Pistons; Disassembly; Piston Wear Check - Triumph Rocket III Classic Service Manual

Pistons
Disassembly
1.
Remove the cylinder head and liners (see page 3-
20>.
• •
~l.Ition
The cylinder liners and pistons are made of aluminium
alloy and can therefore be easily damaged. Handle the
cylinder liner and piston with care, ensuring the internal
bore of the liner and the piston skirt are not scratched.
Note:
•
It is not necessary to remove the connecting
rods from the crankshaft, but the piston should
be at the top of its stroke.
2.
Remove the gudgeon pin circlip from one side of the
piston.
1.
Gudgeon pin circlip
3. Remove the gudgeon pin by pushing the pin
through the piston and rod toward the side from
which the circiip was removed.
Note:
• If the gudgeon pin is found to be tight in the
piston, check the piston for a witness mark
caused by the circlip. Carefully remove the
mark to allow the pin to be removed.
4. With the gudgeon pin removed, the piston can be
detached from the con-rod.
5. Remove the piston rings.
Crankshaft
Note:
•
The rings may be removed using a proprietary
piston ring expander tool or, if a tool is not
available, carefully spread the ring opening
using thumb pressure then push up on the
opposite side of the ring to remove it from the
piston .
Piston Wear Check
1.
Measure the piston outside diameter,
10
mm up
from the bottom of the piston and at
90°
to the
direction of the gudgeon pin.
3
cbxv
1.
Piston outside diameter
2. Measurement point (10 mm up the piston skirt>
3. Gudgeon pin
Piston outside diameter at 90° to gudgeon pin
All cylinders
101.561 - 101.577
mm
Service limit
101.511
mm
Replace the piston if the measured diameter falls
outside the specified limit.
SelVice Manual - Rocket Ill/ Classic / Touring
S.17