Cummins/Onan — Out-of-Service Protection (30 days or longer)
Maintenance · Complete unit
From a Cummins/Onan operator's manual covering: 12.0MDJF-53CR, 12.0MDJF-53CR4, 12.0MDJF-54R, 12.0MDJF-55DR, 12.0MDJF-57R, 15.0MDJ F .. .4R 196 D, 15.0MDJF, 15.0MDJF-3CR, 15.0MDJF-3CR4, 15.0MDJF-5DR. Check it applies to your exact model before use.
Applies to: Cummins/Onan 12.0MDJF-53CR, Cummins/Onan MDJF (Onan J-series diesel) engine, Cummins/Onan MDJF engine
Before you start
- Discharged batteries are subject to severe damage if exposed to freezing temperatures. Store all batteries in a fully charged condition and maintain charge during storage.
Procedure
- Clean air cleaner and air intake; cover or seal exposed air intake openings.
- Clean and lubricate governor/throttle linkage (metal ball joints only).
- Drain engine lubricating oil while warm; refill and tag engine; remove injectors and pour 2 oz rust inhibitor oil into each cylinder, crank by hand, reinstall injectors.
- Drain entire cooling system including water cooled exhaust manifold and exhaust line; service with clean fresh water and prime pumps.
- Disconnect batteries, remove from vessel; store fully charged and maintain charge.
Specs & values
- 2 ounces of rust inhibitor oil per cylinder
Full service-parts list: Cummins/Onan 12.0MDJF-53CR →
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.