300SDL (126.125) L6-3.0L DSL Turbo (603.961) (1987)
Timing Chain Tensioner: Technical Service Bulletins
Timing Chain Tensioner - New Torque & Modified O-ring
TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
DATE: September 1993
REF.NO. 05/89
SUBJECT:
Modified Seal Ring For Timing Chain Tensioner Housing
Engines 601, 602, 603
Figure 1
Figure 2
As of February 1993, a modified seal ring, part no. 007603 027101, which provides a better oil seal for the timing chain tensioner housing was phased
into production.
The previous version seal ring was installed from October 1991 to January 1993.
Effective Serial Number Range
Model
Engine
Chassis End Number
From
To
124
602
B 622 595
B 929 761
140
603
A 029 436
A 125 110
The modified seal ring can be retrofitted to the above-listed engines.
The torque specification for the timing chain tensioner housing has been increased to 80 Nm for both version seals to ensure proper sealing.
The affected vehicles should have the timing chain tensioner housing re-torqued to 80 Nm during the next dealer visit.