Why not view our other blog at CKD Boats cc

Looking for info on boats? all sorts of stuff has been posted now on the first blog. Why not try Roys other blog, he has over 3300 entries in there. That blog is full of information and pictures,its really about one mans life. Designed for those who enjoy boats, cars, traveling , plus in some cases, finding out how to fix things yourself. We also started a third blog which is mainly about the two shops, my daughters started. plus odd ends about me and some I have known.



http://decorinspirations.blogspot.com/















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Try this link. http://ckdboats.blogspot.com/







Sunday, 9 December 2012

How to remove seized piston rings from Hillman Imp pistons

This will apply to most other makes of engines also?

We have a really early Mk1 Imp motor here, the engine number
 is  B / 41 / 1 /501572 WSO (export) which means its engine number 1572 made?



The bores had been fitted with some 0.030" pistons, they were removed when I was gifted the block and parts but all rings were well seized and to remove them risked breakage.

An oil and petrol mix was tried for a week, they were left soaking  and checked daily, nothing very much changed.



I then moved to using Oxalic Acid, its quite mild when mixed to a ratio of a half cup of powder to a litre of water. Daily the rings were tested but lightly, one broken ring will ruin the set.



It took six days before things loosened up enough to attempt to remove the rings that were by now becoming loose. Two second rings are still stuck, I will leave them a while longer, then see what we have and if we can take them out.

Roy

January 1st 2013

The engine was started today and I am pleased to say is a perfect runner, the Solex auto choke carb was a problem, it used too much choke, so we replaced it with a later manual choke Solex carb.

Its starts first time and ticks over around 600rpm and there is no smoke from the exhaust silencer!

Note, some may find sourcing Oxalic powder hard to do, we can post you some easy enough if thats the case?


Note, the rings when fitted back to their pistons and inn the 1963 Mk1 engine worked fine. That engine has now run on about 9 liters of petrol and the engine was run as a demo on May 3rd 2013 to highlight the Imps 50 years since production!

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