Crankshaftmain Bearing/Journal Wear - Triumph DAYTONA 675 Service Manual

Crankshaft, Connecting Rods and Pistons
Crankshaft main bearing/journal wear
White
Shell Colour
Crankcase 35.982
Bore
35.973
Journal Dia. 33.000
32.993
0.044
Running
Clearance 0.020
Minor differences in crankshaft and crankcase dimensions
are compensated for by using selective bearings. For
further information on bearing part number to colour
cross-references, see the latest parts information.
• Measure the bearing to crankshaft main
journal clearance using Plastigage (Triumph
part number 3880150-T0301) (see page 5-
10).
Checking Crankpin Clearance using Plastigage
Crankshaft main bearing/journal clearance
Standard:
Service limit:
If the clearance exceeds the service limit, measure the
diameter of the crankshaft main journal.
Crankshaft main journal diameter
Standard:
Service limit:
Note:
• If any journal has worn beyond the service
li mit, the crankshaft must be replaced. Due
to the techniques used during manufacture,
the crankshaft cannot be reground and no
oversize bearings are available.
5.12
Service Manual - Daytona 675, Street Triple and Street Triple R
Main Bearing Selection Chart
(all dimensions in millimetres)
Red Red
35.981 35.989
35.973 35.981
33.000
32.992
32.984 32.993
0.044 0.043
0.020 0.021
0.020 - 0.044 mm
0.07 mm
32.984 - 33.000 mm
32.960 mm
Blue Blue
35.988
35.997
35.981 35.989
32.992 33.000
32.984 32.993
0.043 0.043
0.020
0.020
Select bearings as follows:
1. Measure and record the diameter of each crankshaft
main bearing journal.
2.
Measure and record each main bearing bore
diameter in the crankcase (bearings removed).
Compare the data found with the chart above to select
bearings individually by journal.
For example
Crankshaft Journal diameter
Crankcase Bore
Bearing Required
Note:
•
It is normal for the bearings selected to
differ from one journal to another.
•
It is also normal for there to be two options
of bearing shell colour. In such cases, pick
the shell size which gives the greater
running clearance.
Caution
Always confirm, using the Plastigage method, that the
running clearance is correct before final assembly.
Severe engine damage could result from incorrect
clearance.
Crankshaft End Float
Standard
Note:
• Crankshaft end float is controlled by the
tolerances in crankshaft and crankcase
machining. No thrust washers are used. If
the crankshaft end float is outside the
specified limit, the crankshaft and/or the
crankcases must be replaced.
Green
35.997
35.989
32.992
32.984
0.044
0.020
32.995 mm
35.997 mm
Blue
0.15 - 0.30 mm
lliMP