Check Engine Belts—Replace as Required


Inspect Serpentine Belt

CAUTION: Shut off engine and remove key before inspecting or replacing belt.

Daily inspections can be done without removing shields or guards.

E69367
E69367-UN-28JAN13

W150 Shown, W110 Similar

A - Serpentine Belt

Inspect serpentine belt (A) daily for intersecting cracks. Traverse (across the belt width) cracks are acceptable. Longitudinal (direction of belt length) that intersect with traverse cracks are not acceptable. Replace belt if it is frayed or pieces of material are missing.

Belt damage can be caused by the following;

  • Incorrect tension
  • Incorrect size or length
  • Pulley misalignment
  • Incorrect installation
  • Severe operating environment
  • Oil or grease on belt

Inspect Air Conditioning Compressor Belt

E69368
E69368-UN-30JAN13

W150 Shown, W110 Similar

A - Air Conditioning Compressor Belt

Inspect compressor belt daily for cracks, fraying and proper alignment. Replace as required. (See procedure in this section.)


Removing and Installing Serpentine Belt

  1. E69370
    E69370-UN-28JAN13

    W150 Shown, W110 Similar

    A - Breaker Bar

    B - Belt

    Shut off engine and remove key.


  2. Raise hood.

  3. Remove air conditioning compressor belt. (See procedure in this section.)

  4. Rotate belt tensioner using 1/2 in. breaker bar (A) and remove belt (B) from around pulleys and fan.

  5. Install replacement belt in reverse order of removal.

  6. Verify belt is seated in sheave grooves.

  7. Install air conditioner compressor belt in reverse order of removal.


Removing and Replacing Air Conditioner Compressor Belt

  1. E69369
    E69369-UN-28JAN13

    W150 Shown, W110 Similar

    A - Cap Screw

    B - Cap Screw

    C - Belt

    Shut off engine and remove key.


  2. Raise hood.

  3. Loosen cap screws (A) and (B). Rotate compressor to relieve tension on belt.

  4. Remove belt from sheaves.

  5. Install replacement belt in sheaves.

  6. Pry compressor away from engine until belt tension and deflection (at mid-span) are within specifications.

    ItemMeasurementSpecification
    Air Conditioning Compressor BeltForce35—55 N (8—12 lb.)
    Deflection5 mm (3/16 in.)

  7. Tighten compressor mounting hardware.

OUO6043,00001FA-19-20130215