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Mitsubishi CM4.42 Engine

The Mitsubishi CM4.42 is a 1.76 L idi (indirect) engine rated at 3000 rpm, producing up to 30.9 kW. It powers generator sets from Craftsman Marine.

Also known as: Mitsubishi CM4.42

1.758 L
Displacement
3000 rpm
Rated speed
30 kW
Gross power
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Engine specifications

Displacement1.758 L
AspirationIDI (indirect)
Rated speed3000 rpm
Gross power30 kW

Common problems

13
  • Starter motor does neither rotate nor engage
    Cause: Defective or discharged battery, Burnt fuse, Loose or corroded connections in the starter circuit, Defective starter switch or relay, Defective starter motor or pinion does not engage, Starter relay not activated owing to insufficient voltage, on account of a too long cable from engine to instrument panel, Jammed components
    Fix: Check battery/charge or replace and check alternator for proper functioning, Replace, Clean and tighten the connections, Replace defective component, Replace starter motor Fit an auxiliary starter relay
  • Oil level too low
    Fix: Top up / Replace
  • Oil level too high
    Fix: Lower oil level
  • Insufficient supply of combustion air
    Fix: Check air inlet and ventilation openings in engine room
  • Incorrect SAE-specification or quality of lubrication oil
    Fix: Replace by good quality engine lubricating oil
  • Fuel filter clogged up by water and/or dirt
    Fix: Check / replace
  • Filter of electrical fuel lift pump clogged
    Fix: Check / replace
  • Excessive wear and tear to cylinder or piston
    Fix: Check compression; overhaul engine, if needed
  • Excessive inclination angle of engine
    Fix: Check / adjust alignment
  • Engine becomes overheated
    Cause: Level of cooling liquid too low, Raw water seacock closed
  • Defective oil filter
    Fix: Check / clean or replace if necessary
  • Defective injector / injection pump
    Fix: Check / replace
  • Defective electrical fuel lift pump
    Fix: Replace defective component

Compiled from service & troubleshooting documentation across every generator set that uses the Mitsubishi CM4.42.

Common questions

What is the displacement of the Mitsubishi CM4.42?

The Mitsubishi CM4.42 has a displacement of 1.758 liters.

Which generators use the Mitsubishi CM4.42 engine?

The Mitsubishi CM4.42 powers 1 generator set(s), including Craftsman Marine CM4.42.

What is a common problem with the Mitsubishi CM4.42 engine?

A commonly reported issue on generators using the Mitsubishi CM4.42 is: Starter motor does neither rotate nor engage. Cause: Defective or discharged battery, Burnt fuse, Loose or corroded connections in the starter circuit, Defective starter switch or relay, Defective starter motor or pinion does not engage, Starter relay not activated owing to insufficient voltage, on account of a too long cable from engine to instrument panel, Jammed components. Fix: Check battery/charge or replace and check alternator for proper functioning, Replace, Clean and tighten the connections, Replace defective component, Replace starter motor Fit an auxiliary starter relay.