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Connecting Rod Big End 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. Ensure service tool T3880504 is fitted to protect the oil spray jets.
4. Remove the bearing cap from the journal to be checked.
5. Wipe the exposed areas of the crankshaft journals, and the bearing face inside the
cap.
6. Apply a thin smear of grease to the journals and a small quantity of silicone release
agent to the bearings.
7. 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.
8. Lubricate the threads of the fixing and the face of the fixing with molybdenum
disulphide grease. Refit the bearing cap (see Crankshaft - Installation).
9. Release the fixings and remove the cap being measured.
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