Allis-Chalmers 3500 MK II / SOOMKII 1.5 — Torquing Cylinder Head Capscrews
Repair & overhaul
For the Allis-Chalmers 3500 MK II / SOOMKII 1.5, from the Allis-Chalmers owner's manual.
Applies to: Allis-Chalmers 3500 MKII engine
Before you start
- Torque figures based on engine oil lubricated threads; do not use extreme pressure lubricants.
Procedure
- Clean top deck of block and underside of head.
- Check cylinder sleeve protrusion 0.002 to 0.005 in; adjust with shims if needed.
- Install new gasket with indicated side down; do not use sealer.
- Install fire rings on each sleeve with no overlap.
- Install head; lubricate threads and underhead of 20 short capscrews; torque to 90 to 110 lb-ft in sequence A.
- Install rocker arm shaft; lubricate 6 long capscrews; torque to 90 to 100 lb-ft working from center outward.
- Tighten all 26 capscrews to 165 lb-ft in sequence B; then retighten all 26 capscrews again.
- Run engine about 1 hour under load; retighten all 26 capscrews to 165 lb-ft and set valve lash to 0.015 in hot.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Short capscrews 90 to 110 lb-ft (122 to 150 Nm)
- Long capscrews 90 to 100 lb-ft (122 to 136 Nm)
- All 26 capscrews 165 lb-ft (224 Nm)
- Rocker arm bracket 3/8 capscrews 28 to 33 lb-ft (38 to 45 Nm)
Full service-parts list: Allis-Chalmers 3500 MKII engine →
Source: Allis-Chalmers owner's 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.