Generac NP-30G — Adjusting valve clearance
Adjustments · Rocker arm assembly
For the Generac NP-30G, from the Generac owner's manual.
Applies to: Generac NP-30G, Generac GN-220 engine
Procedure
- Engine should be at room temperature and piston at Top Dead Center of its compression stroke (both valves closed).
- Loosen the rocker arm jam nut.
- Use an allen wrench to turn the pivot ball stud while checking clearance between rocker arm and valve stem with a feeler gauge.
- Set clearance to 0.001-0.003 inch (0.03-0.07mm).
- Hold the pivot ball stud with the allen wrench and tighten the rocker arm jam nut with a crows foot.
- Recheck valve clearance to make sure it did not change.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Valve clearance 0.001-0.003 inch (0.03-0.07mm)
- Tighten jam nut to 65-85 inch-pounds (7-10 N-m)
Full service-parts list: Generac NP-30G →
Source: Generac owner'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.