Generac — Checking and Adjusting Valve Clearance
Adjustments · valve train
From a Generac owner's manual — check it applies to your exact model before use.
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Before you start
- Contact Dealer if uncomfortable performing this procedure
Procedure
- Cool the engine before checking
- Remove spark plug wire and spark plug
- Rotate flywheel nut clockwise to bring piston to TDC on compression stroke
- At 60-80°F, remove valve cover (4 screws)
- Loosen rocker jam nut, turn pivot ball stud while checking clearance with feeler gauge
- Set intake to 0.005-0.007 in, exhaust to 0.007-0.009 in
- Tighten jam nut to 70-106 in/lbs holding pivot stud
- Recheck clearance after tightening
- Install new valve cover gasket and reattach cover
- Reinstall spark plug and wire
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Intake 0.005-0.007 in (0.13-0.17mm)
- Exhaust 0.007-0.009 in (0.18-0.22mm)
- Jam nut torque 70-106 KuduParts $44.00 in/lbs
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.