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Drive Belt: Inspection

  1. Visually check the belt for excessive wear, frayed cords, etc.

    If any defect has been found, replace the drive belt.

    NOTE: Cracks on the rib side of a belt are considered acceptable. If the missing chunks from the ribs are found on the belt, it should be replaced.
    Fig 1: Identifying Cracks Rib Side Drive Belt
    G02575628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Using a belt tension gauge, measure the belt tension.

    Belt tension gauge: 

    DENSO BTG-20 (95506-00020) or 

    Boroughs No. BT-33-73F 

    Drive belt tension: 

    New belt: 440 - 540 N (45 - 55 kgf) 

    Used belt: 240 - 340 N (25 - 35 kgf) 

If the belt tension is not as specified, adjust it.

Fig 2: Measuring Belt Tension Using Belt Tension Gauge
G02575629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE:
  • "New belt" refers to a belt which has been used less than 5 minutes on a running engine.
  • "Used belt" refers to a belt which has been used on a running engine for 5 minutes or more.
  • After installing a belt, check that it fits properly in the ribbed grooves.
  • Check with your hand to confirm that the belt has not slipped out of the groove on the bottom of the pulley.
  • After installing a new belt, run the engine for about 5 minutes and recheck the belt tension.
Fig 3: Groove
G02575630Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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