Stihl MS 231 Manual page 80

1
2
: Pull the worm (1) with drive
spring (2) out of the oil pump.
– Check the spring and worm and
replace if necessary.
1 3
2
: Take out the screw (1), lift the oil
pump (2) and push the hose (3)
out of its seat (arrow).
1
2
: Pull the oil pump (1) off the oil
suction hose (2).
MS 231, MS 231 C, MS 251, MS 251 C
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: Pull the hose (1) off the nipple.
– Check the oil pump and replace it
if necessary
Installing
: Position the hose (1) so that the
ribs (arrows) are in alignment.
: Position the oil suction hose (1)
so that the straight sides of the
lugs (arrows) locate against the
engine housing.
: Push the oil suction hose (1) onto
the nipple.
1
1
: Place oil pump (1) in position and
push the tube (2) into its
seat (arrow) until it is flush with
the engine housing.
: Fit the screw (3)
and tighten it down firmly.
– Push the worm home as far as
stop – it must rotate freely.
1
1
: Push the washer (1) into position.
Installed position is correct when
"TOP" (arrow) faces outwards.
– Reassemble all other parts in the
reverse sequence.
1
3 2
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