How to… fit new big end and main bearings - 3

3. Mind the gap

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Visordown's picture
Submitted by Visordown on Fri, 01/09/2017 - 14:30

To keep this oil cushion working well, we need a very accurate gap between the bearing shell and the crankshaft journal. It's a very small gap – in the order of hundredths of a millimetre. So how the feck do we measure that? Well, if you're a bike factory, or a megabucks engine builder then you have eye-bleedingly accurate bore gauges and micrometers, which you use to measure the inside diameter of the bearings, and the outside diameter of the journals…

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