Drive Belt: Service and Repair
Removal
1. Remove the drive belt.
(1) Loosen the alternator mounting bolts (A).
(2) Loosen the tension by turning the tension adjusting bolt (B) counterclockwise.
(3) Remove the drive belt (C).
Inspection
1. Check belt for maintenance and abnormal wear of V-ribbed part. Replace if necessary.
CAUTION:
- Do not bend, twist or turn the drive belt inside out.
- Do not allow the drive belt to come into contact with oil, water and steam.
2. 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 belt has chunks missing from the ribs, it should be replaced.
Drive belt tension measurement and adjustment
Belt tension measurement
Measure the belt tension using a mechanical tension gauge or a sonic tension meter.
Belt tension
New belt:
637.4 - 735.5 N (65 - 75 kgf, 143.3 - 165.3 lbf)
Used belt:
441.3 - 539.4 N (45 - 55 kgf, 99.2 - 121.3 lbf)
CAUTION:
- If the engine has run for 5 minutes or more, the belt tension must be adjusted as a used belt.
- When installing the V-ribbed belt, all grooves on the pulley should be covered with belt ribs.
- A loose belt causes slip noise.
- Too tight belt cause bearing of alternator and water pump to damage.
Using a mechanical tension gauge (BT-33-73F, BTG-2 type)
1. While pressing the handle (A) of the gauge, insert the belt (B) between pulley and pulley (or idler) into the gap between spindle (C) and hook (D).
2. After releasing the handle (A), read a value on the dial pointed by the indicator (B).
Using a sonic tension meter (U-505/507 type)
1. Input the belt specifications into the tension meter (A).
NOTE:
Measurement of S (Span): Calculate average value after measuring the distance 3 - 4 times.
2. Locate the micro phone (B) close to the center of belt span (A) and bounce the belt by finger 2 - 3 times. Read a value on the display.
[With A/C]
[Without A/C]
If adjustment is necessary:
1. Loosen the mounting bolts (A).
2. Tighten the adjusting bolt (B) counterclockwise in loose tension; fasten the bolt clockwise in high tension.
3. Recheck tension of the belt.
4. After adjusting tension, tighten the mounting bolts.
Tightening torque
M10 bolt:
29.4 - 41.2 N.m (3.0 - 4.2 kgf.m, 21.7 - 30.4 lb-ft)
M8 bolt:
21.6 - 32.4 N.m (2.2 - 3.3 kgf.m, 15.9 - 23.9 lb-ft)
Installation
1. Install the drive belt.
(1) Install the drive belt (C).
(2) Adjust the tension by turning the tension adjusting bolt (B) clockwise.
Belt tension
New belt:
637.4 - 735.5 N (65 - 75 kgf, 143.3 - 165.3 lbf)
Used belt:
441.3 - 539.4 N (45 - 55 kgf, 99.2 - 121.3 lbf)
(3) Tighten the alternator mounting bolts (A) with the specified torque.
Tightening torque
M10 bolt:
29.4 - 41.2 N.m (3.0 - 4.2 kgf.m, 21.7 - 30.4 lb-ft)
M8 bolt:
21.6 - 32.4 N.m (2.2 - 3.3 kgf.m, 15.9 - 23.9 lb-ft)
