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531 03 06-23
502 52 42-01
6
Dismantle the piston.
Push the gudgeon pin from the piston
using punch 502 52 42-01.
If the pin is too tight, carefully warm the
piston.
Decompression valve
Dismantle the decompression valve.
Decompression valve
Remove the bolt (A) and the hose (B)
that connect the decompression valve
to the nipple on the cylinder.
Unscrew the valve from the cylinder.
Check that the non-return valve (A) is
tight under a vacuum of – 50 kPa.
Otherwise replace the valve.
NOTE!
Turn the valve the right way when
fitting.
Inside the rubber sleeve on the nipple
in the cylinder is a non-return valve (A).
Check with pressure gauge 531 03 06-23.
Pump up a vacuum of – 50 kPa. The
valve must be fully tight. Otherwise
replace the valve.
NOTE!
When the valve is fitted the small
hole must face outwards.
Clean the decompression valve and
check that the valve head is not dam-
aged (burnt) and that the valve oper-
ates easily.
If necessary, grind the valve with fine-
grained valve grinding compound.
Clean the decompression valve with
white spirit or thinner and blow dry with
compressed air.
Check that the valve moves easily in
the guide and that the valve head is not
damaged (burnt).
If necessary, grind the valve into the
seat using fine-grained valve grinding
compound.
Tip!
Use washer no. 502 54 11-01 as a
friction lining against the valve head
when grinding.
Fit the decompression valve in the cylinder.
Cylinder and piston