Stihl TS 420 - 7.4 Removing and installing the shroud

36 TS 410, TS 420
7.3 Oil seals
It is not necessary to dismantle the
complete shortblock if only the oil
seals need to be replaced.
Ignition side
: Take out the screws (arrows).
– Remove fan cover (1).
– Remove the flywheel, b 8.5.
– Free off the oil seal in its seat by
tapping it with a suitable tube or
a punch.
: Apply the puller (1)
5910 890 4400 with jaws (profile
No. 3.1) 0000 893 3706.
– Clamp the puller arms.
– Pull out the oil seal.
1
370RA096 TG
370RA097 TG
1
Avoid damage to the crankshaft
stub.
– Clean the mating surfaces,
b 14.
– Grease the sealing lips of the
new oil seal, b 14.
– Thinly coat the outer
circumference of the oil seal with
sealing compound, b 14.
– Slip the oil seal with the open side
facing the crankcase over the
crankshaft stub.
: Press the oil seal (2) in with press
sleeve (1) 4238 893 2400.
The seating face must be flat and
free from burrs.
– Turn the crankshaft through
several times after approx.
1 minute.
– Clean the cone of the crankshaft
to ensure it is completely grease-
free, b 14.
– Reassemble remaining parts in
reverse order.
370RA098 TG
1
2
Clutch side
– Remove cast arm with guard,
b 5.2.
– Remove the clutch, b 6.
– Remove the clutch drum, b 6.1.
– Free off the oil seal in its seat by
tapping it with a suitable tube or a
punch.
: Apply the puller (1)
5910 890 4400 with jaws (profile
No. 3.1) 0000 893 3706.
– Clamp the puller arms.
– Pull out the oil seal.
Avoid damage to the crankshaft
stub.
– Clean the mating surfaces,
b 14.
– Grease the sealing lips of the
new oil seal, b 14.
370RA099 TG
1