Hercules G-1600 — Cylinder Head Installation Torque Sequence
Repair & overhaul
For the Hercules G-1600, from the Hercules service manual.
Before you start
- Torque values apply to bolts with lubricated threads (preservative oil acceptable).
Procedure
- Make sure mating surfaces on head and block are absolutely clean and install new head gasket on block.
- Install cylinder head on block and secure with capscrews.
- Tighten screws with a torque wrench using the sequence shown; first 45-55 ft. lbs. then 60-65 ft. lbs.
- Install push rods, rocker arm assembly, and the oil tubes A and B.
- Adjust valve tappet clearance to Specifications.
- Retighten cylinder head capscrews and reset valve tappet clearances after 25 to 40 hours of operation.
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. (Power Production Wrench), 60-65 ft. lbs. (Hand Torque Wrench)
- Retighten after 25 to 40 hours
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.