MOTO GUZZI V11 SPORT Werkstatt-Handbuch Seite 306

A
B
C
D
E
Ø
PISTON PIN
mm
21,994
F
21,998
G
H
I
L
M
N
O
P
48
COUPLING DATA
BACKLASH BETW.
Ø PISTON
PIST. PIN AND HOLES
HOLES
ON THE PIST. mm
mm
22,006
0,008÷0,017
22,011
A
1,52÷1,54
3,02÷3,04
22,006÷22,011
Piston check:
During overhaul, descale the crown, the pistons and the
seats for the flexible rings; check the backlash between
the cylinders and pistons on the selection diameter; if this
exceeds the prescribed value, the cylinders and the
pistons must be replaced.
The engine pistons must be balanced; a weight difference
of 1.5 grams is acceptable.
Check the compression and oil scraper rings.
The following is fitted on each piston:
• 1 upper compression ring;
• 1 intermediate stepped compression ring ;
• 1 oil-scraper compression ring.
The end parts of the compression rings must be fitted
"out of step" with each other.
Assembly backlashes measured between the ring shims
and their seats on the piston;
• Seal and oil-scraper rings 0.030 ÷ 0.065 mm
Span between the ends of the compression rings fitted in
the cylinder:
• Upper seal ring and stepped ring 0.40 ÷ 0.65 mm.
• Oil scraper ring 0.30 ÷ 0.60 mm.
Reassembly
• Carry out the disassembly procedures in reverse order.
N.B.
Check the assembly direction for the piston: the
arrow "A" marked on the crown indicates the
exhaust side.
Check that the pistons and the cylinders are in
the correct group categories (A with A, B with B,
C with C);
Do not couple pistons and cylinders which do
not belong to the same selection group.
2,975÷2,990
ø92
57,9÷58,1
ø21,994÷ø21,998
E
1,475÷1,490
0,40÷0,65
0,30÷0,60
NGINE