Alternator

a. Visually check the belt for excessive wear, frayed cords etc.
If any defect has been found, replace the drive belt.

HINT: Cracks on the rib side of a belt are considered acceptable. If the belt has chunks missing from the ribs, it should be replaced.




b. Using a belt tension gauge, measure the drive belt tension.
Belt tension gauge:
DENSO BTG-20 (95506-00020)
Borroughs No. BT-33-73F

Drive belt tension:

New belt 175 ± 5 lbf
Used belt 115 ± 20 lbf

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

HINT:
^ "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.