18-08-2021, 08:34 PM
Hi everybody, I’m having the engine out of my RP box saloon reconditioned. We have removed the crankshaft and I have purchased the standard 2 bearings for the front and the single bearing for the back of the crankshaft. We have removed the old single bearing from the back of the crankshaft. When we tried to fit the new rear bearing on the crankshaft it was loose and could be ‘waggled’ on the end of the crankshaft. The crankshaft is supposed to be 1.25 inches diameter, so I measured the diameter of the new bearing, and found that it was the correct size to fit a 1.25 crankshaft. It appears that some time in the past the crankshaft must have been ground to a smaller diameter and an undersized bearing had been fitted to it, even though the outside diameter of the bearing ring was exactly the correct size. Has anybody come across this situation before? Are undersized crankshaft end bearings available from anywhere, or does anyone have a solution to this? Or am I going to have to buy another crankshaft? Hoping someone can help, many thanks.