50 TS 410, TS 420
7.8 Piston rings
– Remove piston, b 7.7.1.
– Remove piston rings from piston.
: Use a piece of old piston ring to
scrape the grooves clean
(arrows).
: Align the new piston rings so that
the radii at the ends of the ring
(arrows) face upwards.
370RA183 TG370RA184 TG
: Position the piston rings so that
the radii at the ring gaps meet at
the fixing pins (arrows) in the
piston groove.
: Check the correct installed
position of the piston rings again
(arrows).
– Install the piston, b 7.7.2.
– Reassemble remaining parts in
reverse order.
370RA185 TG
7.9 Decompression valve
– Remove the grommet, b 7.4.
: Unscrew the decompression
valve (1) with socket, 13 mm,
long reach, 5910 893 2804.
: Examine the sealing cone
(arrow) on the decompression
valve for signs of damage.
Use a new decompression valve if
the sealing cone on the
decompression valve does not seal
tightly or is damaged.
– Fit the decompression valve by
hand and screw it in.
– Screw the decompression valve
tight.
– Tightening torques, b 3.5.
– Reassemble remaining parts in
reverse order.
370RA186 TG
1
376RA337 TG
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