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Engine Rebuild - Crankshaft


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#1 Alphaboat


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Posted 03 November 2020 - 09:10 AM

I’ve just stripped down my engine as I’m planning on rebuilding it to suit a supercharger. This is the first time I’ve done an engine build so when I removed the crankshaft I got concerned over this part that looks worn (photo included) and would like to know if this is normal?

My mini is a 1994 Mayfair so has a standard 1275 engine.

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Edited by Alphaboat, 03 November 2020 - 09:14 AM.

#2 nicklouse


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Posted 03 November 2020 - 09:14 AM

The balancing cut outs are standard from the factory.  As is the cut out to clear the dizzy drive.

#3 Spider


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Posted 03 November 2020 - 10:50 AM

You'll find that the semi-circular cutting on the webs are to clear the Distributor drive and the more square cut outs were for clamping the crank in the factor to drill the Oil ways - if this is what you are referring to.


The Big End Journal does appear to have some wear in it, it's likely the Crank will need a Grind.

#4 ACDodd


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Posted 03 November 2020 - 01:58 PM

The journals need measuring to determine if they are serviceable. A micrometer is needed here as is a suitably experienced persons to use it.


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