Generac — Adjusting Valve Clearance
Adjustments · Engine
From a Generac owner's manual — check it applies to your exact model before use.
Applies to: Generac 7 kW PowerPact
Procedure
- Ensure engine is at 60-80 F (16-27 C).
- Remove enclosure lid and back panel if not already removed.
- Ensure spark plug wire is removed and out of the way.
- Remove the six screws attaching the valve cover.
- Loosen the rocker jam nut; turn the pivot ball stud with a 13 mm Allen wrench while checking clearance with a feeler gauge to 0.002-0.004 in (0.05-0.1 mm).
- Hold the pivot ball stud in place and tighten the rocker arm jam nut to 174 in-lb (19.68 N-m); recheck clearance.
- Install new valve cover gasket, starting all six screws before tightening.
- Install the valve cover; tighten fasteners to 35-62 in/lb (4-7 Nm).
- Install the rubber plug into the fan screen.
- Install the spark plug and attach the spark plug wire.
- Install the back panel and enclosure top lid; tighten all fasteners securely.
- Place the generator in AUTO.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- {'item': 'Valve clearance', 'value': '0.002-0.004', 'unit': 'in (0.05-0.1 mm)'}
- {'item': 'Rocker arm jam nut torque', 'value': '174', 'unit': 'in-lb (19.68 N-m)'}
- {'item': 'Valve cover fastener torque', 'value': '35-62', 'unit': 'in/lb (4-7 Nm)'}
Full service-parts list: Generac 7 kW PowerPact →
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.