Mitsubishi — Checking V-belt and adjusting belt tension
Adjustments · V-belt / alternator
From a Mitsubishi operator's manual — check it applies to your exact model before use.
Applies to: Mitsubishi S16R-Y1PTA-2 engine
Before you start
- Keep oil and grease away from the belt.
- Excessive V-belt tension can cause rapid wear of the alternator bearing.
Procedure
- Inspect V-belt for wear, cuts or surface separations; replace with a new belt if defective.
- Push the belt downward with about 49 +/- 5 N midway between pulleys; deflection should be 7 +/- 1 mm for new belt and 9 +/- 1 mm for retightening.
- Remove the alternator front cover and V-belt cover.
- Loosen all the retaining bolts on the alternator and adjusting rod.
- Loosen the upper and lower lock nuts on the adjusting rod (the lower nut has left-hand threads).
- Turn the adjusting rod to adjust V-belt tension, then tighten the upper and lower lock nuts.
- Tighten all the retaining bolts and reinstall the belt cover and alternator front cover.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Deflection: 7 +/- 1 mm [0.28 +/- 0.04 in.] new belt; 9 +/- 1 mm [0.35 +/- 0.04 in.] retightening
Source: Mitsubishi operator'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.