16.10 Assembling The Engine - Stihl 4180 Series Service Manual

11
Apply assembly drift 1110 893 4700 to other side of
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piston (1) ad push out the piston pin (11).
Lift away the piston (2).
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16.10 Assembling the Engine

Fit piston rings (1) on piston (2) so that their gaps are
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offset 120 degrees.
Coat plain bearing in connecting rod with oil.
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Fit piston (2) on the connecting rod so that the
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indentation (arrow) in the piston crown faces the
spark plug.
Insert the assembly drift 1114 893 4700 (30), small
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diameter first, in the piston boss and align the piston
(2).
Fit the piston pin (11) on the assembly drift 1114 893
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4700 (30). Slide the assembly drift 1114 893 4700
(30) with the piston pin into the piston (2).
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1
30
3
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30
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2
10
4
Use installing tool 8 – 5910 890 2208 (8mm piston
pin) or installing tool 9 – 5910 890 2209 (9mm piston
pin) to fit the snap ring (10) in the piston (2). The gap
in the snap ring (10) must face either up or down.
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Push the oil seals (5) onto the crankshaft (6), making
sure that their closed sides face outwards.
Coat piston (2), piston ring (1) and inside of cylinder
(12) with oil.
Fit the piston (2) with crankshaft (6) in the cylinder so
that the indentation in the piston crown faces the
spark plug.
Coat sealing face on engine pan (7) with Dirko
sealant.
Place the engine pan (7) on the cylinder (12).
Insert and tighten down the screws (8) alternately in
crosswise pattern.
Install the powerhead, @ 16.7.
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Series 4180 Powerhead