Generac — Check and Adjust Valve Clearance
Adjustments · Engine Valves
From a Generac service manual covering: QUIETPACT 55, QuietPact 65, QuietPact 75. Check it applies to your exact model before use.
Applies to: Generac QUIETPACT 55, Generac QuietPact 65, Generac QuietPact 75, Generac GTV-760 engine
Procedure
- Adjust valve clearance with engine at room temperature, piston at TDC of compression stroke.
- Loosen rocker arm jam nut, use 10mm allen wrench to turn pivot ball stud while checking clearance with feeler gauge.
- Set intake valve clearance 0.002-0.004 in and exhaust valve clearance 0.002-0.004 in.
- Hold pivot ball stud with allen wrench and tighten rocker arm jam nut to 174 inch-pounds with a crow's foot.
- Recheck valve clearance after tightening jam nut.
- Install rocker arm cover with new gasket and retain with four screws.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake Valve 0.002-0.004 in
- Exhaust Valve 0.002-0.004 in
- Rocker arm jam nut 174 inch-pounds
Full service-parts list: Generac QUIETPACT 55 →, Generac QuietPact 65 →, Generac QuietPact 75 →
Source: Generac service 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.