Engine - Sporadic Rattling Noises On Engine Start Up
Date: January 23, 2009Order No.: S-B-05.20/20b
Supersedes: P-B-05.20/20a and T-B-05.20/21a dated December 21, 2007
Group: 05
Revision History
Revision Date Purpose
b 1/23/09 Applicable Models Updated and Technical Content Updated
a 12/21/07 Applicable Models and Warranty Information Updated
- 01/04/07 Initial issue
SUBJECT:
Model 164.177
Model 204.077
Model 209.377/477
Model 211.077/277
Model 216.377
Model 219.377
Model 221.177
Model 230.470
Model 251.177
AMG Vehicles Equipped with Engine M156
Sporadically Occurring Noise on Engine Start in Area of the Chain Drive
If you receive customer reports in the above model vehicles of a sporadically occurring noise when first starting the engine, this may be due to the intake camshaft adjusters or valve tappets. Use the following sound recordings to assist in fault tracing.
Camshaft Adjuster Sound Recording
^ Rattling sound with one malfunctioning camshaft adjuster.
^ Rattling sound with two malfunctioning camshaft adjusters.
Valve Tappets Sound Recording
^ Clattering noise/valve tappets.
Models 209, 211 and 219, Equipped with M156 Engine up to Serial Number 60 001177:
For vehicles with camshaft adjuster rattling sound, replace the intake camshafts and intake camshaft adjusters, use repair kit A156 060 3147. Refer to WIS document number AR05.20-P-6992AMG. The exhaust camshaft adjuster should not require replacement on this range of engines unless confirmed to be noisy.
Note:
It is essential to replace both the intake camshafts and intake camshaft adjusters. Holding device part number W156 589 00 61 00 and locating plate part number W156 589 00 32 00 are absolutely necessary to perform this repair.
Vehicles Equipped with M156 after Serial Number 60 001178:
Remedy 1:
For vehicles with camshaft adjuster rattling sound, replace the camshaft adjuster(s) found noisy. For testing and repair information refer to WIS Group 05.20.
Note:
Even if only one camshaft adjuster is replaced it is absolutely imperative to set cam timing on both cylinder banks. Repair kit A156 050 31 47 should not be used for engines after the serial number break. Order individual parts as needed.
Remedy 2:
For vehicles with valve tappet(s) sound, replace valve tappet(s) found noisy. For testing and repair information refer to WIS Group 05.20
Special Tools
Parts Information
Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on January 23, 2009. Please refer to Netstar --> Star TekInfo --> Star Time for the most current labor time allowance.
In Case of Warranty, use the table above.