10
11
12
Replacing cylinder liners
128
Fig. 10
Insert new O-rings for the lower seal (144x4) dry
into the crankcase.
Fig. 11
Insert new O-rings for the upper seal (138x2) into
the cylinder liner grooves.
Do not overstretch the O-rings.
Note:
Do not use grease or sealing compounds
of any type to install the cylinder liners
and O-rings.
Fig. 12
Apply a thin coat of engine oil to the cylinder liner
in the upper and lower O-ring areas.
Apply a thin coat of engine oil to the lower O-rings
in the crankcase.
Insert the liners into the crankcase and press them
in with both hands.
Then place a clean metal plate on the liner and
exert uniform and downward pressure until the
liner is seated in the crankcase recess.
Note:
To verify that the O−rings are correctly
seated after the cylinder liners are fitted,
check the liner protrusion with special
tool, as follows:
Position the press-on measuring plate
with turned collar facing the liner, using 2
fitting sleeves to centre the plate.
Fit press−on measuring plate with 4 bolts
(own manufacture: Collar screw
51.90020−0270, length shortened to 90
mm) in stages in diagonal sequence with
40 Nm.
Set the dial gauge combination to “0”
over the measuring plate under preload
relative to the crankcase.
Measure the liner protrusion at no less
than 4 different points.
If noticeable resistance can be felt during this pro-
cedure, the O-rings are no longer in their proper
position.
Check O-rings for damage; if necessary, replace,
rearrange and reinsert the cylinder liner.
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