White
40.958
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
Red
Crankpin 40.960 to 40.953
to
diameter 40.954 40.946
For
Instance:
Crankpin diameter
Required Bearing
Note:
• 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.
Checking crankshaft clearance using
Plastigage
Crankshaft main bearing/journal clearance
Standard 0.018 -
0.041
mm
Service limit 0.100
mm
2.
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
reground and oversize bearings are not
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
but
all crankcase bolts fully torqued (see page
5.8).
Note:
• The original crankcase
bolts
may be
reused
for
bearing selection. Do
not
use
new
bolts
as they may
only
be used once,
even if the single use is related
to
bearing
selection.
Service Manual - Rocket III
5.13
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