutch Castings 

A44 

Clutch Tray below flywheel 

(larger radius than 35) 

37, 37A 

A87 Clutch Tray below flywheel 35, 51 

A74 Clutch Yoke Swinging Block 35, 37, 51 

A123 Clutch Cover (bronze) Brescia 

A85 Clutch Yoke Grunion, early cars (bronze) Brescia 

A153 Sliding Lever Yoke (bronze) Several 

A154 Adjusting Nut (bronze) Several 

A83 Clutch yoke swinging block 44, 49 

98209 Ball Race - Inside clutch trunnion, 45x85x11 Several 

7

5. Gearbox, Transmission Castings 

A130 Gearbox case. Brescia 

A25 Gearbox Casing, G.P. 35, 37, 51 

A26 Gearbox Lid for item 25, 130 35, 37, 51, 30, late Brescia 

A34 

Gearbox Top with provision for starter motor, 

machines to 35 or 37 35, 37 

A27 Front Cover for item 25 35, 37, 51, 30, late Brescia 

A28 Layshaft End Cover for item 25 35, 37, 51, 30, late Brescia 

A29 

Selector Box Housing for rear of 

item 25 (bronze) 

35, 37, 51, 30, late Brescia 

A30 Top Cover for item 29 (bronze) 35, 37, 51, 30, late Brescia 

A31 

Front Cover for selector rods and 

spring detents 

35, 37, 51, 30, late Brescia 

A23 Gear Lever Gate, stainless steel casting 35, 37, 51, 30, late Brescia 

A122 Gearbox Filler Nut (to be threaded 50 x 1.5p) 35, 37, 51, 30, late Brescia 

57CV1 Gearbox Case Casting 57 

Fabric heavy type couplings, propeller shaft, 

C33 

Touring cars, 9mm bolts T57, 11mm bolts 

(drill out) 

4207 Ball Race - output shaft 57 

6. Chassis Castings 

Tank - Castings 

A42A Front Spring, Rear hanger, RH for G.P. 35, 37, 51 

A42B Front Spring, Rear hanger, LH for G.P. 35, 37, 51 

A92A Front Spring, rear hanger, RH Touring cars 

A92B Front Spring, rear hanger, LH. Touring cars 

A93 Cover for A92. Touring cars 

A49 Distance Block, rear shock absorber 35, 37, 51 

A10 Magneto Cradle on dash 35, 37A, 43, 51, 55 

A58 Magneto Cradle, twin type, on dash Brescia 

A47 

Bracket, Aluminium, short, for A-R 

mechanism. 35, 43 

A48 

Bracket, Aluminium, long, for A-R mechanism. 37A 

A46 Bronze Pivot for A-R Lever 35, 37A, 43 

A50 Steering Column Bracket on dash, G.P. 35, 37, 51 

A81 Dynamo Cradle on dash, G.P. 35, 37 

A104 Accelerator Lever pivot Blocks 35, 37, 43 

A107 3-way Air Valve Body (bronze) 43 

A15 Tacho Pulley 35, 37A, 43, 51 

A78 Bonnet (hood) Hinge Bracket (bronze) Several 

A40 Fuel tank collar, G.P. (bronze) 35, 37, 51 

A41 Fuel Tank Saddle Pieces, G.P. (bronze) 35, 37, 51 

A33 Tank Cap, eared, G.P. 35, 37, 51 

A59 Tank Cap, not eared, aluminium alloy Touring 

A60 

Radiator Cap, for 65mm thread 

(not T57) (bronze) 

Most cars 

8

7. Engine Valves And Guides (Not Angles) 

Guides, Aluminium, Bronze 

Valve Cotters 

Valve Caps 

G1-4I Inlet Valves for 69/72mm blocks (8 per block) 

G1-4E Exhaust Valves for 69/72mm blocks 

(4 per block (x2 for 8 cylinder cars) 37, 40, 44, 49 

G1-3I Inlet Valve (23.5mm dia, stem 8, length 123mm, 

30°) for 60mm blocks (not T30 or 38) 

G1-3E Exhaust Valves (35mm dia, stem 9, length 

125mm, 45°) for 60mm blocks (not T30 or 38) 35, 43 

G1-3AI Inlet Valve (23.5mm dia, stem 8, length 

123mm, 30°) for 60mm blocks Late 35 

G1-2 Valve for Brescia, all Exhaust Valve quality 

(28mm dia, stem 8, length 113.5mm, 30°) Brescia 

G1-7 Valves T57, all Exhaust Valve quality 

(41mm dia, stem 8, length 122.75mm, 45°) 57 

G2-4I Inlet Guides for valves G1-4 

G2-4E Exhaust Guides for valves G1-4 

G2-3I Inlet Guides for valves G1-3 or G1-3A 

G2-3E Exhaust Guides for valves G1-3 or G1-3A 

G2-2 Use T35 Inlet Guides and shorten upper 

end G2 

Brescia 

G2-7 Guides for valves G1-7 57 

G3A 

Cotters for Valves, 8mm stem, 

G3B 

Cotters for 9mm stem. 

G3C Cotters for Valves, G1-7. 57, also 51 

G5A 

Valve Spring Top Cap with taper hole 

for cotter Inlet:30, 35, 38, 43 

(8 per block) 

G5B 


for cotter Exhaust: 30, 35, 38, 43 

(4 per block) 

G5C 


for cotter Inlet: 37, 40, 44, 49 

(8 per block) 

G5D 


for cotter Exhaust: 37, 40, 44, 49 

(4 per block) 

G5E Valve Spring Top Cap 57 

G4A 

Valve Adjustment Cap, 8mm 

G4B 

Valve Adjustment Cap, 9mm 

9

7. Engine Valves And Guides 

Flanged Washers For Under Springs 

G6A Flanged washer - 35 Inlet 35 

G6B Flanged - 35 Exhaust, 37 Inlet 35, 37 

G6C Flanged washer - 37 Exhaust 37 

G6D Flanged washer - '57 Inlet, Exhaust 57 

8. Springs 

F1A Inlet Double Valve Spring 30, 35, 43 

F1B 

Exhaust Double Valve Spring/Inlet 

Double Valve 30, 35, 43 

F2B Exhaust and Inlet Double Valve Spring 37, 40 

F3 Prop. Shaft Coupling Spring (sets of 4) 

F4 Track Rod End Spring (sets of 4) 40 

F4A Track Rod End Spring (sets of 4) 38, 43, 44 

F5 

Crankshaft Vibration Damper Spring 

(sets of 12) 57 

F6 Clutch Springs (pairs) G.P. 

F7A Shock Absorber Springs 5.5 dia Section G.P. 

F7B Shock Absorber Springs 6.0dia Section G.P. 

F8 Brescia Double Valve Spring Brescia 

F10 Air Pump Spring (on cambox) G.P. 

F11 Inlet/Exhaust Double Valve Spring - T57 57 

F12 Inlet/Exhaust Triple Valve Spring 51 

F13 

Water Pump Greaser Spring 

10

9. Miscellaneous Items Including Kits of Parts And Accessories 

C4/700 Tacho Belt 700mm G.P. 







C4/785/35 Dynamo Drive Belt -T35 37A, 43 

C4/820 Dynamo Drive Belt -T35 37A, 43 

C5A 

Radiator Badge - Round Dot 

C5B 

Radiator Badge - Square Dot 

C6 

Patent Plate for dash, brass, black 

enamel on etching 

C7 Mirror and drawing for holder G.P. 

C9 

Brass Disc for end of rear spring cross 

tube, embossed Bugatti 

Touring 

C11 

Replica Repusseau (Boyce sports model 

radiator thermometer: kit of parts including 

ringcasting, thermometer and engraved plate 

with instructions) 

C12 

Hand Operated Air Pump Kit 

C13 

Spare Wheel ‘Bull Ring’ 

C16 

Garage Wallplate - Replica of Molsheim original 

with Bugatti in correct colours and style 

C17 

Official B.O.C. Colour Card. 

C20 Purolator Oil Filter Element. Various 

C21 Walnut Knob for hand brake lever G.P. 

C22A 

Tool Holders, GP Spare Wheel, 330mm 

Brake Drum 

C22B 

Tool Holders, GP Spare Wheel, 270mm 

Brake Drum 

C24A Pressure Gauge Huile, 2kg G.P. 

C24B Pressure Gauge, Essence calibration G.P. 

C25 

Hand Operated Oil Transfer Pump Kit 

C31A 

Headlamp Bulb, 12v double contact 

C31B 

Headlamp Bulb, 12v single contact 

C31C Headlamp Bulb, Halogen, 12v 40/45W 

C31D 

Headlamp Bulb, (Yellow) 12v single contact. 

C31E 

Festoon Bulb, 12v, 18w, 15mm x 44mm 

C31F 

Headlamp Bulb, Halogen-12v 50w 

C32A 

Grease nipple - aluminium - No Longer Stocked 

C32B 

Grease nipple - brass 

C34 

Windscreen Frame with apron strip, 

screws and 

G.P. 

C34A Windscreen glass G.P. 

C35C Shock Absorber Drum G.P. 

C40C 

Tab Washer for shackle pins 

C42A Ignition Tube. High voltage resin coated, with 35, 43 

C42B Ignition Tube. (Small diameter). 37, 40 

C45 Bonnet Hinge Various 

C53 Brass Plug for cambox Various 

11

C53 Brass Plug for cambox Various 

C55A/8 Oil Union Banjo, 7mm Bolt, 8mm Feed Pipe 

C55B/6 Oil Union Banjo, 9mm Bolt, 6mm Feed Pipe 

C55B/9 Oil Union Banjo, 9mm Bolt, 8mm Feed Pipe 

C55C/12 Oil Union Banjo, 16mm Bolt, 12mm Feed Pipe 

C55C/16 Oil Union Banjo, 16mm Bolt, 16mm Feed Pipe 

C57 Grand Locking Plate T37/37A/40 

Other Miscellaneous Items Normally Stocked 

M1 

Beru spark plug terminals 

M2 

Beru hose clips 

M3 

Throttle ball joint, G.P. 

M4 

Eyelets for body screws 

M5/A6 Sparking Plug 



M6 

Spring clip cover 

M7 

Drain tap 

M8 Wax Filled Thermostat T57 

M9 Thermometer Bulb As Supplied in C11 Kit 

M10 Silent Bloc Bush Touring 

M11 Throttle Ball Joints T44/49 

M12 Wiring Grommet for Dash Several 

M13 Bulkhead Wiring Grommet T57 

10. leather Items 

Leather Discs 

C1A 

C1B 

C1C 

Steering Column, 110 x 10.4 holes on 95 p.c.d.- 

Steering Column Leather disc 

Blower Coupling, 105 x 40 x 12, 8 holes 

Leather Links 

C2A S/Abs. & Torque Arm Leather Link G.P. 

C2B S/Abs. Leather Link Brescia 

C2C 

Torque Arm Leather Link, 60mm centres, 

16mm 

Various Touring 

C2D Shock Absorber Leather Link, 120mm centres. Brescia 

C2E Torque Arm Leather Link, 110mm centres.(T57) 57 

12

11. Washers And Gaskets 

C3A 

Copper Washer for 7mm union. 

C3B 

Copper Washer (folded) for 9mm unions. 

C3B-ALUM Alum Washers for 9mm Oil Unions (SEE C3P) 

C3C 


C3D Copper Clad Exhaust Flange Joint. 30, 25, 37, 40, 43, 44 etc. 

C3L 

Copper Clad Exhaust Flange Joint, 

for 52mm dia. 

C3A 

Copper Washer for 7mm union. 

C3B 


C3B-ALUM Alum Washers for 9mm Oil Unions (SEE C3P) 

C3C 


C3D Copper Clad Exhaust Flange Joint. 30, 25, 37, 40, 43, 44 etc. 

C3E/E Gasket, Exhaust Manifold. 35, 43 

C3E/I Gasket, Inlet Manifold. 35, 45 

C3F/E Gasket, Exhaust Manifold 35, 46 

C3F/I 

Gasket, Inlet Manifold. 

C3G/E Gasket, Exhaust Manifold- Copper Clad - T57 57 

C3G/I Gasket, Inlet Manifold. 57 

C3H 

Water manifold, rubber seal, 

C3J Copper Clad Exhaust flange Joint 57 

C3K Felt Washers for rear axle. Sets of 8 per axle T30-55 

12. Tools 

A few, difficult to find tools, are stocked for Members’ convenience 

Taps and Dies for Bugatti special threads. 

T1 

T2 

T3 

T4 

T5 

T6 

T7 

T8 

T9 

T10 

T11 

T12 

T13 

T14 

T15 

T16 

T17 

T18 

T19 

T20 

T21A 

T21B 

5mmx0.75 Tap 

7mmx1.0 Tap 

9mmx1.25 Tap 

11mmx1.25 Tap 

5mmx0.75 Die 

7mmx1.0 Die 

9mmx1.25 Die 

11mmx1.25 Die 

5mm Body Drill 

7mm Body Drill 

See T11/5:T11/6:T11/8:T11/A. 

See T12/5:T12/6:T12/8. 

Peg Spanner for brass plugs on cambox 

Tool for body screws 

Oil Union Spanner 

HUB PULLER small 

HUB PULLER large 

18mm plug spanner 

Valve spring compressor 

Grease Gun, Wanner type, for hexagonal nipples 

Bugatti Vice, large type, Exact replica of works 

Bugatti Vice, small type. Exact replica of works 

13

13. Fasteners 

Plain Nuts 

B1A 

B1B 

B1C 

B1D 

B1E 

B1F 

5 x 0.75 8 Hex - plain nut 

7 x 1 10 Hex, H.T.-plain nut 

9 x 1.25 13 Hex plain nut 

11 x 1.25 16 Hex - plain nut 

9 x 1 13 Hex, H.T.- plain nut 

14 x 1 25 20 Hex,.- plain nut 

Castellated Nuts 

B2A 

B2B 

B2C 

B2D 

B2E 

B2F 

7 x 1 10 Hex - castle nut 

9 x 1.25 13 Hex - castle nut 




M6 x 1, 9 Hex Castle Nut (For Steering Taper 

Brass Nuts 

B6A 

B6B 

7 x 1 10 Hex (Exhaust) - brass nut 

9 x 1.25 13 Hex - brass nut (Cambox) 

Fasteners 

B3A 

5 x 0.75(Countersunk square head 13 long) bolt 

B3B 

5 x 0.75 Square Head 20 long - bolt 

B3C 

5 x 0.75 Body Screw 

B3E 

5 x 0.75 Square Head 50 long - bolt 

B3F 

5 x 0.75 Countersunk Screw 18 long - bolt 

B3G 

5.x 0.75 Countersunk Square Head 22 long - bolt 

B3H 

5 x 0.75 Square Head 13 long bolt 

B3J 5 x 0.75 Countersunk Square Head, stainless, 13 

6x1 

B3AA 

B3D 

B4N 

B4P 

6 x 1 Countersunk Square Head 13 long - bolt 

6 x 1 Body Screw 

6 x 1 Countersunk Slotted Wheel Screw 

6 x 1 Countersunk Square Head Wheel Screw 

14

7x1 

B4A23 

B4A30 

B4A43 

B4A55 

B4F 

B4G 

B4H 

B4Q 

B4S 

B4J 

B4K 

B4U 

B6C 

B6F 

B6J 

7 x 1 Square Head 23 long 




7 x 1 10mm Hex 35 long 

7 x 1 9mm Hex 20 long (Shock absorber) 

7 x 1 Stepped Slotted Head long (Steering coupling) 

7 x 1 Countersunk Slotted Head screw 20 long 

7 x 1 12mm Hex 20 long (Brake backplate) 

7 x 1 10mm Hex 118 long (Cambox) 

7 x 1 10mm Hex 118 long with threaded extension 

7 x 12 long inter block bolt 

Cambox centering screw 

7 x 1 Semi-finished Stud 50 long 

7mm x 35cm long steel bar. 

9x1 

B4M 

9 x 1 Big end bolt with slotted nut 

9x1.25 

B4B30 

B4B50 

B4B65 

B4BB100 

B6D 

9 x 1.25 Square Head 30 long 

9 x 1.25 Square Head 50 long 

9 x 1.25Square Head 65 long 

9x1.25 Square head, high tensile 100 long 

9mm Rocker screw 

11x1.25 

B4D 

B4E 

B4R 

B4T 

11x1.25 Square Head 105 long. 

11x1.25 Square Head 50 long. 

11 x 1.25 16mm Hex 55 long (Prop shaft) 

11 x 1.25 Countersunk slotted head screw 30 long 

Oil Union Bolts 

B5A 

B5B 

B5C 

B5D 

B5E 

7 x 1 10 Hex 20 long - oil union bolt 

9 x 1.25 6 Hole Knurled Head 40 long - oil union 

9 x 1.25 6 Hole Knurled Head 52 long - oil union 

9 x 1.25 6 Hole 7 x 1 Tapped Head 40 long - oil 

16 x 1.25 Hex 32 long - oil union bolt 

Cotter Pins 

B6E 

B6G 

B6H 

10mm 7 x 1 thread cotter pin (Brake lever) 

9mm 5 x 0.75 thread cotter pin (Camshaft bevel) 

9mm 7 x 1 thread cotter pin (Vertical drive) 

15

15. Castings Numerical list 

Material: Unless otherwise stated parts are cast in good commercial 

quality aluminium or bronze as appropriate 

Stock Code Description Model 

A1A Water Pump Body. 35, 43 

A1B Water Pump Body. 51, 55 

A1C 

Water Pump Body 

A2 Water Pump Body, Large blown T37A. 37A 

A3 Water Pump, Outer Cover 30, 35, 37A, 43, 44, 46 

A3C 

Water Pump, Outer Cover 

A4 Water Pipe, front. 37A 

A5 Impeller, water pump, large LH spiral 30, 35, 43, 46, 51, 55 

A5C 

Impeller, Water Pump,75mm dia. 

A6 Impeller, water pump, large RH spiral 37A, 44 

A7 

Water Manifold, right side of engine, 

large inlet 

37A 

A8 Oil Filler Cap, not lettered Several 

A9 Water Elbow on cambox 30, 35, 37A, 43, 44,49 

A10 Magneto Cradle on dash 35, 37A, 43, 51, 55 

A11 Hub End Cover, small 35A, 37, 40, 44, 49 

A12 Hub End Cover, large 35, 43, 51, 55 

A13 Crankcase Breather Elbow 37, 40 

A14 Cap for Crankcase Breather (item 13) 

A15 Tacho Pulley 35, 37A, 43, 51 

A16 Nose Piece on Blower Drive Casing (bronze) 35B, 35C, 37A, 51 

A17 Step Up Gear Housing, rear of cambox 35, 43 

A18 Inlet Manifold, Y-piece for blown engine 35B, 35C, 43 

A19 Safety Valve Cap, for item 18 

(and 37A Manifold) 

35B, 35C, 43, 37A 

A20 Blower Drive Housing, rear casing 35B, 35C, 37A, 43, 51, 55 

A21A Front Cover for Blower Housing A20 35B, 35C, 37A, 51 

A21B Front Cover for Blower Housing A20, 

G.P. models 43, 55 

A22 

Blower Casing 

A23 Gear Lever Gate, stainless steel casting 35, 37, 51, 30, late Brescia 

A24A Bronze cap without greaser boss 

A24B Bronze cap with greaser boss 

A25 Gearbox Casing, G.P. 35, 37, 51 

A26 Gearbox Lid for item 25, 130 35, 37, 51, 30, late Brescia 

A27 Front Cover for item 25 35, 37, 51, 30, late Brescia 

A28 Layshaft End Cover for item 25 35, 37, 51, 30, late Brescia 

A29 Selector Box Housing for rear of item 25 

(bronze) 

35, 37, 51, 30, late Brescia 

A30 Top Cover for item 29 (bronze) 35, 37, 51, 30, late Brescia 

A31 

Front Cover for selector rods and spring 

detents 

35, 37, 51, 30, late Brescia 

A32 

Brake shoe ring, makes 2, aluminium, 

for 330mm 

Several 

16

A33 Tank Cap, eared, G.P. 35, 37, 51 

A34 Gearbox Top with provision for starter motor 35, 37 

A36 Inlet Manifold above Blower 51, 55 

A37 Safety Valve Housing for A36 51, 55 

A38A Steering Extension Bracket (cast iron) 37A 

A38B Steering Extension Bracket (cast iron) 35B, 35C, 51 

A39 

Water pipe, lower to radiator 

(T57 solid engine) 57 

A40 Fuel tank collar, G.P. (bronze) 35, 37, 51 

A41 Fuel Tank Saddle Pieces, G.P. (bronze) 35, 37, 51 

A42A Front Spring, Rear hanger, RH for G.P. 35, 37, 51 

A42B Front Spring, Rear hanger, LH for G.P. 35, 37, 51 

A44 

Clutch Tray below flywheel 

(larger radius than 35) 

37, 37A 

A45 Brake Pedal Pad 35, 37, 51 

A46 Bronze Pivot for A-R Lever 35, 37A, 43 

A47 

Bracket, Aluminium, short, for A-R 

mechanism. 35, 43 

A48 

Bracket, Aluminium, long, for A-R 

mechanism. 

37A 

A49 Distance Block, rear shock absorber 35, 37, 51 

A50 Steering Column Bracket on dash, G.P. 35, 37, 51 

A55 Dynamo Cradle, at front of Crankcase 37 

A56 Air Pump Drive Housing 35A, 37 

A58 Magneto Cradle, twin type, on dash Brescia 

A59 Tank Cap, not eared, aluminium alloy 35, 37, 51 

A60 Radiator Cap, for 65mm thread (not T57) 

(bronze) 

Most cars 

A61 Boyce Ring casting (part of C11) 

A62 Pump handle (part of C12) 

A63 Pump End Flange (part of C12) 

A64 Back Plate for rear brakes 35, 43, 51 

A70 Steering Box Housing 35, 37, 51 

A71 End Cover for A70 35, 37, 51 


A73 Water Gallery Manifold, on block 57 

A74 Clutch Yoke Swinging Block 35, 37, 51 

A75 Water Pump Body, small pump. 37, 40 

A76 Outer Cover for small pump A75, 

aluminium alloy 37, 40 

A76A Outer Cover for small pump A75, (bronze) Brescia 

A77 Impeller, water pump, small aluminium alloy 37, 40 

A77A Impeller, water pump, small (bronze) Brescia 

A77B Impeller, Water Pump, Small Bronze 

A78 Bonnet (hood) Hinge Bracket (bronze) Several 

A79 Cover for Vertical Drive, front of block 37, 40 


A81 Dynamo Cradle on dash, G.P. 35, 37 

A82 Brake Pedal Pad Touring cars 

A83 Clutch yoke swinging block 44, 49 

A84A Water Elbow on cambox, RH 37, 40 

17

A84B Water Elbow on cambox, LH 37, 40 

A85 Clutch Yoke Trunnion, early cars (bronze) Brescia 

A86 Cambox lid for A126 30, 35, 38, 43 

A87 Clutch Tray below flywheel 35, 51 

A88 Water Manifold, left side of engine 44 

A89 

Brake Shoe, double, cast iron, machines 

to two 

35A, 37, 40, Brescia 

A89A Brake Shoe, double, aluminium, machines 

to two 

A90 

Piston 

A91 Water Pipe, front of engine 35 

A92A Front Spring, rear hanger, RH Touring cars 

A92B Front Spring, rear hanger, LH. Touring cars 

A93 Cover for A92. Touring cars 

A95 Water Pump Body (57 MOT 10) 57 

A96 Outer Cover for A95 57 

A97 Cambox Lid (4 cylinder) 37, 41 

A98 Oil Filler Elbow 40 

A99 Air Pump Body (bronze), remove one boss 35, 37 

A100 Water Pipe, front of engine, early type 35 

A101 Jacking Wedge, rear axle 35, 51 

A102 Water Manifold, long RH side of engine 30, 35, 38, 43 

A103 Inlet Manifold, on block (pairs) 30, 35, 38, 43 

A103A Water Inlet Manifold (narrow radiator) 35A 

A104 Accelerator Lever pivot Blocks 35, 37, 43 

A105 Front Engine Cover 35 

A106 Ignition Tube Support (on manifold) 35, 43 

A107 3-way Air Valve Body (bronze) 43 

A108 Manifold Adaptor, twin 30 Solex to block 37, 40, Brescia 

A108A Manifold Adaptor, 35 Solex to block 37, 40, Brescia 

A110 Steering Box Distance Block 44 

A111 

Bonnet (hood) catch, Body casting 

A113 

Oil transfer pump body. 

A118 Water Pump Body (late type) 44 


A121 Jacking Pad on rear axle Touring 

A122 Gearbox Filler Nut (to be threaded 50 x 1.5p) 35, 37, 51, 30, late Brescia 

A123 Clutch Cover (bronze) Brescia 

A124 

Switch lever 

A126 Cambox Casing, less bushes 30, 35, 38, 43 

A127 

Water Pump Body (bronze) 

A128 Brake Drum Fin Ring Casting, large brakes 44, 49, some 37 

A129 Crankcase top 37, 37A, 40 

A130 Gearbox case. Brescia 

A131 Inlet Manifold, single carburettor 37 


A133 

End Cover, heat treated for touring 

steering box 

Touring 

A134A Crankcase bearer arm, r/h. 

A134B Crankcase bearer arm, l/h. 

18

A136A Dash bracket RH 

A136B Dash bracket LH 

A137 King pin Pulley Swivel/cover Several 

A138 Counterpiece for A102 30, 35, 38, 43 

A139 Oil Pump Body 35, 38, 43, 51 

A140 

Cover for A139, A142 


A142 Oil Pump Body 37, 40 

A143 Thrust Collar, rear axle, H/T bronze Several 

A144 Oil Pump Body Brescia 

A145 Ignition Tube Support (on manifold) 37 

A146 Water Manifold, cranked end 37, 40 

A147 Oil Level Cover, R.H. side, square 35, 37, 43 

A148 Cambox Casting, less bushes 37, 40 

A149 Inlet Manifold, later long type Brescia 

A150 Oil Pipe Take-off Fitting (bronze) 35, 37, 43 

A151 Bearing Cap rear 37, 40 

A152 Bearing Cap front (bronze) 37,40 

A153 Sliding Lever Yoke (bronze) Several 

A154 Adjusting Nut (bronze) Several 

A155 Oil level float casing. Various 

A156 Oil Pump/Water Pump Drive Housing 44 

A157 Oil Pump Body 44 

A158 Cover for A157 44 

A159 Relief Valve Cover 44 

A160 Bearing Cap centre 37, 40 

A161 

Oil Filter Housing Casting. 

A162 Filter Base Casting 35 

A163 Brescia Water Pipe ( Inlet ) 

A164 Brescia Water Pipe (Outlet ) 

A165 

Brescia Dumb Iron castings 

A166 

Brescia Rear Axle Castings (pair) 

A167 

Aluminium Footplate 

A168A T35 Bulkhead Support Bracket L/H 

A168B T35 Bulkhead Support Bracket R/H 

A170 

Solex Carburettor Lever 

A171 Throttle Pedal Lever - Bronze Most Types 

A172 Block Tap Elbow T35/43 & Others 

A173 Crank Nut Locking Ring T35/43 & Others 

A174 Starting Handle Grip - Aluminium Most Types 

A175 

Marchal Dynamo Cover 100mm - Aluminium 

A176 Advance/Retard Lever 40 

A177 Marchal Switch Levers Various 

19

Bugatti Steels 

Apart from normal mild or medium carbon steels, Bugatti used widely on shafts, axles, and gears good quality 

low carbon nickel chrome based hardening steels, often not case hardened. Such parts are usually stamped 

with the maker's reference number. 


AD3 

(Aubert & Duval) 

Carbon 0.12% max. 

Nickel 3-3.5% 

Chrome 0.5 - 1% 

Modern equivalent SAE 3310, En 36B Typical strength 120,000 p.s.i., 55 

tons sq. in., 85kg mm_ Case when hardened, Diamond hardness 700, 

Rockwell61C 

NCAV (Aubert & Duval) as AD3 with rather more caron, approaching 

MH2 (Marine) 140,000p.s.i. 65 tons sq in., 100kg mm2 

CR-X 

(Holtzer) 

897 (Aubert & Duval) 

JC2 

3% Ni. C - H steel 

Case depths quoted on drawings are generally 0.8-1mm(.03-04 inches) before grinding. For valve caps do not 

exceed 0.25-0.3mm (-.010 - 012in) preferably by cyanide hardening. 

Tyre gearing 

Modern Types 

Turns per mile 

6.00 x 19 660 

Racing 680 

5.00 x 19 648 

Racing 677 

6.00/6.50 x 20 710 

5.50/5.25 x 19 728 

5.00/4.75 x 19 744 

4.50 x 19 700 

4.00 x 19 735 

5.50 x 18 

720 x 90 B.E. 

Lubrication Recommendations 

Engine: Roller bearing types Castrol R40 

Other 

Castrol GP50 

Any "straight" 40 

(Modern SAE 20-50 oils are less suitable for single-cam engines, in the opinion of some experienced owners) 

Gearbox: EP 90 

Rear Axle: EP140 

Steering box: EP 140 

Water pump: Heavy industrial grease, such as Mobil AA (not soft lithium-based chassis 

grease). 

20

Bugatti Screw Threads 

Dia x pitch (millimetres) 

Usual Use Occasional Use Type of Thread 

4 x 0.75 Old French standard 

5 x 0.75 Old French standard 

6 x 1 S.I. 

7 x 1 S.I. 

8 x 1.25 S.I. 

9 x 1 e.g. conn. rod bolts 

9 x 1.25 S.I. 

10 x 1 pipe threads 

10 x 1.5 

11 x 1.25 

12 x 1.25 pipe threads 

12 x 1.5 

14 x 1.25 S.I. spark plug 

15 x 1.5 Early Brescia pipe fittings 

16 x 1.25 

18 x 1.5 S.I. spark plug 

20 x 1.5 

Any mm diameter, usually 1.5 pitch, coarser on radiator cap etc 

N.B. Early 16 valve cars used Whitworth gas threads, e.g. 1/4 gas, 0.518 in x 19 

Torques 

Suggested torques for standard Bugatti nuts, based on experience. 

Normal 

Maximum 

5mm 4 lb. ft. 6 lb. ft. 

6mm 6 9 

7mm 8 13 

9mm 20 30 

11mm 33 56 

(1 lb. ft. = 0.14 m.k.g.) 

21

HIA 

HID 

HIB 

HIE 

HIC 

HIF 

Also Available from Bugatti Trust 

C15B 

B4U 

C40B 

22

57 EA 87 

A32 

A64 

A128 

A11 

A121 

A12 

A101 

C39 

A83 

23

T12 

T11 

T15 

(See T1-T4) 

T13 

C 43G 

C3A 

C3B 

C3D 

C3C 

C3E/I 

C3E/E 

C3F/I 

C3F/E 

C3G/I 

C3G/E 

24

C10A 

C10B 

C10C 

C3H 

C3J 

C3K 

C3L 

25

T3 

T5 

T6 

T2 

T1 

T7 

T8 

T9 

T10 

T4 

A44 

(A87 

Similar) 

A154 

A153 

A85 

26

46MOT93 

57AC53 

57MOT317 

57MOT318 

A38A 

A110 

A38B 

A133 

A70 

A71 

A137 

27

B 4A55 

B 4A43 

B 4A30 

B 4A23 

B 4F 

B 4G 

B 4S 

B 4H 

B 4Q 

B 4J 

B 4K 

B 4BB100 

10mm B 6C 

11mm B 6C 

B 6F 

C 41 

B 4B65 

B 4B50 

B 4B30 

B 6D 

B 4M 

37MOT60 

28

C24A 

C24B 

6208 

98209 

4207 

98202 

29

C8 

Piston 

Blank 

T17 

T16 

30

C39C 

C39B 

C39A 

B 4D 

B 4E 

B 4R 

B 5C 

B 5B 

B 5A 

B 4T 

B 5D 

B 5E 

B 6E 

B 6G 

31

B 1A 

B 1B 

B 1C 

B 1E 

B 1D 

B 2A 

B 2B 

B 2C 

B 6A 

B 2E 

B 2D 

B 6B 

B 3B 

B 3G 

B 3A 

B 3E 

B 3F 

B 3C 

B 3J 

B 3H 

B 3D 

B 3AA 

B 4P 

B 4N 

32

A33 

A40 

A41 

A59 

A60 

C3A 

M1 

M4 

C42C 

M5 

M6 

M2 

M7 

33

C16 

C42A 

C45 

C42B 

C34A 

C34 

F1 

F2B 

F1B 

F6 

F7A 

F7B 

F3 

F4 

F5 

F13 

F8 

34

G4A 

G5A 

G5B 

G5C 

G5D 

G5E 

G4B 

G3C 

G3B 

G3A 

G2-4I 

G2-3E 

G2-4E 

G2-7 

G2-3I 

35

A89 

64EA1 

57PA140 

57PA141 

C1A 

C1C 

C1B 

C2B 

C2A 

C2C 

C2D 

C2E 

36

C7 

C11 (Kit*) 

C5 

C21 

C9 

C6 

*This Includes Holder Casting ‘A61’ and Thermometer Bulb’M9’, also the ‘Nameplate’ as Shown 

C31E 

C32A 

C31A 

C32B 

C20 

C53 

37

C4 

C36 

38

G1-4I 

G1-3E 

G1-2 

G1-3AI 

G1-4E 

G1-7 

G1-3I 

A92B 

A92A 

A42 

A47 

A58 

A15 

A104 

A49 

A10 

A93 

A50 

A81 

A78 

39

C35A 

C35B 

C44 

C23 

C47 

C48 

C49 

C40A 

C50 

C46 

A26 

A25 

A27 

A34 

A28 

A30 

C33 

A29 

A122 

A31 

A23 

40

57AC21/22 

57AC17 

57AC18 

A84A 

A84B 

57AC19 

57AC20 

A138 

A10D 

A7 

A88 

A72 

A73 

A80 

41

A86 

A126 

A148 

A97 

A79 

A17 

A56 

A9 

A99 

A129 

A151 

A55 

A13 

A120 

A141 

A105 

A150 

A98 

A155 

A8 

A147 

42

A139 

A142 

A140 

A156 

A144 

A158 

A131 

A108 

A108A 

A103 

A18 

A36 

A19 

A145 

A37 

A106 

43

A1A 

A1B 

A2 

A75 

A95 

A118 

A127 

A3 

A96 

A76 

A5 

A6 

A76A 

A77 

A77A 

A21A 

A21B 

44

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