Connecting Rod Bore Diameter
Crankshaft Journal Diameter
Crankshaft Main Bearing/Journal Checking, Measuring and Bearing Selection
1. Measure the bearing to crankshaft journal clearance as follows:
Do not turn the connecting rods and crankshaft during the clearance measurement as
this will damage the Plastigauge. The crankshaft journal clearances are measured using
Plastigauge (Triumph part number 3880150-T0301).
2. Remove the lower crankcase (see Lower Crankcase - Removal).
3. Make sure service tool T3880504 is fitted to protect the oil spray jets.
4. Wipe the exposed areas of the crankshaft journals, and the bearing face inside the
cap.
5. Apply a thin smear of grease to the journals and a small quantity of silicone release
agent to the bearings.
6. Trim a length of the Plastigauge to fit across each journal. Fit the strip to the journal
using the grease to hold the Plastigauge in position.
The original fixings may be reused for bearing selection. Do not use new fixings as
they may only be used once, even if the single use is related to bearing selection.
7. Lubricate the threads and the face of the fixings with molybdenum disulphide grease.
Refit the crankcase and tighten the original fixings (see Lower Crankcase -
Installation).
8. Release the fixings and remove the crankcase.
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