GM/Detroit 6.5L – DRIVE BELT TENSIONER REPLACEMENT

4.3L, 5.0L, AND 5.7L ENGINES
Remove or Disconnect (Figure 27)
1. Negative battery cable.
2. Multiple ribbed drive belt. Refer to “Drive Belt Replacement.”
3. Bolt.
4. Tensioner.

Install or Connect (Figure 27)
1. Tensioner to mounting bracket.
2. Bolt.

Tighten
• Bolt to 83 N-m (61 Ibs. ft.).
3. Multiple ribbed drive belt. Refer to “Drive Belt Replacement.”
4. Negative battery cable.

C/K 2 AND 3 WITH 7.4L ENGINE AND A/C
Remove or Disconnect (Figure 28)
1. Negative battery cable.
2. Multiple ribbed drive belt. Refer to “Drive Belt Replacement.”
3. Bolt

4. Tensioner.
5. Idler pulley with bolt.

Install or Connect (Figure 28)
1. Tensioner to mounting bracket
2. Bolt.
• Bolt to 50 N.m (37 ibs. ft.).
3. Idler pulley with bolt to bracket.

Tighten
• Bolt to 85 N-m (63 Ibs. ft.).
4. Multiple ribbed drive belt. Refer to “Drive Belt Replacement.”
5. Negative battery cable.

DIESEL ENGINE
Remove or Disconnect (Figure 29)
1. Negative battery cable.
2. Multiple ribbed drive belt. Refer to “Drive Belt Replacement.”
3. Bolt and nut from upper brace.
4. Tensioner.

Install or Connect (Figure 29)
1. Tensioner to generator bracket.
2. Bolt and nut

Tighten
• Nut to 50 N-m (37 Ibs. ft.).
3. Multiple ribbed drive belt. Refer to “Drive Belt Replacement.”
4. Negative battery cable.

4.3L, i.OL, AND 5,7L ENGINES
Remove or Disconnect (Figure 30)
1. Negative battery cable.
2. Multiple ribbed drive belt. Refer to “Drive Belt Replacement.”
3. Idler pulley bolts and nuts from bracket (without A/C).
4. Idler pulley.
5. Bolts and nut from generator bracket.
6 . Generator bracket.

7. Stud (if needed).
Install or Connect (Figure 30)
1. Generator bracket stud (if removed).

Tighten
• Stud to 20 N-m (15 Ibs. ft.).
2. Generator bracket.
3. Bolts and nut.

Tighten
• Bolts and nut to 33 N.m (24 Ibs. ft.).
4. Idler pulley.
5. Bolts and nuts.

Tighten
• Nuts to 33 N-m (24 Ibs. ft.).
6. Multiple ribbed drive belt. Refer to “Drive Belt Replacement.”
7. Negative battery cable.

BELT TENSIONER BRACES 4.3L, 5.0L, AND 5.7L ENGINES WITH AIR CONDITIONING
Remove or Disconnect (Figure 31)
1. Negative battery cable.
2. Multiple ribbed drive belt. Refer to “Drive Belt Replacement.”
3. Bolts and nuts from braces.
4. Braces.

Install or Connect (Figure 31)
1. Brace (114).
2. Bolt (116) finger tight
3. Nut (116).

Tighten

• Nut (115) to 33 N.m (24 Ibs. ft.).
• Bolt (116) to 50 N.m (37 Ibs. ft.).
4. Brace (117) over bolt at compressor and then over stud at manifold.
5. Nut (112) finger tight.
6. Nut (113).

Tighten
• Nut (113) to 33 N-m (24 Ibs. ft.).
• Nut 112) to 33 N.m (24 Ibs. ft).

IDLER PULLEY AND BRACKET (C/K 2 AND 3 WITH 7.4L ENGINE WITHOUT A/C)
Remove or Disconnect (Figure 32)
1. Negative battery cable.
2. Multiple ribbed drive belt. Refer to “Drive Belt Replacement.”
3. Tensioner bolt.
4. Tensioner.
5. Bracket bolts.
6 . Bracket.

Install or Connect (Figure 32)
1. Bracket to cylinder head holes.
2. Bolts.

Tighten
Bolts to 6 6 N.m (49 Ibs. ft.).
3. Tensioner.
4. Bolt.

Tighten
• Bolt to 50 N-m (37 Ibs. ft.).
5. Multiple ribbed drive belt. Refer to “ Drive Beit Replacement.”
6. Negative battery cable.

 

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