CL 550 (216.371) V8-5.5L (273.961) (2008)
Engines M112/113/272/273
5. Remove the poly-V-belt from the refrigerant compressor.
6. Install shorter belt to bypass the compressor. Route belt as shown in Figure 1.
Engines M112/113 - 20 x 2315 to 2325 mm (A011 997 86 92 or A 011 997 96 92)
Engines M272/273 - 20 x 2330 to 2340 mm (A011 997 04 92)
Note:
A short test belt for OM642 is currently not available.
Note:
The belts can be sourced locally or by MB part number. The belts must be purchased to diagnose AC compressor pulley noise and are not to be
submitted on a warranty claim.
7. Run the engine with the short belt installed. If the noise is still present, check whether the tensioner and/or guide pulleys are the source of the noise.
Replace as necessary the defective tensioner and/or guide pulleys.
8. If the noise is no longer present, allow the engine to cool and proceed to step 10.
9. Replace the compressor pulley as follows.
Note:
It is not necessary to remove the compressor or evacuate the refrigeration circuit. Refer to WIS document AR83.55-P-7685B
10. Remove the pulley-V-belt. Determine if the diameter of the pulley is 100 mm or 110 mm.
11. Raise the vehicle and remove the lower engine compartment paneling.