Stihl TS 420 - 7.7.2 Installation

47TS 410, TS 420
– Heat the area around the bearing
seat to approx. 150 °C (300 °F).
: Press the grooved ball bearing
home as far as possible.
The ball bearing must be fitted
rapidly, as it absorbs heat and
expands.
Clutch-side half of the crankcase
: Carefully drive the oil seal out
with a suitable punch.
: Examine and clean the
crankcase, replace if necessary.
370RA165 TG370RA166 TG370RA167 TG
Fit new grooved ball bearings if the
crankcase is in good condition.
– Heat the area around the bearing
seat to approx. 150 °C (300 °F).
The bearing (1) drops out of its own
accord when this temperature is
reached.
– Heat the area around the bearing
seat to approx. 150 °C (300 °F).
: Press the grooved ball bearing
home as far as possible.
The ball bearing must be fitted
rapidly, as it absorbs heat and
expands.
– Install the crankshaft, b 7.6.1.
– Install the oil seals, b 7.3.
– Reassemble remaining parts in
reverse order.
– Tightening torques, b 3.5.
1
370RA168 TG370RA169 TG
7.7 Piston
7.7.1 Removal
Before removing the cylinder,
decide whether the crankshaft is to
be removed, b 7.6.1.
– Remove the cylinder, b 7.5.
Two snap rings are fitted, but only
one need be removed in order to
remove the piston pin – their
installation is the same on both
sides.
: Pry the hookless snap ring out of
the recess (arrow) on the clutch
side with a suitable tool.
: Fit the assembly drift (1)
1110 893 4700 on the ignition
side.
The assembly drift can be inserted
through the fitted snap ring.
370RA170 TG
370RA171 TG
1