Connecting Rod Bearing Selection; Crankshaft Main Bearing/Joumal Wear; Checking Crankshaft Clearance Using Plastigage - Triumph Rocket III Classic Service Manual

Note:
• If the measured clearance exceeds the service
limit, measure the crankpin diameter.
Crankpin diameter
Standard 40.946 - 40.960 mm
Service limit
40.922 mm
Note:
• If any crankpin has worn beyond the service
limit, the crankshaft must be replaced. Due to
the advanced techniques used during
manufacture, the crankshaft cannot be re-
ground and oversize bearings are not available.
Connecting Rod Bearing Selection
Note:
• Optimum running clearance is achieved by
using selective big end bearings. For further
information on bearing part number to colour
cross-references, refer to the parts information
system.
Select the correct big end bearing shell as follows:
1.
Measure each crankpin diameter.
2. Select the correct bearings by matching the
information found with the chart below.
Big End Bearing Selection Chart
Shell Colour White
Crankpin 40.960 to
diameter 40.954
For instance:
Crankpin diameter
Required Bearing
Note:
Red
40.953 to
40.946
40.958
White
• Repeat the measurements for all connecting
rods and their respective crankpins. It is normal
for the bearings selected to differ from one
connecting rod to another.
Always confirm, using the Plastigage method, that the
running clearance is correct before final assembly.
Severe engine damage could result from incorrect
clearance, resulting in loss of motorcycle control and an
accident.
Crankshaft
Crankshaft Main Bearing/Journal
Wear
Using selective bearings compensates for minor
differences in crankshaft main bearing journal and
crankcase dimensions. For further information on bearing
part number to colour cross-references, refer to the parts
information system.
1.
Measure the bearing to crankshaft main journal
clearance using Plastigage <Triumph part number
3880150-T0301). Use the same method as described
in connecting rod clearance measurement (See page
5-14>.
Checking Crankshaft Clearance using
Plastigage
2.
Crankshaft main bearing/journal clearance
Standard 0.018 - 0.041 mm
Service limit 0.100 mm
If the clearance exceeds the service limit, measure
the diameter of the crankshaft main bearing journal.
Crankshaft main bearing journal diameter
Standard 43.092 - 43.108 mm
Service limit 43.068 mm
Note:
• If any journal has worn beyond the service
limit, the crankshaft must be replaced. Due to
the techniques used during manufacture, the
crankshaft cannot be re-ground and oversize
bearings are not available.
SelVice Manual- Rocket 1111 Classic 1 Touring
5.15