SeaStar steering dimensions

SeaStar steering dimensions 

Helms: 

BayStar 

HYDRAULIC STEERING dimensions 

SeaStar & 

SeaStar PRO 

Front Mount 

SeaStar 

Rear Mount 

FILLER PORT 

4-7/16" 

(113mm) 

3/4" STANDARD TAPER 

4-7/16" 

(113mm) 

5/8" UNF 

THREAD 

WOODRUFF KEY 

5-7/8" 

(149mm) 

3-7/8" 

(98mm) 

1-3/4" 

(45mm) 

1-7/8" 

(48mm) 

DASH 

2-5/8" 

(67mm) 

2-5/8" 

(67mm) 

3" Dia. 

(76mm) 

1/4" NPT 

PORTS (4) 

Hynautic 

Rear Mount 

HELM DIMENSIONS SHAFT 

HELM MODEL/ (INCHES) KEY 

SERIES PART NO. A B C TYPE 

H-20 H-21 6.125 10.75 3.5 1/4” square 

H-25 5.5 10.125 3.5 #9 Woodruff 

H-26 5.5 10.125 3.5 #9 Woodruff 

H-40 H-41 6.125 13.625 5.125 1/4” square 

H-41-02 5.5 13.0 5.125 #9 Woodruff 

H-41 6.125 13.625 5.125 1/4” square 

H-42-02 5.5 13.0 5.125 #9 Woodruff 

Capilano 

3/8" DIA.(9.5mm) 

MOUNTING HOLES 

30 

DEG. 

3/8" NPT 

3/8" NPT (DELIVERY LINE) 


WOODRUFF KEY 

3-3/8" 

(86mm) 

5/8" UNF 

THREAD 

3-3/8" 

(86mm) 

2-1/4" 

(57mm) 

3/4" 

DIA. 

ADJUSTING 

3/8" NPT 

(COMPENSATING 

LINE) 

5-7/8" 

(149mm) 

KNOB 

4-3/4" 

(121mm) 

5" 

(127mm) 

6-5/8" 

(168mm) 

5-1/2" 

(140mm) 

11-5/8" 

(295mm) 

160 

SeaStar, BayStar & Hynautic Products: 604-270-6899 • www.telefl exmarine.com

dimension information: hydraulic steering helms 

Performance Tilt: 

Traditional Tilt: 

12˚ 

48˚ 12˚ 

12˚ 

12˚ 

4.87 TO 

BOOT 

FACE 

6.54 TO 

SHAFT TIP 

TILT HELM PRO TRU SION 

BEHIND DASH (minus dash 

thick ness): APPROX. 7” 

MAXIMUM STEERING 

WHEEL DIAMETER: 20" 

5.00 

SeaStar Helm 

Mounting Options: 

(for SeaStar front mount helms only) 

4.75 

DIA. 

Round Bezel Kit 

HA5417 

3.00 DIA. 

CUT-OUT 

BEZEL 

FOOTPRINT 

12˚ 

30˚ 12˚ 

12˚ 

18˚ 12˚ 

FILLER PORT 

4.92 TO 

BEZEL 

FACE 

6.79 TO 

SHAFT TIP 


5/8" UNF 

THREAD 

WOODRUFF KEY 

6.81" 

FILLER PORT 

3-3/4" 

(93mm) 

5.28 

BEZEL 

FOOTPRINT 

DASH 

4" 

(102mm) 

5.15 

WIDE 

TILT HELM PRO TRU SION 

BEHIND DASH (minus dash 

thick ness): APPROX. 7” 

MAXIMUM STEERING 

WHEEL DIAMETER: 20" 

CUSTOMER- 

SUPPLIED 

SPACERS 


Square Backplate kit 

HA5418 

Required when retrofitting SeaStar front mount helms into 

dashboard holes from the following steering systems: 

Telefl ex Mechancial steering: Big-T, Safe-T and most other rotary. 

Telefl ex Hydraulic steering: SyTen 

Hynautic Hydraulic steering helms: H-50, H60, H-80, H-300. 

Dash 20° 

Wedge Kit 

HA5419 

WOODRUFF KEY 


5/8" UNF 

THREAD 

FILLER PORT 

(For this con fig u ra tion, 

use Drain Kit HA5408) 

5-7/8" (149mm) 

MINUS DASH 

THICKNESS 

7-3/4" 

(195mm) 

DASH 

SeaStar, BayStar & Hynautic Products: 604-270-6899 • www.telefl exmarine.com 

161



Cylinders: Outboard 

BayStar 

(HC4645, 

HC4647, 

HC4648, 

HC4658) 

SeaStar Pivot Mount (includes PRO & Tournament) 

(HC5345 shown) 

SeaStar Side Mount 

(HC5370) 

1-3/4" 

(38mm) 

BLEED SCREW 

21-3/4" 

(544 mm) 

LINK ARM SUPPLIED BY ENGINE MANUFACTURER 

1-5/16" (33.3mm) 

ACROSS WRENCH 

FLATS 

RETRACTION 

2-5/8" (67 mm) 

1-1/2" 

(38mm) 

3/8" COMPRESSION 

FITTING FOR HOSE 

CONNECTION 

9/16"-24 UNEF THREAD 

13" 

(330mm) 

1-11/16" 

(44mm) 

INTEGRAL BLEEDER FITTING 

LINK ARM SUPPLIED BY ENGINE MANUFACTURER 

3/4" (19mm) 

AT FULL 

RETRACTION 

4-7/8" 

(124 mm) 

9" (228mm) 

AT FULL EXTENSION 

SeaStar Splashwell Mount 

(HC5380) 

TRANSOM 

4" 

(102mm) 

1-1/2" 

(38mm) 

21-5/8" 

(550mm) 

SeaStar 

Catamaran/ 

Pontoon 

(HC5343 & 

HC5374) 

HC5374 

HC5343 

162 


dimension information: hydraulic steering cylinders 

Cylinders: 

Stern Drive (I/O) 

Internal Mount 

STERN DRIVE CYLINDER: 

P/N HC5314 

(MODEL BA150-7ATM) 

Marine Drive Systems ® 

Series 1000 

(Non Power Assisted, TO DATE) 

Volvo ® 275 

(Non Power Assisted TO DATE) 


P/N HC5326 

(MODEL BA150-7EM) 

MerCruiser ® ALPHA I; 

MerCruiser ® BRAVO I & II 

(Non Power Assisted, 1984-DATE) 

OMC ® King Cobra 

(Non Power Assisted; 1986-DATE) 


P/N HC5328 (MODEL 125-8EM) 

BMW ® All Models 

(Power Assisted, TO DATE) 

MerCruiser ® MERCRUISER I 

(Power Assisted TO 1983) 

MerCruiser ® ALPHA I; 

MerCruiser ® BRAVO I & II 

Power Assisted (1984-DATE) 

OMC ® King Cobra 

(Power Assisted 1986-DATE) 

Volvo® 280, 290 

(Power Assisted TO DATE) 

Yamaha ® All Models 

(Power As sist ed 1989-DATE) 



P/N HC5329 

(MODEL 125-8VEM) 

Volvo ® Diesel 

(Power Assisted, TO DATE) 


163


Stern Drive (I/O): 

Internal Mount 



P/N HC5330 

(MODEL BA125-8EMV) 

BMW ® All Models 


MerCruiser ® , MerCruiser I 

(Non Power Assisted, TO 1983) 

Volvo ® 280, 290 & Volvo ® Diesel 



P/N HC5331 

(MODEL 92-VPS) 

Volvo ® All Models 

(Power Assisted, 1992) 


P/N HC5332 

(MODEL 135-7EM) 

Mercruiser ® Alpha 1; 

Mercruiser ® Bravo I, II, III 


Volvo ® 280, 290, Diesel 


NOTE: If engine outdrive is not equipped with 

a torque tab on the underside of the lower 

leg, one must be installed to reduce prop 

torque. 

Heavy Duty 

External Mount 

(Hynautic K-5 

cylinder) 

164 



Cylinders: 

Inboard - Manual 

Aluminum 

DIMENSIONS 

ATM (ALUMINUM BODY) INBOARD CYL IN DERS 

P/N HC5312/HC5313/HC5314 (MODEL BA1__-7ATM): 

MOUNTING CONFIGURATION DIMENSIONS 

ATM (ALUMINUM BODY) INBOARD CYL IN DERS 

P/N HC5312/HC5313/HC5314 (MODEL BA1__-7ATM): 

CYLINDER DIMENSIONS SPECIFIC TO MODEL 

CYLINDER PART BODY SHAFT 

MODEL # DIAMETER DIAMETER 

BA125-7ATM HC5312 1.38" (35mm) 0.50" (12.7mm) 

BA135-7ATM HC5313 1.50" (38mm) 0.625" (15.9mm) 

BA150-7ATM HC5314 1.75" (45mm) 0.625" (15.9mm) 


CYLINDER PART MOUNTING DIMENSIONS 

MODEL # A B C 

BA125-7ATM HC5312 20" (508) 6.5" (165) 8.5" (216) 

BA135-7ATM HC5313 20" (508) 6.5" (165) 8.5" (216) 

BA150-7ATM HC5314 20" (508) 6.5" (165) 8.5" (216) 

(Figures in parenthesis are in millimeters) 

BALL JOINT MOUNT CYLINDERS (K-18/K-19) 

CYL DIMENSIONS 

MODEL A B C D BORE STROKE DISP 

K-18 24.5" (662) 9.31" (237) 11.75" (299) 9.875" (251) 1.25" (32) 7" (178) 6.4 (105.6) 

K-19 28.5" (724) 11.31" (287) 13.75" (350) 11.875" (302) 1.25" (32) 9" (229) 8.3 (135.7) 


165


Cylinders: 



Brass - SeaStar 

DIMENSIONS 

TM (BRASS BODY) INBOARD CYLINDERS 

P/N HC5318/HC5369/HC5319 (MODEL BA1__-7TM): 

CYLINDER DIMENSIONS SPECIFIC TO MODEL 

CYLINDER PART BODY SHAFT 

MODEL # DIAMETER DIAMETER 

BA150-7TM HC5318 1.75" (45mm) 0.625" (15.9mm) 

BA150-9TM HC5369 1.75" (45mm) 0.625" (15.9mm) 

BA175-7TM HC5319 2.00" (51mm) 0.75" (19.0mm) 

MOUNTING CONFIGURATION DIMENSIONS 

TM (BRASS BODY) INBOARD CYLINDERS 

P/N HC5318/HC5369/HC5319 (MODEL BA1__-7TM): 

CYLINDER PART MOUNTING DIMENSIONS 

MODEL # A B C 

BA150-7TM HC5318 21" (534) 8" (204) 10" (254) 

BA175-7TM HC5319 21" (534) 8" (204) 10" (254) 

BA150-9TM HC5369 21" (534) 8" (204) 10" (254) 

(Figures in parenthesis are in millimeters) 

166 



Cylinders: 


Brass - Capilano 

DIMENSIONS & MOUNTING CON FIG U RA TIONS 

CAPILANO (BRASS BODY) INBOARD CYLINDERS 

BALANCED 7” STROKE MODELS 

P/N’s HC5349/HC5350/HC5351/HC5355/HC5356/HC5357 

(MODEL BA___-7TM_): 

TYPICAL CYLINDER STROKE ARC: 

35deg. 

35deg. 

4-1/2" 

(114mm) 

6" 

(152mm) 

4-1/2" 

(114mm) 

6" 

(152mm) 

4-3/4" 

(120mm) 

21" 

(533mm) 

4-3/4" 

(120mm) 

21" 

(533mm) 

34" 

(860mm) 

34" 

(860mm) 

1-9/16" 

(40mm) 

4" 

(101mm) 

1-9/16" 

(40mm) 

4" 

(101mm) 


DIMENSIONS & MOUNTING CON FIG U RA TIONS 

CAPILANO (BRASS BODY) INBOARD CYLINDERS 

BALANCED 11” STROKE MODELS 

P/N’s HC5378/HC5379 

(MODEL BA___-11TM_): 

23" (584mm) 

38" (965mm) 

9" 

(228mm) 

CYLINDER MOUNTING 

FOOT DETAIL - ALL 7" 

STROKE MOD ELS 

CYLINDER ROD END 

CLEVIS DI MEN SIONS 

1-3/4" 

(44mm) 

5" 

(127mm) 

5/18-18 NF 

THREADED 

HOLE 

1-3/4" 

(44.5mm) 5/8" 

(16mm) 

3-1/8" 

(79mm) 


167


Cylinders: 


Brass - Hynautic 


“UNIVERSAL MOUNT” 

MODELS: 

P/N K-8/K-9 

CYL 

DIMENSIONS SAE (metric) 

MODEL A* B* C* BORE STROKE DISPLACEMENT 

K-8 19.74" (502mm) 24.47" (622mm) 27.92" (710mm) 2.5" (64mm) 9.5" (241mm) 39.2 ci (641.9 cc) 

K-9 24.74" (629mm) 31.99" (813mm) 37.92" (350mm) 2.5" (64mm) 14.5" (368mm) 59.8 ci (979.8 cc) 

* Clevis option increases length by .44" (12mm) 

“UNIVERSAL MOUNT” MODEL: P/N K-5-B (SEE STERN DRIVE CYLINDERS, ON PREVIOUS PAGES) 

“FIXED MOUNT” 

MODELS: 

P/N K-22/K-27 

CYL 


MODEL A B BORE STROKE DISPLACEMENT 

K-22 *34.12" (876mm) 13.25" (337mm) 1.5" (38mm) 10" (254mm) 13.3 ci (217.2 cc) 

K-27 *36.75" (934mm) 13.25" (337mm) 1.5" (38mm) 10" (254mm) 13.3 ci (217.2 cc) 

* Dimensions are with the cylinder rod centered 

“PIVOT MOUNT” 

MODEL: 

P/N K-31 

CYL 


MODEL A B BORE STROKE DISPLACEMENT 

K-31 *38.37" (975mm) 14.12" (359mm) 2.0" (51mm) 10" (254mm) 25.4 ci (416.3 cc)* 

Dimensions are with the cylinder rod centered 

168

SeaStar steering dimensions

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