Generac — Valve Components Removal
Repair & overhaul · Valve train
From a Generac service manual covering: GN-190, GN-220, NP-30G, NP-40G. Check it applies to your exact model before use.
Applies to: Generac NP-30G, Generac GN-190 / GN-220 engine, Generac GN-220 engine
Before you start
- Replace the head gasket every time the head is removed.
- Replace the rocker arm cover gasket each time the cover is removed.
- ALWAYS WEAR SAFETY GLASSES WHEN REMOVING THE VALVE SPRINGS.
Procedure
- Remove the four M6-1.00 x 12mm screws and lockwashers, then remove the rocker arm cover and its gasket.
- Loosen the rocker arm jam nuts on the pivot ball studs, then remove the pivot ball studs, rocker arms, jam nuts and push rod guide plate.
- Remove the push rods.
- Remove the cylinder head bolts, then remove the cylinder head and head gasket.
- Compress the valve spring with your thumb and slide the larger hole of the valve spring retainer toward the valve stem.
- Release the spring and remove the retainer, spring and spring washer.
- Remove the intake and exhaust valves.
- Clean all parts and remove carbon from valve heads and stems.
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.