Generac NP-30G / NP-40G — Valve Components Removal
Repair & overhaul · Valve Train
For the Generac NP-30G / NP-40G, from the Generac service manual.
Applies to: Generac NP-30G, Generac GN-190 / GN-220 engine, Generac GN-190 or GN-220 (see NOTE 2) engine, Generac GN-220 engine
Before you start
- ALWAYS WEAR SAFETY GLASSES WHEN REMOVING THE VALVE SPRINGS.
- Replace the head gasket every time the head is removed.
- Replace the rocker arm cover gasket each time the cover is removed.
Procedure
- Remove four M6-1.00 x 12mm screws and lockwashers; remove rocker arm cover and gasket.
- Loosen rocker arm jam nuts and pivot ball studs; remove studs, rocker arms, jam nuts and push rod guide plate.
- Remove the push rods.
- Remove the cylinder head bolts, then cylinder head and head gasket.
- Hold valve, compress spring and slide valve spring retainer to release spring; remove retainer, spring and washer.
- Remove intake and exhaust valves.
- Clean all parts and remove carbon from valve heads and stems.
Tools required
- Screwdriver/wrench set Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Generac NP-30G →
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.