Triumph Daytona 955i, Service Manual

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The top ring upper surface is marked `N' and can
be identified by a chamfer on the inside edge.
The top ring has a shiny grey appearance.
The second ring upper surface is also marked
'N' but is plain on the inside edge and has a
bronze appearance.
The oil control rings can be fitted with either
face upward.
Top Ring
N Mark
Second Ring
2
N Mark
6 CRANKSHAFT/RODS/PISTONS
Piston Ring to Ring Groove Clearance Check
Piston ring/Groove Clearance — both engines
Top
0.02 — 0.06 mm
Second
0.02 — 0.06 mm
Piston Ring Gap
Piston Ring End Gap Tolerances — 885cc engine
Top 0.15 — 0.30 mm
Second 0.26 — 0.41 mm
Oil Control 0.20 — 0.70 mm
Piston Ring End Gap Tolerances — 955cc engine
Top 0.15 — 0.30 mm
Second 0.30 — 0.45 mm
Oil Control 0.20 — 0.70 mm
4. 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.
Piston Assembly
1. Clean the piston ring grooves and fit the piston
rings to the piston.
NOTE:
NOTE:
•
• 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.
gagl
Aligning Piston Rings using the Piston
3. Remove the piston and measure the gap between
the ends of the piston ring using feeler gauges.
Piston Ring Identification
6.20