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