Cummins/Onan — Starting (Cold Engine)
Operation
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
- Do not apply overvoltage to the starting circuit; overvoltage will destroy the glow plugs and air heater in two to three seconds.
Procedure
- Above 55 deg F, depress the manifold heater switch for one minute.
- Push START-STOP switch to its START position.
- Release switch after engine starts and reaches speed.
- Oil pressure should read at least 20 psi.
Specs & values
- Oil pressure at least 20 psi
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.