Stihl 4180 Series - 16.10 Assembling the Engine

Series 4180 Powerhead46
N Apply assembly drift 1110 893 4700 to other side of
piston (1) ad push out the piston pin (11).
N Lift away the piston (2).
16.10 Assembling the Engine
N Fit piston rings (1) on piston (2) so that their gaps are
offset 120 degrees.
N Coat plain bearing in connecting rod with oil.
N Fit piston (2) on the connecting rod so that the
indentation (arrow) in the piston crown faces the
spark plug.
N Insert the assembly drift 1114 893 4700 (30), small
diameter first, in the piston boss and align the piston
(2).
N Fit the piston pin (11) on the assembly drift 1114 893
4700 (30). Slide the assembly drift 1114 893 4700
(30) with the piston pin into the piston (2).
N 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.
N Push the oil seals (5) onto the crankshaft (6), making
sure that their closed sides face outwards.
N Coat piston (2), piston ring (1) and inside of cylinder
(12) with oil.
N Fit the piston (2) with crankshaft (6) in the cylinder so
that the indentation in the piston crown faces the
spark plug.
N Coat sealing face on engine pan (7) with Dirko
sealant.
N Place the engine pan (7) on the cylinder (12).
N Insert and tighten down the screws (8) alternately in
crosswise pattern.
N Install the powerhead, @ 16.7.
3011
0000-GXX-2349-A00000-GXX-2350-A0
30
0000-GXX-2351-A0
1
10
2
3 4
0000-GXX-2833-A0
5
5
0000-GXX-2366-A0