Cummins/Onan 3.6MKY / 4MKY — Crankcase Cover Removal and Installation

Repair & overhaul

For the Cummins/Onan 3.6MKY / 4MKY, from the Cummins/Onan service manual.

Applies to: Cummins/Onan 3.6MKY, Cummins/Onan 4MKY

Procedure

1. Remove the crankcase cover mounting bolts; do not pry the cover.
2. Hold the cover and lightly tap the end of the crankshaft with a plastic hammer.
3. Remove the cover carefully to prevent the shaft from scraping the oil seal lip.
4. Remove and tag shims from the crankshaft, camshaft and balancer shaft.
5. Make sure the governor shaft is properly positioned when installing the cover.
6. Use a new gasket, place the cover in position and secure all bolts in a star pattern to specification.

Source: Cummins/Onan service 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.

More Cummins/Onan repair guides →