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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

 

SEA WATER PUMP:

Your engine is equipped with a rubber impeller type sea water pump.

CAUTION: DO NOT RUN PUMP DRY AT ANY TIME OR YOU WILL DAMAGE THE IMPELLER, CAUSING ENGINE TO OVERHEAT.

You can use methyl alcohol based anti-freeze compounds such as Zerex, Shell Zone, Pyro Permanent, Permagard and Dowgard.

REPLACEMENT OF SEA WATER PUMP IMPELLER:

1. Be sure engine is stopped. Turn off sea water inlet valve.

2. Loosen and remove the pump cover screws.

3. Tap cover on side to loosen, being careful not to damage cover gasket and remove cover.

4. At this time be careful not to pull the pump shaft forward or Out of its present position. If the shaft does come forward during the changing of impeller, it will be necessary to remove complete pump.

5. Remove the snap ring located on the end of shaft in center of impeller, with shaft held in place.

6. The impeller can now be pulled off the pump shaft. Be sure to hold shaft in place with a screwdriver or etc., when removing the impeller.

7. Replace with the new impeller by rotating. (You can lubricate impeller with Vaseline or oil prior to installing.) This will also prevent burning of new impeller when first starting engine.

8. Replace snap ring, being sure it is in the groove all the way around.

9. Replace gasket and cover (oil inside of cover).

10. Replace the cover screws and tighten evenly.

11. Open sea water inlet valve, check for leaks.

12. Engine can now be started, check engine temperature.

NOTE: IF DURING IMPELLER REPLACEMENT THE PUMP SHAFT CAME FORWARD, IT COULD HAVE COME OUT OF THE GROOVE AND DRIVE ADAPTOR. IF SO, YOU MUST COMPLETE THE FOLLOWING. NOTE - ON NEWER UNITS WITHOUT A MOUNTING SPACER BETWEEN THE PUMP AND ENGINE BLOCK YOU DO NOT HAVE A DRIVE ADAPTOR TO BE CONCERNED ABOUT. HOWEVER, YOU MUST ALIGN THE SHAFT TANG AND THE DRIVE
GROOVE WHEN REINSTALLING THE PROPELLER SHAFT.

1. Loosen and remove the two capscrews holding the pump body to engine.

2. Slowly move pump away from engine as the adaptor will come out.

3. Complete the replacement of impeller as noted above.

4. The pump shaft will now be protruding through the body mounting flange.

5. - Place the adaptor on to the pump shaft aligning the pin on the groove. On later models this may not be present, the pump may mount direct to engine block.

6. Align the slot on the other side of adaptor with the drive shaft in engine and place pump on engine.

7. Hold in place and start the two mounting capscrews. TIGHTEN FINGER TIGHT SO PUMP IS FREE TO MOVE AND ALIGN ITSELF. ON 1987 MODELS THE PUMP HAS A PILOT FOR SELF ALIGNING, JUST MOUNT AND TIGHTEN.

8. Open sea water valve and start engine at idle. This will align pump to the drive and adaptor.

9. Stop engine - now tighten capscrews carefully.

CAUTION: BE VERY CAREFUL DUE TO V-BELT MOVING ON FRONT OF ENGINE.

10. Feel the bearings to make sure they are not hot; they are located in the center of pump body.
11. Alignment of pump can also be accomplished by turning engine over with the starter while decompression lever is in the open position, approximately 5 to 10 revolutions. Release starter button and decompression lever - tighten water pump screws.

NOTE: THERE ARE TWO TYPES OF SEA WATER-RUBBER IMPELLER PUMPS USED. ORBERDORFER PUMP HAS 4 SCREWS SECURING COVER TO PUMP BODY AND SHERWOOD PUMP WHICH HAS 6 SCREWS SECURING COVER TO PUMP BODY. NOTE WHICH PUMP YOU HAVE ON COVER OF THIS MANUAL. IT IS RECOMMENDED TO HAVE A SPARE IMPELLER AND COVER GASKET ON BOARD AT ALL TIMES.


ORBERDORFER IMPELLER NO. 295628
COVER GASKET NO. 295626

SHERWOOD IMPELLER NO. 287439
COVER GASKET NO. 295745

CAUTION: DO NOT RUN PUMPS DRY OR WITH SEA INLET VALVE CLOSED. LACK OF WATER WILL CAUSE EXCESSIVE HEAT BUILD UP DAMAGING OR DESTROYING THE RUBBER IMPELLER, AND ENGINE WILL OVERHEAT.

IF VANES COME OFF IMPELLER THEY MUST BE LOCATED AND REMOVED TO INSURE THEY ARE NOT BLOCKING OR RESTRICTING THE COOLING WATER FLOW IN THE ENGINE, HOSES, OR FITTINGS.

NEW STYLE PUMPS HAVE A PILOT AND CAN BE MOUNTED AND BOLTED TIGHT WITHOUT TURNING THE ENGINE OVER.