Dismantling of engine shutdown
device: (from engine serial numbers
L 30.15, 2 L 40.12, 3/4 L 40.11).
– Remove the locking device.
Attention:
The piston with tensioning roller are
spring-loaded; release the spring loading
gradually.
– Take out circlip (152/1).
– Unscrew the nut (151/1) and take out
the machine screw (151/2) with sleeve
(151/3) and washers (151/4) and
(151/5) at the same time forcing the ten-
sioning roller (151/6) back slightly
against its spring loading.
– Carefully release the spring loading
completely and pull out the piston
(152/3) with spring (152/6) and filler
(152/7).Remove the support disc
(152/2) and quad ring (152/4) from the
housing.
– Take the restrictor screw (153/1) out of
the back of the housing.
– Press the shaft out of the piston and
remove the tensioning roller.
– Take off the Nilos rings (151/8). Drive
the ball bearings (151/9) out towards
the outside in each case, since a circlip
(151/10) is installed between them.
– Take out the support disc (151/11).
Checking the parts:
– Check the piston for the tensioning rol-
ler and the bushings in the housing for
score- or wear-marks. If damaged, re-
new the bushings or the piston.
To renew the bushings, use special
tools - 20 - 21 - and press the bushings
in as shown in Fig. 174.
– Check the tensioning roller ball bearing
and renew if necessary.
– Renew quad rings (152/4) and (152/5).
– Renew the tensioning roller or belt pul-
ley if any grooves are damaged or ribs
broken off.
– Check that the bore in the restrictor
screw is not blocked.
3
L / M . . 09.96
151
174
152
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