Generac G0070420 — Check Valve Clearance
Maintenance · Valve train
For the Generac G0070420, from the Generac owner's manual.
Applies to: Generac G0070420, Generac GH-426 engine, Generac GTH-530 engine, Generac GT-999 engine
Before you start
- The engine should be cool before checking the valve clearance.
Procedure
- Close fuel valve and disconnect battery to avoid accidental start-up.
- Remove spark plug wires and position away from plugs.
- Remove spark plugs.
- Make sure piston is at TDC of compression stroke (both valves closed).
- Remove intake screen at front of engine to access flywheel nut.
- Use large socket and socket wrench to rotate flywheel nut clockwise; watch piston through spark plug hole.
- Piston is at TDC at its highest point of travel.
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)
Full service-parts list: Generac G0070420 →
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.