Hercules — Crankshaft and Main Bearings Installation
Repair & overhaul · engine
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
Procedure
- Install upper main bearings in cylinder block; bearings with two holes and oil groove, in same positions.
- Apply clean engine oil to crankshaft journals and bearings.
- Set crankshaft in place aligning timing marks on crankshaft gear and camshaft gear.
- Install lower main bearings in bearing caps and install caps in original positions.
- Tighten bearing cap bolts to torque from Table 5-3; start with center cap and work alternately toward both ends.
- Check crankshaft end thrust: 0.005 to 0.010 inch for new bearings; maximum 0.015 inch.
- Install connecting rod bearings and caps.
- Install internal oil jumper line if used.
- Install front and rear oil pan adapters, oil pump, tachometer drive if used.
- Install gear housing cover and fan drive pulley.
- Install fan and belts, muffler and exhaust pipe, air cleaner.
- Install oil pan and fill crankcase with proper grade oil.
- Install radiator, hoses, and support brackets.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Main bearing cap bolt torques: 9/16-inch FridayParts $221.94 front/rear/intermediate 130 foot-pounds T-stamped, 80 foot-pounds plain; 1/2-inch FridayParts $37.68 center 100 foot-pounds T-stamped, 80 foot-pounds plain. Crankshaft end thrust 0.005 to 0.010 inch new; maximum 0.015 inch.
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.