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Generac QuietPact 40 LP — Adjusting Valve Clearance

Adjustments · Engine Valves

For the Generac QuietPact 40 LP, from the Generac owner's manual.

Applies to: Generac QuietPact 40 LP, Generac GN-220 engine

Procedure

  1. Loosen the rocker arm jam nut.
  2. Use an allen wrench to turn the pivot ball stud while checking clearance between the rocker arm and valve stem with a feeler gauge.
  3. Hold the pivot ball stud with the allen wrench and tighten the rocker arm jam nut with a crows foot to 65-85 inch-pounds torque.
  4. Recheck valve clearance after tightening the jam nut 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

  • Correct clearance 0.001-0.003 inch (0.03-0.07 mm)
  • Jam nut torque 65-85 inch-pounds
  • Engine at room temperature; piston at Top Dead Center of compression stroke

Full service-parts list: Generac QuietPact 40 LP →

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.

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