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How to… fit new big end and main bearings - 4

4. Plastic fantastic

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

How to… fit new big end and main bearings - 4

Working class engine builders use something else though: Plastigauge. This is pieces of very carefully made thick plasticine-type material, which you place in between the bearing face and the journal, then tighten up the bearing halves. Take it apart again, and the Plastigauge has been squashed flat – to the thickness of the clearance inside the bearing. Now, because it's been very accurately made, measuring the width of the squashed section tells you what the bearing clearance is. It sounds properly Heath-Robinson, but it works…

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