Allis-Chalmers 3500 MK II / SOOMKII 1.5 — Adjusting Alternator and Water Pump Drive Belt Tension
Adjustments · Drive belts
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
- Apply force against stator laminations between alternator end frame, not against the end frame.
Procedure
- Loosen alternator adjusting brace capscrew and mounting screw.
- Move alternator in or out to obtain proper belt tension.
- Check tension using a Borroughs Tension Gauge BT-33-74 or equivalent.
- Retighten the capscrew.
Tools required
- Borroughs Tension Gauge BT-33-74 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- New belts installed at 110 lb (49.8 kg) tension
- Retighten whenever tension drops to 85 lb (38.5 kg)
- Always retighten to 105 lb (47.6 kg)
- Alternator drive belts: new at 125 lb (57 kg); retighten at 85 lb (38 kg); retighten old belts to 105 lb (48 kg)
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.