Triumph Speed Triple Service Manual page 91

Crankshaft, Connecting Rods and Pistons
(
Piston RingsIRing Grooves
Check the pistons for uneven groove wear by visually
inspecting the ring grooves.
If all the rings do not fit parallel to the groove upper
and lower surfaces, the piston must be replaced.
Clean the piston ring grooves.
Fit the piston rings to the pistons. Check, using feeler
gauges, for the correct clearance between the ring
grooves and the rings. Replace the piston and rings if
outside the specified limit.
Piston Ring to Ring Groove Clearance Check
Piston ring1Groove Clearance
Piston Ring Gap
Top ring
Service limit
Second
Service limit
Note:
0.02
-
0.06
mm
0.075 mm
0.02
-
0.06
mm
0.0.75
mm
*
Before final assembly the piston ring gap,
when fitted in the liner, must first be
checked.
1 .
Place the piston ring inside the liner.
2 .
Push the ring into the top of the cylinder, using
the piston to hold the ring square with the inside
of the bore. Continue to push the ring into the
bore until the third groove of the piston is level
with the cylinder top, around full circumference of
cylinder.
Aligning Piston Rings using the Piston
.I.
Remove the piston and measure the gap
between the ends of the piston ring using feeler
gauges.
Piston Ring End Gap Tolerances
I
TOP
0.28
-
0.49
mm
I
Service limit
1
0.61
mm
Second
1
0.43
-
0.64 mm
Service limit
0.76
mm
I
Oil Control
1
0.33
-
0.89
mm
2 .
If the ring gap is found to be too small, the ring
end must be carefully filed until the correct gap is
achieved. If the gap is too large, replace the
rings with a new set. If the gap remains too large
'with new rings fitted, both the piston and liner
must be replaced.
Service limit
Sewice Manual
-
Speed Triple
1.03 mm