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Hastings Piston rings


The General

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Hi guys, Simon and myself are trying to fit some new piston rings into his newly bored engine, but we are having problems with the rings.

 

The rings are made by Hastings, and were packed in 65, they have come with no fitting instructions and no markings indicating top and bottom orientation.

 

We are ok for the oil scraper ring-bottom, but cant work out the middle and top.

 

One set of rings has a grove around the inside of the ring, the other set has a step on the outer edge.

 

any ideas on which way round these should be ?

 

Thanks in advance, Tim & Simon.

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