Cummins/Onan 4.0 MCCK / 6.5 MCCK — Extended Out-of-Service Protection (Gasoline Engines)
Maintenance · Generating set
For the Cummins/Onan 4.0 MCCK / 6.5 MCCK, from the Cummins/Onan operator's manual.
Applies to: Cummins/Onan MCCK engine
Before you start
- Do not smoke while servicing batteries; explosive gases are emitted.
Procedure
- Check coolant level, add if necessary using recommended anti-freeze.
- Run set until thoroughly warm under at least 50 percent load; stop by shutting off fuel supply.
- Drain oil base while still warm; refill and attach a tag indicating viscosity of oil used.
- Remove spark plugs; pour 1 ounce rust inhibiting oil (or SAE #10 oil) into each cylinder; crank over several times; install spark plugs.
- Clean throttle and governor linkage; protect by wrapping with a clean cloth.
- Plug exhaust outlets to prevent entrance of moisture, bugs, dirt.
- Clean off dirt and dry entire unit; coat parts likely to rust with light film of oil or grease.
- Disconnect battery and follow standard battery storage procedure; apply nonconductive grease to cable terminal lugs.
- Fill fuel tank to prevent condensate contamination.
- Provide a suitable protective cover for the entire unit.
- Drain sea water cooling system.
Source: Cummins/Onan operator'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.