Crankshaft Main Bearing/Journal Wear; Checking Crankpin Clearance Using Plastigauge - Triumph T595 DAYTONA Service Manual

6 CRANKSHAFT/RODS/PISTONS

CRANKSHAFT MAIN BEARING/JOURNAL WEAR

White
Shell Colour
41.126
Crankcase Bore
41.118
37.976
Journal Dia'
37.969
Running
Clearance
Minor differences in crankshaft dimensions are
compensated for by using selective bearings. For further
information on bearing part number to colour
cross-references, see the latest parts microfiche.
1. Measure the bearing to crankshaft main journal
clearance using plastigauge (Triumph part
number 3880150-T0301). Use the method
described in connecting rod clearance
measurement.

Checking crankpin clearance using plastigauge

Crankshaft main bearing/journal clearance
Standard:
Service limit:
If the clearance exceeds the service limit,
2.
measure the diameter of the crankshaft main
journal.
Crankshaft main journal diameter
Standard:
Service limit:
NOTE:
• If any journal has worn beyond the service limit,
the crankshaft must be replaced. Due to the
techniques used during manufacture, the
Main Bearing Selection Chart (all dimensions in mm's)
Red
41.126
41.118
37.968
37.960
0.044 - 0.020
0.020 - 0.044 mm
0.08 mm max.
37.960 - 37.976 mm
37.936 mm
Red Blue
41.135 41.135
41.127 41.127
37.976 37.968
37.969 37.960
All types
crankshaft cannot be reground and no oversize
bearings are available.
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 37.972 mm
Crankcase Bore
Bearing Required
NOTE:
• It is normal for the bearings selected to differ
from one journal to another.
CAUTION: Always confirm, using the
• plastigauge method, that the running
clearance is correct before final assembly. Severe
engine damage could result from incorrect
clearance.
Crankshaft End Float
Standard
Service Limit
NOTE:
• Crankshaft end float is controlled by the
tolerances in crankshaft and crankcase
machining. No thrust washers are used. If
crankshaft end float is outside the specified
li mit, the crankshaft and/or the crankcases
must be replaced.
6.18
TiUJMPU
Green
Blue
41.144
41.144
41.136
41.136
37.976 37.968
37.969 37.960
41.130 mm
RED
0.05 - 0.20 mm
0.4 mm max