Removing The Piston; Installing The Piston - Stihl MS 500i Service Manual

If necessary, remove the antivibration element from
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the cylinder, @ 17.2.
Remove screws (1).
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Remove cylinder (2).
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Remove gasket (3).
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27.3

Removing the piston

To remove the compression rings (9 and 10), the piston
(4) does not have to be removed.
Remove cylinder, @ 27.2.
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4
When removing the piston (4), the scavenging ramp
(arrow) on the crankcase may be damaged. A damaged
scavenging ramp can result in a serious damage to the
engine.
Remove the piston (4) so that the scavenging ramp
(arrow) on the crankcase is not damaged.
4
Prize the snap ring (5) out at the recess (arrow).
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Drive the piston pin (7) out of the piston (4) with the
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mounting bolt 1108 893 4700.
If the piston pin (7) cannot be pressed out: Hold piston
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(4) against it and knock out piston pin (7) with slight
blows on the mounting bolt 1108 893 4700.
Remove piston (4).
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Pull needle cage (6) out of connecting rod.
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Remove compression rings (9 and 10).
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If the compression rings (9 and 10) are damaged:
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Replace compression rings (9 and 10).
The snap ring (8) does not need to be removed.
MS 500i
7
5
27.4

Installing the piston

Install compression rings (9 and 10).
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Wet the needle cage (6) with oil and push it into the
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connecting rod.
Place the piston (4) on the connecting rod so that the
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arrow on the piston crown (arrow) points in the
direction of the bumper spike.
Push the mounting bolt 1108 893 4700 (12) through
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the hole in the piston (4) and the needle cage (6) in
the connecting rod.
Coat the piston pin (7) with oil.
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Place the piston pin (7) on the pin of the mounting bolt
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1108 893 4700 (12) and push it into the piston (4) as
far as it will go (arrow).
9,10
4
12
7
55