Cummins/Onan JWC4-10S-3 — Removing and Replacing Valve Guides
Repair & overhaul · cylinder block / valve guides
For the Cummins/Onan JWC4-10S-3, from the Cummins/Onan service manual.
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Procedure
- Use a valve guide puller to remove the guide without damaging the block.
- Install new guide with a replacer or driver.
- Install exhaust valve guide 1 inch from top of guide to top of block.
- Install intake valve guide 1-5/8 inch from top of guide to top of block.
- Check valve tappet clearance in guide (.0005 to .002 in).
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Exhaust guide 1 in above block top
- Intake guide 1-5/8 in above block top
- Tappet clearance in guide .0005 to .002 in
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.