Hercules — Cylinder Head Installation and Torquing
Repair & overhaul
From a Hercules service manual — check it applies to your exact model before use.
Procedure
- Clean head and block mating surfaces; install new head gasket.
- Install cylinder head on block and secure with capscrews.
- Tighten bolts progressively in numbered sequence to 45-55 ft. lbs.
- Retorque to 60-65 ft. lbs. with hand torque wrench.
- Install push rods, rocker arm assembly and lube tubes.
- Adjust valve tappet clearance to specifications.
- Retighten capscrews and reset valve clearances after 25 to 40 hours.
Tools required
- torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 45-55 ft. lbs. first pass
- 60-65 ft. lbs. hand torque
- Lubricated threads (preservative oil acceptable)
Source: Hercules 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.