This bushing is important as it supports the timing-side crank journal and must be sized correctly to allow oil flow to the big-end journals. A worn crank bush will produce low oil pressure and can cause the rod bearings to seize on the journals.
This timing-side bushing is for Triumph part number 70-4322 and fits all Triumph 350 and 500 Unit Twins from 1957-1968. The bush is a steel-backed bronze plain bearing that is pressed into the timing-side crankcase. It is available in (3) undersizes to accommodate a machined crank journal.
The bush supports the timing-side main journal of the crankshaft and provides lubrication from the oil pump to the rod bearings. It is installed directly into the timing-side of the crankcase and is an interference fit.
Use the drop down menu to select what size bushing you need.
Please refer to your parts catalog for proper fitment.
