Generac G0072100 — Adjusting Valve Clearance
Adjustments · engine valvetrain
For the Generac G0072100, from the Generac owner's manual.
Applies to: Generac G0072100, Generac G-Force 400 Series engine, Generac G-Force 800 Series engine, Generac G-Force 1000 Series engine
Before you start
- Risk of Burn. Allow the engine to cool before performing the following procedure.
Procedure
- Remove spark plug wire(s) and position away from spark plug(s).
- Remove spark plug(s).
- Remove the four screws attaching valve cover. Remove and discard gasket.
- Verify piston is at TDC of its compression stroke (both valves closed).
- Loosen rocker jam nut using a 10 mm wrench (10 kW units) or 13 mm wrench (20-24 kW units).
- Turn pivot ball stud using a 14 mm wrench (10 kW) or 10 mm hex key (20-24 kW) while checking clearance with a feeler gauge.
- Hold pivot ball stud and tighten rocker arm jam nut.
- Inspect valve clearance to verify it did not change.
- Install new valve cover gasket and valve cover; tighten fasteners in a cross pattern.
- Install spark plug(s) and tighten to 18 ft-lbs (25 Nm); attach spark plug wires.
- Repeat process for other cylinder if equipped.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Valve clearance 0.002-0.004 in (0.05-0.1 mm)
- Jam nut 80 in-lbs (9.0 Nm) 10 kW; 60 in-lbs (6.8 Nm) 20-24 KuduParts $85.00 FridayParts $110.92 kW
- Valve cover fasteners 53 in-lbs (6.0 Nm) 10 kW; 174 in-lbs (19.68 Nm) 20-24 KuduParts $85.00 FridayParts $110.92 kW
Full service-parts list: Generac G0072100 →
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.