S-Type (X200) V8-4.2L (2005)
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Drive Belt: All Technical Service Bulletins
Engine - Drive Belt Noise Diagnosis
S-TYPE
S100-18
DATE: 07/05
MODEL:
2003 MY-ON
S-TYPE
VIN:
M44998-ON
Engine Drive Belt - Noise Issues - Diagnosis
Issue:
This bulletin has been issued for information only, to assist dealers in diagnosing the cause of engine drive belt noise issues.
Action:
Obtain the following useful information prior to investigating the issue:
1.
The customer description of the issue including the type of noise, when it happens, how long it lasts, is it related to external temperature, does it
only happen on engine start-up or is it constant?
2.
The vehicle history - has a belt noise been reported in the past? Is it the same issue that is being reported now? What repairs were conducted
during the previous visit?
Carry out the following checks before starting the engine:
Note:
The checks below should help identify drive belt contamination or system alignment problems.
3.
Are there any coolant/oil leaks onto the drive belt?
4.
Is there any other contamination on the drive belt?
5.
Is there any drive belt dust or debris visible?
6.
Does the drive belt have frayed edges?
7.
Are there any other wear marks on the drive system or drive belt?
8.
Are there any loose components?
9.
Are any brackets or components obviously out of alignment?
10.
Are there any signs that there is run out in the pulleys or components?
11.
Is the drive belt tension correct?
Caution:
Before removing a drive belt, mark the direction of rotation, and ideally belt position, on the belt so that it can be reinstalled in the same
orientation.
If the vehicle is supercharged (SC) it will be necessary to determine which of the drive belt systems is causing the noise. One way to do this is to
remove the SC belt then briefly run the engine. If the noise stops then the SC system is the source, if the noise continues it is caused by the
auxiliary drive system.
Carry out the following checks with the engine running:
Note:
