Generac G-Force 400 Series / RTG16EZA3 — Adjusting Valve Clearance
Adjustments · Valve train
For the Generac G-Force 400 Series / RTG16EZA3, from the Generac owner's manual.
Applies to: 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 engine to cool before performing procedure.
Procedure
- Remove spark plug wire(s) and spark plug(s).
- Remove valve cover screws and discard gasket.
- Verify piston is at TDC of compression stroke.
- Loosen rocker jam nut (10 mm wrench 10 kW; 13 mm 20–24 kW).
- Turn pivot ball stud while checking clearance with feeler gauge.
- Hold stud and tighten jam nut to specification.
- Recheck clearance, install new gasket and valve cover.
- Install spark plug(s) and tighten to 18 ft-lbs (25 Nm).
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Jam nut 53 in-lbs (10 kW); 174 in-lbs (20–24 kW)
- Valve cover 80 in-lbs (10 kW); 60 in-lbs (20–24 kW)
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.