46 Series 4180 Powerhead
: Indentation (arrow) in piston 
crown faces the spark plug hole.
VA
: Use the assembly drift 
1114 893 4700 to push the piston 
pin through the piston and 
connecting rod.
VA
Piston pin with diameter of 8 mm 
Use installing tool 5910 890 2208 to 
fit the snap ring, b
11 
Installing tool 5910 890 2208 must 
be equipped with sleeve 
5910 893 1703. 
Piston pin with diameter of 9 mm 
VA
Use installing tool 5910 890 2209 to 
fit the snap ring, b
11 
: Remove sleeve from the tool.
: Attach the snap ring (1) to the 
magnet (2) so that the snap ring 
gap is on the flat side of the tool’s 
shank.
VA
2 1
: Push the large slotted diameter of 
the sleeve over the magnet and 
snap ring. 
The inner pin (1) must point 
towards the flat face (2) of the 
tool's shank.
2 1
: Stand the installing tool, sleeve 
downward, on a flat surface 
(wooden board) and press 
vertically downwards until the 
sleeve butts against the tool’s 
shoulder.