check OUT OUr NeW ANTI-cOUNTerFeIT PrOGrAMMe

How to use this catalogue
For each make, the Bore Diameter (column identified as -1- on this page) is the first sorting criteria, starting from the
smallest diameter. Then all others engine details provided in 2, 3 and 4 should be used to identify the correct AE part
numbers. Specific details on each part number are provided for additional information.
ENgiNE dETAiLS
1 Bore Diameter
2 Engine name
3 Cubic capacity
4 Number of cylinders
VALVES VALVES VALVE guidES VALVE SEATS
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
VALVES
5 IN : Inlet EX : Exhaust
6 AE Part Number - AE parts
with * are available until
stock exhausts
7 OE Reference - Listed only
for identification of the
AE part number fitting the
application
8 Dimensions in mm.
Head Ø x Stem Ø x Length
9 Material Specs
10 Seat angle and seat
treatment
11 Tip shape and tip treatment
Valve with deflector
VALVE guidES
12 AE Part Number Refer to (5)
to identify IN or EX fitting
position
AE parts with * are available
until stock exhausts
13 OE Reference Listed only
for identification of the
AE part number fitting the
application
14 Dimensions in mm
Length x Inner Ø x Outer Ø
VALVE SEAT iNSERTS
15 AE Part Number Semi
finished valve seat inserts
are also available from AE.
Details are shown in page
IDX21
VALVE SPRiNgS
16 AE Part Number
S : Single spring
P : Pair
VALVE mATERiAL codES
mA: Alloy steel suitable for inlet
valves.
mB: Single piece martensitic
chrome-silicon alloy steel suitable
for petrol and diesel inlet
valves. Also used for stems in
bimetallic exhaust valves.
mc: Chrome-nickel-silicon alloy
steel.
md: Single piece austenitic
chrome-manganese-nickel steel
for exhaust valves operating under
high stress conditions and
temperature of up to 750°C.
mE: Austenitic chrome-manganese-nickel
steel with additions
of niobium, tungsten and
nitrogen to improve elevated
temperature mechanical properties,
structural stability and its
resistance against overaging
in service. Heavy duty exhaust
valves operating at temperatures
up to 780°C. ME is always
bimetallic with MB stem.
mF: Nimonic nickel based
super alloy with additions of
chromium, cobalt and titanium
for good mechanical strength
and used for valves requiring
resistance to fatigue, erosion
and corrosion as a result of the
combustion process gases.
Developed for service up to
820°C and exhaust valves under
the highest stress. MF is always
bimetallic with MB stem.
mg: Bimetallic valve incorporating
MD head and MB stem
material.
v6 v7
FEATuRE codES
cr: Chrome layer on valve stem
ss: Stellite welded seat
st: Stellite welded tip
ph: Phosphated stem
tu: Tuftrided/Nitrided valve
H: Hardened valve tip
Y: Hardened valve seat
PREFiXES
V: Valve
VAg: Valve guide
VS: Valve seat
VSP: Valve spring
VALVE
SPRiNgS
SuFFiXES
B: Bronze
P: Pair
S: Single
V1/V2: Fully interchangeable/
supersession
NoTE: The dimensions shown in the catalogue do incorporate certain
manufacturing tolerances which could vary from one manufacturer to
another. The dimensions shown in the catalogue should be used as a
rough guidance only as they are also in some cases rounded off to the
nearest whole number.