www.marinedieseldirect.com is part of the TOAD Marine Supply. Order parts from this catalog online, by phone 616-820-0022, fax 616-396-1136 or email


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

 

GENERAL INFORMATION

ENGINE:
Universal Diesel engines are four stroke engines. They are designed with special swirl combustion chambers, balanced crankshaft system for minimum vibration and noise levels.

COOLING SYSTEM: (All Models Except M-15)
Engines are fresh water cooled, employing a rubber impeller sea water pump moving sea water through a heat exchanger thereby lowering the temperature of the fresh water coolant. A fresh water coolant supply is maintained in the expansion tank which is an integral part of the exhaust manifold. Coolant level should be checked at regular intervals and at least once each season for leakage, deposits and general condition. Always close the sea water cock before attempting any work on the coolant system. (Note the make of sea water pump for service parts under general information.)

COOLING SYSTEM: (Model M-15)
Engine is sea water cooled, having a rubber impeller sea water pump, with a recirculating temperature control thermostat. The mixing tee is to be located below the engine and sea water level to prevent air from entering the system causing overheating.

LUBRICATION SYSTEM:
Engines are pressure lubricated and use replaceable oil filters which should be changed regularly.

FUEL SYSTEM:
The fuel system utilizes either an electric on all current models or mechanical fuel pump on early M-15 & M-40, fuel filter, fuel injection pump with injectors and necessary fuel lines. Unused fuel coming from the injector nozzles is returned to the top of the fuel supply tank through a fuel return line.

ELECTRICAL SYSTEM:
All models are equipped with a 12 volt starter and a 51 amp alternator. Battery cable connections as well as all other electrical connections should be checked regularly. The V-belt driving the alternator and water pump should have finger pressure deflection of approximately 1/2".

1. Battery ground cable (-) should be connected to a component or cylinder block which is constructed of cast iron or steel.

2. Do not connect to the transmission, bell housing or front timing cover case.

3. It is recommended all ground connections are secure and properly coated to prevent corrosion or improper grounding. Check connection semi-annually.

GENERAL CARE:
If the boat is left afloat for periods of a month or more, the engine should be started at least every 14 days to prevent internal corrosion.

Regularly spray external unpainted surfaces and exposed, unpainted electrical equipment with a corrosion and moisture protective coating.

ENGINE ALIGNMENT TO SHAFT COUPLING:
It is the responsibility of the dealer or yard to properly align the engine and shaft to within .002" to .004" inches. The boat must be in the water when this is done. Alignment is not the responsibility of Universal Motors. If not done properly damage to shaft and engine can occur, usually vibration is present if alignment is off.

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