39MS 461, MS 461-R
Installing
– Lubricate the needle cage with oil
and push it into the connecting
rod.
: Line up the piston so that the
arrow (arrow) on the piston crown
points towards the exhaust port.
The assembly drift (1) can be
pushed through the installed snap
ring.
– Place the piston on the
connecting rod.
: Slide the assembly drift (1)
1108 893 4700, small diameter
first, through the piston and small
end (needle cage) and line up the
piston.
: Lubricate the piston pin (2) with
oil.
: Fit the piston pin (2) on the
assembly drift (1) and slide it into
the piston.
– Prepare snap ring for installation
with installing tool
5910 890 2212.
3443RA132 TG
2
1
Fit the snap ring so that its gap
(arrow) points up.
: Apply installing tool
5910 890 2212 with the sleeve’s
taper (flat facing up) against the
piston boss, hold the piston
steady, center the tool shank
exactly and press home until the
snap ring slips into the groove.
Make sure the tool is held square on
the piston pin axis.
3443RA136 TG3443RA137 TG
– Inspect the piston rings and
replace if necessary, b 6.8
– Install the cylinder, b 6.5
– Reassemble all other parts in the
reverse sequence.
6.8 Piston Rings
– Remove the piston, b 6.7
– Remove the piston rings from the
piston.
: Use a piece of old piston ring to
scrape the grooves (arrows)
clean.
3443RA138 TG3443RA139 TG
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