Home » GM 6.5 » GM/Detroit 6.5L – DRIVE BELT SERVICE


Maintaining the multiple ribbed drive belt and pulleys can extend the normal life of a drive belt.

Examine the pulleys for chips, nicks, tool marks,
cracks, bent sidewalls, corrosion, or other damage.
1. Place a straightedge or position a cord across the two pulleys so they touch at all points (figure 34).
2. Turn each pulley one half revolution and recheck with a straightedge or cord. Full contact at all points must be made. If contact is not made at all points, the pulley may be warped or its shaft could be bent. Replace any parts found to be damaged.
3. If the belt becomes loose and squeals or the belt comes off the engine drive pulleys, refer to “Diag­nosis of Drive Belt System.”

• Routine inspection of the belt may reveal cracks in the belt ribs. These cracks will not impair belt per­ formance and are not a basis for belt replacement.
If sections of the belt are missing, the belt should be replaced.

Do not use drive belt dressings to extend belt life.
Use of belt dressing will soften the belts and cause deterioration. Oil or grease contamination on the belt or pulleys will also deteriorate the belt.

Install a multiple ribbed belt following the belt routings shown in figures 35, 36, 37, and 38. The grooves in the belt must match the grooves in the pulleys. The ten­sioner is spring loaded. After removing the belt, the tensioner will return to the tension position.

Remove or Disconnect (Figures 35 through 38)

NO TICE: Do not allow the drive belt tensioner to snap in to the “ free” position. This may result in damage to the tensioner.

1. Use a 1/2-inch breaker bar with a socket placed on the tensioner pulley axis bolt and rotate the ten­sioner to release belt tension.

2. Belt.

Install or Connect (Figures 35 through 38)
1. Route belt over all the pulleys except the belt ten­sioner.
2. Use a 1/2-inch breaker bar with a socket placed on the tensioner pulley axis bolt and rotate the tensioner to the released position.
3. Belt over the belt tensioner pulley.
4. Check the belt for correct “V” groove tracking around each pulley.


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