Craftsman Marine CM4.33 / CM4.42 — Replace cooling liquid
Maintenance · Inner cooling circuit
For the Craftsman Marine CM4.33 / CM4.42, from the Craftsman Marine owner's manual.
Applies to: Craftsman Marine CM4.33, Craftsman Marine CM4.42, Mitsubishi CM4.33 engine, Mitsubishi CM4.42 engine
Before you start
- Never add sea (or salt) water into the inner cooling circuit!
Procedure
- Remove the two drain plugs of the cooling system from the engine block and the heat exchanger housing.
- Remove the filler cap from the expansion tank and/or heat exchanger housing to drain the liquid.
- Replace the drain plugs and tighten them well.
- Remove the bolt on top of the thermostat housing cover to vent (air-bleed) the system.
- Fill the system with a mixture of 40% anti-freeze and 60% clean tap water to about 1 cm below the bottom of the filler pipe.
- After first warm-up and complete cool-down, check the coolant level and top up if necessary.
Specs & values
- 40% anti-freeze and 60% clean tap water
Full service-parts list: Craftsman Marine CM4.33 →, Craftsman Marine CM4.42 →
Source: Craftsman Marine owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.