Generac — Test 20 - Check Spark Plugs / Test 23 - Check Valve Adjustment
Adjustments · engine valvetrain
From a Generac service manual covering: GP1000, GP1100, GP1800, GP2000, GP2200, GP2600, GP2800, GP3250, GP3300, GP3600, GP5000, GP5500…. Check it applies to your exact model before use.
Applies to: Generac GP1800, Generac GP3250, Generac GP3300, Generac GP5000
Procedure
- Adjust valve clearance with engine at room temperature
- Position piston at TDC of compression stroke (both valves closed), or set intake/exhaust valve fully open method
- Loosen rocker arm jam nut; turn pivot ball stud while checking clearance with a feeler gauge
- When clearance is correct, hold pivot ball stud and tighten rocker arm jam nut to specified torque with a crow foot wrench
- Recheck valve clearance to make sure it did not change
- Install rocker arm cover with a new gasket
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- see valve clearance and rocker arm jam nut torque tables
Full service-parts list: Generac GP1800 →, Generac GP3250 →, Generac GP3300 →, Generac GP5000 →
Source: Generac service 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.