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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

 

PREPARING ENGINE FOR SPRING SERVICE

Preparation of the engine should include all those items of maintenance necessary to permit satisfactory operation of the engine. A properly serviced engine will give a full season of carefree pleasure. The amount of service needed will be determined by the storage procedure of the previous fall. Refer to the section of the manual covering initial start up of the engine.


LUBRICATION SYSTEM:

1. Drain oil from crankcase using hand sump pump through the dipstick hole or oil drain hose if installed.

2. Install new oil filter.

3. Refill crankcase with recommended grade and amount of engine oil. (Fill to upper or full mark on dipstick). Do not overfill.

4. Be sure filler cap is secure after filling crankcase and that no oil leaks are apparent.


TRANSMISSION:

1. If transmission was completely filled for winter storage, some oil will have to be removed to

attain the correct level in the transmission.

2. Check transmission oil level according to specifications found in this manual.

3. Be sure all plugs are secure and that no leaks are apparent. The drain plug should be
checked regularly. -

CAUTION: DO NOT CROSS THREAD THE DIPSTICK THREADS AS IT MAY REQUIRE HOUSING REPLACEMENT.


SEA WATER COOLING SYSTEM:

1. Remove front cover of pump if system was drained for storage. Inspect rubber impeller, lightly lubricate pump impeller, replace gasket and cover securely when inspection and lubrication have been completed.

2. If impeller is not serviceable, see instructions covering the replacement of the sea water pump impeller in the maintenance section of this manual.


COOLING SYSTEM: Model M-15
On Model 15, make sure all plugs and hoses are replaced and secure. Remove inlet hose on pump and add about 3/4 oz. of lube oil. This will lubricate impeller when engine first starts until it picks up sea water.


FRESH WATER COOLING SYSTEM: All Models Except M-15

1. Inspect the heat exchanger and exhaust manifold for secure mounting and interior cleanliness. If system was filed with a 50/50 water and antifreeze mixture for storage, leaks will be easier to detect than if the system was drained. The coolant should be relatively clear and should be free of scale or other foreign particles.

2. If system was drained and inspection is satisfactory, fill slowly with coolant and replace pressure cap. Recheck coolant level after engine has run and reached operating temperature. Use caution when removing cap when engine is hot, you could get burnt.

3. Use antifreeze or rust preventative in system to prevent rust.

EXHAUST SYSTEM:

1. Check all hoses and hose clamps for serviceability and security. Any worn or damaged hoses or clamps must be replaced before operation.

2. Check all valves and remove all plugs before operation.

3. Check complete system monthly for leaks, make repairs as needed.


ELECTRICAL SYSTEM:

1. Inspect all wiring, terminals, controls and switches for damage or corrosion.

2. Install a fully charged battery and connect it correctly. (NEGATIVE GROUND.) Be careful to not short across negative and positive terminals.

FUEL SYSTEM:

1. Fuel tank must be clean, free of water and securely mounted. If it was filled with fuel for storage, FUEL MUST BE CLEAN.

2. Check fuel cap vent hose. It must be open for unrestricted air venting.

3. Fuel lines must be secure and all clamps and nuts tight. Lines must not be leaking. Fuel system will require bleeding before operation, if tank has been drained or filter has been replaced. (See instructions covering fuel system bleeding).

GENERAL:

All of the above items must be carefully checked if satisfactory operation is to be expected, good common sense will aid during servicing.

Refer to the start up check list in this manual after above items have been checked and before attempting to start the engine so that the proper procedure may be followed. In some cases other add ons may require servicing.

WITH THE BOAT IN THE WATER, check freedom of the propeller shaft in the bearings and alignment of the propeller shaft with the engine. Shaft alignment should not be more than .002" to .004" out at four points in one position at coupling flange and the same four points in the same position when shaft and coupling is rotated 180 from first check. If propeller shaft is out of alignment, we strongly recommend that realignment be performed by a qualified mechanic familiar with the installation.

Also, it may be necessary to tighten the stuffing gland just enough to stop excessive leakage along the shaft. Excessive tightening will cause power loss and burned stuffing material. A slight seepage is necessary to lubricate the stuffing gland.

Any problems arising from this pre-use inspection requiring special tools or attention should be referred to the boat dealer, a Universal Dealer service center, or a qualified diesel engine service center.