Craftsman Marine CM4.65 / CM4.80 — Replace cooling liquid
Maintenance · Inner cooling circuit
For the Craftsman Marine CM4.65 / CM4.80, from the Craftsman Marine owner's manual.
Applies to: Hyundai CM4.65 engine, Hyundai CM4.80 engine
Before you start
- Open the filler cap on top of the heat exchanger housing only when the engine is cold
- Never add sea (or salt) water into the inner cooling circuit
Procedure
- Remove the hose from the heat exchanger to drain the heat exchanger.
- Open the drain cock to drain the engine block.
- Remove the filler cap from the expansion tank and/or heat exchanger housing to drain the internal cooling circuit completely.
- After draining reconnect the hose but leave the drain cock open.
- 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.
- Put the filler cap back in place and close the drain cock in the engine block.
Specs & values
- Cooling system capacity 9 litres (inter cooler) / 9.5 litres (keel cooler)
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.