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Home›Repair guides›Inspecting and Adjusting V-belt Tension

Mitsubushi ST2R-Y1IPTA. — Inspecting and Adjusting V-belt Tension

For the Mitsubushi ST2R-Y1IPTA..

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Before you start

  • Keep oil and grease away from the belt, since they may cause the belt to slip and shorten service life
  • Excessive V-belt tension can cause rapid wear of the alternator bearing and shorten service life of the belt

Procedure

  1. Visually inspect the V-belt for surface separations and damages
  2. If damages or surface separations are found, replace the V-belt with a new one
  3. Apply force (approx 98 to 147 N or 10 to 15 kgf) to the center of the V-belt between pulleys
  4. Deflection should be 7 + 1 mm for a new belt and 9 + 1 mm for readjustment
  5. If the deflection does not meet the specification, adjust the tension
  6. Remove the alternator front cover and belt cover
  7. Loosen all retaining bolts on the alternator and adjusting rod
  8. Loosen the upper and lower lock nuts on the adjusting rod (note: lower nut has left-hand threads)
  9. Turn the adjusting rod to adjust the V-belt tension
  10. After tension adjustment, tighten the upper and lower lock nuts
  11. Tighten all the retaining bolts on the alternator and adjusting rod
  12. Reinstall the alternator front cover and belt cover

Tools required

  • filter wrench
  • alternator front cover removal tool

Specs & torque values

  • V-belt tension deflection 7 + 1 mm for new belt
  • 9 + 1 mm for readjustment
  • force 98 to 147 N or 10 to 15 kgf

Source: manual:Mitsubishi S12R-Y1PTA Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.