Triumph Speed Triple Service Manual page 89

Crankshaft, Connecting Rods and Pistons
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.
Measure the bearing to crankshaft main journal
a
1
clearance using Plastigage (Triumph part
number 38801 50-T0301) (see page 5-8).
Crankshaft main bearingljournal wear
(
Main Bearing Selection Chart
(all dimensions in mm's)
I
I
Checking crankpin clearance using Plastigage
Crankshaft main bearingljournal clearance
Shell
Colour
Crankcase
Bore
Journal Dia.
Running
Clearance
Red
4 1 . I 2 1
4 1 . 1 13
37.968
37.960
0.044
0.020
White
4 1 .I21
41.113
- - -
37.976
37.969
0.043
0.020
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Service limit:
I
0.07 mm
I
Standard:
If the clearance exceeds the service limit, measure
the diameter of the crankshaft main journal.
Red
4 1 .I30
4 1 .I22
37.976
37.969
0.044
0.021
0.01 9
-
0.044
mm
Crankshaft main journal diameter
Blue
4 1 .I30
4 1 .I22
37.968
37.960
0.043
0.01 9
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
reground and no oversize bearings are
available.
Standard:
Service limit:
Select bearings as follows:
Blue
4 1
.I
39
4 1 . I 3 1
37.976
37.969
0.043
0.020
37.960 - 37.976
mm
37.936 mm
1 .
Measure and record the diameter of each
crankshaft main bearing journal.
2. Measure and record each main bearing bore
diameter in thecrankcase (bearings removed).
Green
4 1 .I39
4 1 .I31
37.968
37.960
0.044
0.020
Note:
Compare the data found with the chart above to select
bearings individually by journal.
For example:
Crankshaft Journal diameter
37.972
mrn
Crankcase Bore
41.135
mm
Bearing Required Blue
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.
the running clearance is correct before final
assembly. Severe engine damage could result from
I
incorrect clearance.
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Service Manual
-
Speed Triple