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Generac Impact-36G / NP-36G — Adjust Valve Clearance

Adjustments · Rocker arm / valve stem

For the Generac Impact-36G / NP-36G, from the Generac owner's manual.

Applies to: Generac GN-220 engine

Procedure

  1. Engine at room temperature, piston at TDC of compression stroke.
  2. Loosen the rocker arm jam nut.
  3. Turn pivot ball stud with allen wrench while checking clearance with feeler gauge.
  4. When clearance is correct, hold pivot ball stud and tighten jam nut with crows foot.
  5. Tighten jam nut to 65-85 inch-pounds torque.
  6. Recheck valve clearance to be 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

  • Clearance 0.001-0.003 inch (0.03-0.07mm)
  • Jam nut torque 65-85 inch-pounds (7-10 N-m)

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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