Crankshaft main bearing/journal wear (Triumph Rocket III)

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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.

Compare the data found with the chart above to select bearings individually by journal

Shell Colour	White	Red	Red	Blue	Blue	Green
Crankcase bore diameter	46.105 to 46.097	46.105 to 46.097	46.114 to 46.106	46.114 to 46.106	46.123 to 46.115	46.123 to 46.115
Crankshaft journal diameter	43.108 to 43.100	43.099 to 43.092	43.108 to 43.100	43.099 to 43.092	43.108 to 43.100	43.099 to 43.092

For example:

• Crankcase Bore — 46.099 mm
• Crankshaft Journal diameter — 43.095 mm
• Bearing Required — BLUE

Note: It is normal for the bearings selected to differ from one journal to another.

(The article is taken from the website: motoinstruction.ru)

It is also normal for there to be two options of bearing shell colour. In such cases, pick the shell size that gives the greater running clearance.

Warning! 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 end float

Crankshaft end float
Standard	0.05-0.20 mm
Service limit	0.40 mm

Note: Crankshaft end float is controlled by the tolerances in crankshaft and crankcase machining. Thrust washers are not used. If crankshaft end float is outside the specified limit, the crankshaft and/or the crankcases must be replaced.

See this article in russian language

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Article about repair motorcycles «Triumph Rocket III» (2004-2018): «Crankshaft main bearing/journal wear»: https://motoinstruction.ru/en/Triumph/Rocket/III/engine/repair/111831 <a href="https://motoinstruction.ru/en/Triumph/Rocket/III/engine/repair/111831">Crankshaft main bearing/journal wear</a> - article about repair motorcycles «Triumph Rocket III» (2004-2018) from section «Engine repair». [url=https://motoinstruction.ru/en/Triumph/Rocket/III/engine/repair/111831]Crankshaft main bearing/journal wear[/url] - article about repair motorcycles «Triumph Rocket III» (2004-2018) from section «Engine repair».