Craftsman Marine — Replace cooling liquid
Maintenance · Inner cooling circuit
From a Craftsman Marine owner's manual covering: CM 2.16, CM 3.27, CM3.27. Check it applies to your exact model before use.
Applies to: Craftsman Marine CM 2.16, Craftsman Marine CM 3.27
Before you start
- Never add sea (or salt) water into the inner cooling circuit!
- Open the filler cap on top of the heat exchanger housing only when the engine is cold.
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 completely.
- 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.
- Top up to about 1 cm below the bottom of the filler pipe.
- After the engine has warmed up and cooled down completely, check the coolant level again and top up if necessary.
Specs & values
- Mixture: 40% anti-freeze and 60% of clean tap water
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.