S 55 AMG (220.174) V8-5.5L SC (113.991) (2004)
7.
Install shorter belt to bypass the compressor. Route belt as shown in Figure 1.
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Engines M112/113 - 20 x 2315 to 2325 mm (A011 997 96 92)
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Engines M272/273 - 20 x 2330 to 2340 mm (A011 997 04 92)
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.
8.
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.
9.
If the noise is no longer present, allow the engine to cool and proceed to step 10.
10.
Replace the compressor pulley as follows.
Note:
It is not necessary remove the compressor or evacuates the refrigeration circuit.
11.
Remove the poly-V-belt. Determine if the diameter of the pulley is 100 or 110 mm.
12.
Raise the vehicle and remove the lower engine compartment paneling.
13.
Refer to Figure 2 for component number references. Remove the belt pulley circlip (Figure 2, 6). With plastic belt pulleys, it is possible to insert a
screwdriver under the circlip (Figure 2, 6) and pry it out of the groove.