190E 2.6 (201.029) L6-2.6L (103.942) (1987)
Valve Train Noise Due to Stretched Timing Chain
2.
ENGINES 102.961/985 VALVE TRAIN NOISE DUE TO STRETCHED TIMING CHAIN
Several production changes were phased-in over a period of time, with the most recent being the change from a single roller timing chain to a double
roller timing chain.
Effective Serial Number Range
Model
Transmission
Engine End Number
Chassis End Number
Month/Year
201.028
Automatic
067143
468003
January 1988
Manual
022013
468933
February 1988
Note:
In addition to the timing chain, many other parts have been modified. Therefore, conversion from a single roller timing chain to a double roller timing
chain is not recommended on previously manufactured engines.
In case of a verified customer complaint regarding engine noise caused by a stretched single roller timing chain, install the notched single roller timing
chain with barrel-shaped roller sleeves. At the same time, inspect the chain tensioner as described in the W.I. 222 Grp. 05.
If the chain tensioner is okay (thrust pin not seized) or after installation of a new timing chain (chain tensioner functional); and valve train noise during
starting of the engine persists, install modified chain tensioner (part no. 102 050 19 11 05).
Other Production Change Phase-Ins
Date
Production Change