Stihl MS 231 Manual page 81

11.4 Valve
A valve is installed in the tank wall to
keep internal tank pressure equal to
atmospheric pressure. The valve
must be replaced if it is faulty.
– Open the oil tank cap and drain
the oil tank b 1.
: Use a thin drift to carefully drive
the valve out of the housing from
inside the tank.
Installing
Check correct installed position.
: Insert the valve in the housing
bore (arrow).
– Use a 6 mm drift to carefully
drive in the new valve from
outside – note installed depth.
80
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: Drive the new valve into the bore
to a depth of 1 +/- 0.1 mm (a).
– Reassemble all other parts in the
reverse sequence.
MS 231, MS 231 C, MS 251, MS 251 C