Generac QuietPact 40 — Adjusting Valve Clearance
Adjustments · Rocker arms / valves
For the Generac QuietPact 40, from the Generac owner's manual.
Applies to: Generac QuietPact 40, Generac GN-220 engine
Procedure
- Engine must be at room temperature with piston at TDC of compression stroke.
- Loosen the rocker arm jam nut.
- Turn the pivot ball stud with an allen wrench while checking clearance with a feeler gauge.
- Correct clearance is 0.001-0.003 inch (0.03-0.07 mm).
- Hold the pivot ball stud and tighten the rocker arm jam nut to 65-85 inch-pounds.
- After tightening the jam nut, recheck valve clearance.
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 (0.03-0.07 mm)
- Jam nut torque 65-85 inch-pounds
Full service-parts list: Generac QuietPact 40 →
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.