ML 63 AMG (164.177) V8-6.3L (156.980) (2007)
Variable Valve Timing Actuator: Customer Interest
Engine - Sporadic Rattling Noises On Engine Start Up
Date: January 23, 2009
Order 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.