Stihl MS 661 Manual page 96

1
: Pull the worm (1) with drive
spring (2) out of the oil pump.
– Check the spring and worm and
replace if necessary.
1
2
: Take out the screws (1) and
remove the oil pump (2).
: Remove the sealing ring (1).
– Check the oil pump and replace it
if necessary
MS 661, MS 661 C-M
Installing
2
: Fit a new sealing ring (1) in the
bore (arrow).
4
5
3
1
2
: Line up the oil pump (1) so that
the stub (2) engages the oil
suction hose (3) and stub (4)
slips into the sealing ring (5).
– Coat stubs and sealing ring with
STIHL press fluid, b 16
1
2
1
1
: Push oil pump (1) into position as
far as stop.
: Fit the screws (2)
and tighten them down firmly.
– Push the worm fully home.
1
1
: Push the cover washer (1) into
position.
Installed position is correct when
"TOP" (arrow) faces outwards.
– Reassemble all other parts in the
reverse sequence.
2
95