Ignition - Caution about Spark Plug Wrenches
REF.NO.: 15/51a, 58/53DATE: June 1992
TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
SUBJECT:
ALL MODELS
CHECKING 5/8 IN. (15.8 MM) SPARK PLUG WRENCH SPECIAL TOOL NO. 102 589 02 09 00
Use only spark plug wrench 102 589 02 09 00 with the chamfered-lip retainer magnet (arrow) for removing or installing spark plugs.
The magnet on wrenches delivered before 5/88 do not have a chamfer. Using this wrench can cause damage at the ceramic insulator of the spark plugs. We recommend complete replacement of this spark plug wrench.
Note:
Spark plug wrench part no. 120 589 02 09 00 cannot be used on engines 102 and 103.
There is a 1/2 in drive socket on the top of the spark plug wrench for attaching a torque wrench when torqueing the spark plugs (20 - 30 N-m).
It is also possible to replace only the lower part of the spark plug wrench with a conversion kit consisting of a spark plug socket, spring and pan-head screw.
After modification, change the part number of the spark plug wrench to 120 589 02 09 00.