Crankshaft
Connecting Rod Big End Bearing
Selection/Crankpin Wear Check
1.
Measure the bearing and crankpin clearance as
follows.
Note:
• The crankpin clearances are measured
using 'Plastigage' (Triumph part number
3880150·T0301).
Do
not turn the
connecting
rod
and crankshaft during
the
clearance measurement
as
this
will
damage the 'Plastigage'.
2.
Remove the big
end
cap from the journal to
be
checked.
3.
Wipe the exposed areas of the crankpin, and the
bearing
face
inside the
cap.
4.
Apply a thin smear of grease to the journal and a
small quantity of siiicone release agent to the
bearing.
5.
Trim
a length of the Plastigage
to
fit across the
journal. Fit the strip to the journal using the
grease to hold the Plastigage
in
place.
6.
Lubricate the threads
of
the
bolt and under-head
area with undiluted molybdenum disulphide
grease. Refit the bearing and cap and tighten the
big
end bolts as described earlier.
7.
Release the bolts and remove the cap being
measured. Using the gauge provided with the
Plastigage kit, measure the width
of
the
compressed Plastigage.
Checking the Measured Clearance
Con
rod
big
end
bearing/crankpin clearance
Standard 0.065 - 0.035
mm
Service Limit 0.100
mm
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
reground and oversize bearings
are not available.
5.12
Service Manual - Rocket III
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