Hercules — Cylinder Head Installation
Repair & overhaul
From a Hercules service manual covering: D-1500, D-1700, D-2000, D-2300, D-3400, De3000. Check it applies to your exact model before use.
Applies to: Hercules D Series engine
Before you start
- Cylinder head nuts must be retightened and valve clearance reset after 1 hour of service.
Procedure
- Install new cylinder head gasket with bead down; use gasket cement.
- Install water outlet cover and gasket.
- Install valve assemblies.
- Place cylinder head assembly on block.
- Install cylinder head nuts and washers; tighten evenly from center outward.
- Tighten all nuts first to 75 foot-pounds, then 125 foot-pounds, and so forth per figure.
- Install valve pushrods.
- Install rocker arm assembly.
- Install fuel nozzle and holder assemblies.
- Install air cleaner, intake manifold, exhaust manifold, and coolant temperature gauge thermocouple.
- Install thermostat and housing; fill cooling system.
Tools required
- Torque wrench Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Cylinder head nut tightening sequence: 75 foot-pounds, then 125 foot-pounds, and so forth; final values from Table 6-1.
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.