Valve; Cleaning; Replacing - Stihl MS 440 Service Manual

1 2
: Pull the pickup body (1) off the
suction hose (2).
Reassemble in the reverse
sequence.
: Insert the suction hose in the
crankcase.
– Lubricate grommet with a little oil.
: Use a blunt tool to push the
suction hose into the crankcase
so that the tab locates in its seat
at the bottom right (arrow).
MS 440, MS 440 C
11.2

Valve

11.2.1 Cleaning

A valve is installed in the tank wall to
keep internal tank pressure equal to
atmospheric pressure.
Valve cleaning
– Remove the oil tank cap.
– Drain the oil tank.
Collect chain oil in a clean container
or dispose of it properly at an
approved disposal site.
– Remove the inner side plate –
b 5.4.2
1
: Blow the valve (1) clear with
compressed air (from outside to
inside of tank).
– Flush out the oil tank.
– Fit the inner side plate – b 5.4.2
– Screw in the oil tank cap.

11.2.2 Replacing

– Remove the oil tank cap.
– Remove the inner side plate –
b 5.4.2
: Use a 5 mm (0.20 in) drift to
carefully drive the valve out of its
seat from the inside of the tank.
: Use a 7 mm (0.28 in) drift to
carefully press home the valve
from outside until it is about
a = 1 mm (0.04 in) below the
housing face.
Reassemble all other parts in the
reverse sequence.
a
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