Cummins/Onan 6.5NH - 3CR / 6000 A — Piston and Connecting Rod Removal
Repair & overhaul · Pistons and connecting rods
For the Cummins/Onan 6.5NH - 3CR / 6000 A, from the Cummins/Onan service manual.
Applies to: Cummins/Onan NH engine
Before you start
- Be careful not to scratch the crankpin or cylinder wall when removing these parts.
Procedure
- If there is a noticeable wear ridge at the top of each cylinder, remove it before removing the pistons.
- Turn the crankshaft until a piston is at the bottom of the stroke.
- Remove the nuts from the connecting rod bolts.
- Lift the rod bearing cap from the rod.
- Push the rod and piston assembly out the top of the cylinder with the handle end of a hammer.
- Keep the connecting rod bearing caps and bearings with their respective rods.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.