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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

 

ADJUSTING FUEL TIMING

Steps necessary for fuel timing:

1. Remove air intake manifold so that the fuel injector pump can be removed without interference.

2. Set throttle lever at full speed.

3. Remove injector pump side cover. This will enable you to visually check to insure that the fuel rack pin inside the pump properly aligns with the opening in the top of pump housing when being removed to prevent binding or shearing of the pin. This pin is critical to proper pump operation and if damaged will require replacement of the complete pump.

4. The injector pump internal unit can now be loosened and removed. It may be necessary to remove fuel lines from injector nozzles to aid in pump removal

5. There are several shims located just below the pump top plate which will be used to adjust the timing. These shims are .006 inch thick and are equal to 1- or approximately 3116" of distance on the circumference of the flywheel. Addition of shims will retard the timing and removing shims will advance the timing.

6. If the mark on the flywheel is below the pointer, the fuel is being injected sooner than required and the fuel timing must be retarded. Shims must be added until the timing marks are aligned. The opposite is true if the flywheel mark is above the pointer. See image to the right.

7. If at all possible, it is better to operate the engine with the timing advance rather than retarded.

8. Replace fuel injector pump, making sure the fuel rack pin aligns with the housing opening and is properly inserted into the slotted arm. Tighten injector pump cover in place. Reconnect fuel line from fuel filter to pump. Repeat steps 2 thru 12 on engine timing.

9. If timing is satisfactory, then reassemble. Be certain that all plates, covers, fuel lines and connections are tight and free of leaks so that safe operation may be expected when the engine is started. Clean engine thoroughly.

10. Caution: Be sure all fuel lines and connections are kept clean during adjusting, to prevent fouling of nozzles when reassembled.