Crankshaft; Replacing The Oil Seals - Stihl 4180 Series Manual

7.8

Crankshaft

7.8.1

Replacing the Oil Seals

It is not necessary to disassemble
the engine to replace the oil seals.
Starter side
– Remove the rewind starter,
b 5.2
1
– Use combination wrench
4180 890 3400 to remove the
spark plug. Fit locking screw
(1) 4180 890 2700. Rotate
crankshaft counter-clockwise
until the piston butts against the
locking screw.
Series 4180 Powerhead
1
2
: Remove the hex. nut (1).
: Remove the starter cup (2).
: Apply puller 4112 890 4400 (1)
with No. 3.1 jaws and clamp the
arms.
– Pull out the oil seal.
Take care not to damage the
crankshaft stub.
Installing oil seal at starter side
– Inspect crankshaft running face
for scores.
– Clean sealing face in crankcase.
– Lubricate sealing lips of oil seal
with grease, b 12
– Apply a thin coating of sealant to
the outside diameter of the oil
seal, b 12
1
1
: Slip installing sleeve
4112 893 2400 (1) over the end
of the crankshaft.
: Push on the oil seal as far as the
crankcase.
: Note the installed position:
Closed side of the oil seal (1)
must face rewind starter.
1
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