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Caution
General Information
Preparations For Starting
Before Starting
Starting Engine
Engine Break-in and General Running
Stopping the Engine
Decompression Lever
Instrument Panel
Wiring Diagram
Preparing Engine for Storage
Preparing Engine for Spring Service
Fuel Injection Timing
Diesel Valve Timing
Adjusting Fuel Timing
Decompression Device Adjustment
Fuel System
Fuel Bleeding
Oil Filter Change
Sea Water Pump and Impeller Replacement
Model 15 Sea Water Circulation Diagram
Model 12, 18, 20, 25, 25XP, 30, 40 & 50 Water
Fresh Water Circulation Diagram
Hurth Transmission
Periodic Service Chart for Engine
Marine Engine Warranty - Limited

Engine Specifications and Images
(by engine model)

M2-12
M3-20
M4-30
M-25XP
M-35
M-30
M-40
M-50
M-12
M-15
M-18
M-20
M-25

 

 FUEL SYSTEM:

The fuel system utilizes either an electric or mechanical fuel pump, fuel filter, fuel injection pump with injectors and fuel lines. Any fuel not used by the injectors is returned through fuel return lines from the rear most nozzle to the top of the fuel supply tank.

ALL MODELS AFTER 1986 HAVE ELECTRIC FUEL PUMPS

The canister type fuel filter should be changed each season before the engine is placed back in service or more often based on engine usage.
The engine operates on No. 2 diesel fuel only and care should be taken to see that no water or dirt enters the fuel system.

Clean fuel is very important to a smooth, trouble free running engine. Add a fuel additive to prevent algae growth.