Generac — Tightening Cylinder Head Bolts
Maintenance
From a Generac service manual covering: IM100G, IM80G, NP100G, NP80G. Check it applies to your exact model before use.
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Procedure
- Remove all spark plugs, oil pump drive gears, retainer and bolts.
- Retighten cylinder head bolts while the engine is cold at approximately 68° F. (20° C.).
- Tighten bolts to 47-51 foot-pounds (64-69 N-m) in the sequence shown in Figure 2.
Tools required
- Torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 47-51 ft-lbs (64-69 N-m)
- Engine cold approximately 68° F. (20° C.)
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.