Mitsubishi S12A2 — Measure and adjust V-belt deflection
Adjustments · V-belts (fan, water pump, alternator)
For the Mitsubishi S12A2, from the Mitsubishi owner's manual.
Applies to: Mitsubishi S12A2, Mitsubishi S12A2 engine
Before you start
- Never adjust the V-belts while the engine is running
- Change the belts if cracked, frayed or cut; keep belts clear of oil or grease
Procedure
- Measure the deflection of the belts by applying approximately 98 to 147 N midway between pulleys.
- Adjust if deflection is not approximately 10 to 15 mm.
- For fan belt: remove belt cover, loosen fan-bracket mounting bolts, turn adjusting rod, tighten bolts.
- For water-pump belt: remove belt cover, loosen tension-bracket bolts, turn tension bolt, tighten bolts.
- For alternator: remove belt cover, loosen alternator mounting bolts, turn adjusting rod, tighten bolts.
Tools required
- Special V-belt gauge 82591-09100 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Deflection approximately 10 to 15 mm with 98 to 147 N force
Full service-parts list: Mitsubishi S12A2 →
Source: Mitsubishi 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.