Generac — Check/Adjust Valves
Adjustments · Valve train
From a Generac service manual covering: Craftsman 2200i C0010020, Craftsman 3000i C0010030, GP2200, GP3000i, GP3500iO, IQ3500, PRO-3000i INV3000DMN, Premier 2200i INV2200DMN, iQ2000, iQ3500, iX 1600, iX 2000…. Check it applies to your exact model before use.
Applies to: Generac GP3000i, Generac GP3500iO, Generac IQ3500, Generac iX 1600, Generac iX 2000
Procedure
- Verify the piston is at top dead center (TDC) of its compression stroke (both valves closed).
- Remove four (4) screws from rocker cover.
- Remove rocker cover and rocker cover gasket.
- Loosen rocker arm jam nut. Turn adjustment screw in to decrease clearance or out to increase clearance.
- Hold socket steady and tighten lock nut to specification; check clearance and make minor adjustments.
- After tightening jam nut, recheck valve clearance to make sure it did not change.
- Install rocker cover, gasket and four screws; tighten to specifications.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- GP3000i/GP3500io/IQ3500: 0.004-0.006 in (0.10-0.15 mm)
- iQ and iX: 0.004 ± 0.001 in (0.10 ± 0.02 mm)
Full service-parts list: Generac GP3000i →, Generac GP3500iO →, Generac IQ3500 →, Generac iX 1600 →, Generac iX 2000 →
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.