Generac NP-30G / NP-40G — Valve Components Installation
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
Procedure
- Lubricate valve stems and guides with engine oil.
- Install intake and exhaust valves through their guides in the cylinder head.
- Install valve spring washers, springs and retainers over the valve guides; compress spring and slide retainer small opening over valve stem.
- Position a new head gasket and install the cylinder head.
- Install cylinder head bolts and tighten in sequence 1-2-3-4-5 to recommended torque.
- Place push rod guide plate in position, then install rocker arm and pivot ball stud.
- Install push rod with either end against tappet between guide plate tabs and into rocker arm socket.
Tools required
- Torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
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.