Cummins/Onan — Crosshead Adjustments
Adjustments
From a Cummins/Onan operator's manual covering: G-1710, G-495, G-743, G-855, GTA-1710, GTA-743, GTA-855. Check it applies to your exact model before use.
Applies to: Cummins/Onan G-855
Procedure
- Loosen crosshead adjusting screw locknut; back off screw one turn.
- Use light finger pressure at rocker lever to hold crosshead against valve stem nearest push tube.
- Turn down adjusting screw until it contacts its corresponding valve stem.
- With new crossheads and guides, advance screw an additional one-third of one hex (20 degrees).
- Hold screw and tighten locknut to 25-30 ft-lb.
- Check clearance between crosshead and valve spring retainer; minimum 0.020 inch.
Tools required
- wire gauge Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- locknut torque 25-30 Amazon eBay FridayParts $173.00 ft-lb
- crosshead-to-retainer clearance minimum 0.020 inch
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.