Operator`s manual
W 38B FOUR MARINE DIESEL ENGINE 
Engine Type 
Governor 
Valve Mechanism 
Combustion Chamber 
Bore & 
Stroke 
Piston Displacement 
Firing 
Order 
Direction of Rotation 
Maximum Torque (at 
2400 rpm) 
Compression Ratio 
Compression Pressure 
Valve Seat Angle 
Valve Clearance 
(engine cold) 
Dimensions 
Inclination 
Dry Weight 
Fuel Consumption 
Idle Speed 
Cruise 
RPM 
GENERAL SPECIFICATIONS 
Diesel, four-cycle, 
four-cylinder, fresh water-cooled, 
vertical, in-line 
(37 
hp 
at 3600 rpm, maximum) 
Mechanical, centrifugal weight type 
Overhead 
Swirl chamber type 
2.87 x 
3.07 inches 
(73 
x 78 mm) 
79.64 cubic inches 
(1.305 liters) 
1-3-2-4 
Clockwise, when viewed from the front 
53 
Ibs-ft (7.33 kgs-m) 
23:1 
455 psi 
(32 
kgJcm
2
) 
at 320 rpm 
Intake 
45' 
Exhaust 
45' 
Intake 0.0098 inches (0.25 mm) 
Exhaust 
0.0098 inches (0.25 mm) 
Height: 
23.70 inches (601.98 mm) 
Width: 18.37 inches (466.60 mm) Max. 
Length: 33.77 inches (857.76 mm) 
Continuous 
14' 
Temporary 
25' 
(not 
to 
exceed 30 min.) 
4191bs (190 kgs) 
0.42 U.S. gph (1.59 Iph)  running at 
2500 rpm (approximate) 
750 - 950 rpm 
2500 - 3000 rpm 
15 
Westerbeke 
Diesel 
Engines 










