Engine - Noise From Poly-V Belt

NOISE FROM POLY-V BELT

Topic Number LI13.22-P-047847

Version 3

Design Group 13.22 Single-belt drive

Date 09-02-2009

Validity 164.177
204.077/277
209.377/477
211.077/277
219.377
251.077/177

Reason for change

Reason for block

Complaint:

Noises from the drive belt could be caused by damage to the grove of the poly-0V-belt on the engine side. the damage may occur from belt vibrations during extreme sporty driving. to remedy, install an additional guide pulley and a new poly-V-belt as per the procedure below.

Poly-V belt makes noises

NOTE:
The groove in the Poly-V-belt on the engine side may be damaged.

Cause:

Belt vibrations during extreme sporty driving.

Remedy:

Additional poly0V-belt guide pulley was phased into production as of engine number 15698X 60 026271, together with modified timing case cover.

1. Remove the poly-V-belt. Refer to WIS documents AR13.20-P-0001*MG (*-refers to a different model)

2. The additional poly-V-belt guide pulley (Figure 1) must be installed below the belt tensioner in the location as illustrated on Figure 2

3. Remove existing screws from locations 2 and 3, Figure 3.

4. Place the additional pulley holder (Figure 3, 1) as illustrated and attached with two screws:

a. Attach shorter M8 x 55 screw (Figure 3, 2) on the top as illustrated and torque it to 20 Nm

b. Attach longer M8 x 110 screw (Figure 3, 3) on the bottom as illustrated and torque it to 20 NM

5. Install additional pulley (Figure 4, 5) by securing it with the torx head bolt (Figure 4, 6) and screwing it into the hole (Figure 3, 4). torque the pulley bolt to 30 Nm.

NOTE:
The hole for additional poly-V-belt guide pulley (Figure 3, 4) is not tapped (threaded). The bolt (Figure 4, 6) fastening the pulley must be forced screwed (self-tapped) into the hole. Make sure to center the bolt in the pulley.

6. Cover the torx bolt with the cap (Figure 4, 7).

7. Install the new poly-V-belt as per parts information. Refer to WIS documents as in step 1.

8. Check for a proper installation.

NOTE:
Always refer to EPC for the latest parts information and use the correct VIN number when specifying parts. Please note the the Additional Poly-V-Belt Guide Pulley Installation Kit - A156 202 00 40 - is an AMG part and it can not be obtained through the parts system. dealers must call TAC and the kit will be provided through MBUSA service Engineering.