Cummins/Onan — Connecting Rod
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Misalignment may cause rapid wear.
Procedure
- Mark connecting rod before removal to reassemble same side facing camshaft.
- Oil dipper installed to splash oil toward camshaft side.
- Connecting rods available standard or .010, .020, .030 inch undersize.
- Reduce bearing clearance by dressing cap on #320 grit or finer abrasive cloth on flat surface.
- Align connecting rod and piston assembly on aligning gauge before reassembly.
- Ensure oil dipper properly installed.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- undersizes .010, .020, .030 inch
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.