Mercedes-Benz 201.024, Service Manual

Page: 82 / 304

2 Pack grooves of the combination tap (9) of
the tapping unit (1, ill. note) with grease and
screw combination tap into the damaged thread.
At the same time, press the guide bush (11) into
the spark plug recess. Screw in combination tap
far enough for the guide tube (12) to move up
and be touching the stop ring (10).
Caution!
If the cylinder head is installed, unbolt
combination tap after approx. each five turns,
clean grooves of swarf and grease and again
pack with grease.
3 Check length of the HELI-COIL thread insert
Use only the HELI-COIL inset-t with 9.1 mm
block length.
4 Install HELI-COIL thread insert. To perform
this step, insert HELI-COIL insert (8) into the tool
(2, ill. note) so that the bar (arrow) of the insert
is facing the preload cartridge (16).
Turn HELI-COIL insert with the turning spindle
(13) far enough through the preload cartridge
until the bar (arrow) is flush with the face of the
preload cartridge.
01.0904 .