38 MS 461, MS 461-R
Installing
As the bearing seat in the clutch half
of the crankcase has no locating
face, the oil pump must be installed
first – it serves as the locating face.
– Install the oil pump, b 11.3
– Heat area of bearing seat to
about 160°C (320°F).
– Position the ball bearing so that
the centering ring (arrow) points
toward the oil pump.
: Push the ball bearing home as far
as stop (oil pump).
This operation must be carried out
quickly because the bearing
absorbs heat and begins to expand.
– Check that the bearing is properly
seated. If necessary, use press
arbor 1118 893 7200 to carefully
press home the bearing until it
butts against the oil pump.
– Remove the oil pump and
lubricate the pump piston,
b 11.3
– Install the crankshaft, b 6.6
– Install the oil seals,
b 6.3
– Reassemble all other parts in the
reverse sequence.
3443RA127 TG
6.7 Piston
Before removing the cylinder,
decide whether or not the
crankshaft has to be removed as
well, b 6.6
– Remove the cylinder, b 6.5
It is not necessary to remove the
snap ring at the clutch side.
: Pry hookless snap ring out of
boss at ignition side – apply tool
to recess (arrow).
: Slide the assembly drift (1)
1108 893 4700 through the
installed snap ring.
: Use the assembly drift (1)
1108 893 4700 to push the piston
pin (2) out of the piston.
3443RA128 TG3443RA129 TG
1
2
If the piston pin is stuck, release it
by tapping the end of the drift lightly
with a hammer.
Hold the piston steady during this
process to ensure that no jolts are
transmitted to the connecting rod.
– Remove the piston.
– Inspect the piston rings and
replace if necessary, b 6.8
: Pull out the needle cage (1),
check it and replace if necessary.
1
3443RA130 TG
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