Removing The Engine; Installing The Engine; Disassembling The Engine - Stihl 4180 Series Service Manual

Remove the clutch, @ 9.2.
N
Remove the flywheel, @ 8.2.
N
30
Apply puller 5910 890 4400 (1) with No. 3.1 jaws to
N
oil seal (5) and clamp the arms.
Pull out the oil seal (5).
N
33
Push the installing sleeve 4112 893 2400 (33) onto
N
the crankshaft.
32
5
Lubricate lips of oil seal (5) with multipurpose grease.
N
Push on the oil seal (5) with its open side facing the
N
crankcase.
Use press sleeve 4112 893 2401 (32) to install the oil
N
seal (5).
16.7

Removing the Engine

Remove the shroud, @ 4.2.
N
Remove the rewind starter, @ 5.2.
N
Remove the muffler, @ 14.2.
N
Remove the intake system, @ 10.2.
N
Series 4180 Powerhead
Remove the fan housing, @ 7.1.
N
Remove ground wire, short-circuit wire and throttle
N
cable from the engine, @ 8.8.
Remove the fuel tank, @ 6.8
N
Remove the clutch, @ 9.2.
N
Remove the flywheel, @ 8.2.
N
Remove the ignition module, @ 8.6
N
Remove the starter cup (4).
N
Disassemble the engine if necessary, @ 16.9.
N
16.8

Installing the Engine

Assemble the engine, @ 16.9.
N
Install the muffler, @ 14.2.
N
Install the starter cup (4).
N
Install the fuel tank, @ 14.2.
N
Install the flywheel, @ 8.3.
N
Install the ignition module, @ 8.7
N
Adjust valve timing, @ 15.2
N
Install the clutch, @ 9.5.
N
Assemble the intake system, @ 10.2.
N
Fit ground wire, short-circuit wire and throttle cable on
N
the engine, @ 8.11.
Install the fan housing, @ 7.3
N
Install the shroud, @ 4.5.
N
16.9

Disassembling the Engine

Valve timing gets out of adjustment when the crankshaft
is removed, @ 15.2.
Unscrew the screws (8) and remove them together
N
with the engine pan (7).
Pull out the crankshaft (6) together with the piston (2).
N
Remove the oil seals (5).
N
10
Ease snap ring (10) out of groove at recess.
N
45