rbalding Posted December 18, 2015 Report Share Posted December 18, 2015 I'm in the process of replacing pistons and rings in a Triumph 1296cc engine. The cylinders have never been rebored and the new pistons and rings are standard size (supplied by Rimmer). The rings have been gapped correctly and the bores de-glazed. My question concerns the oil control ring. Both rails have been gapped and are OK, but the spacer seems a very tight fit in the bore - such that I can only just move the con rod (not attached to the crankshaft) up and down by hand, despite copious lubrication. I assume the spacer cannot be adjusted (and that I was supplied with the right rings!). Does this sound normal or is there something wrong somewhere I wonder? Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 18, 2015 Report Share Posted December 18, 2015 If this is a double/ pair of rings with a spreader yes they can be very tight (But its a long time ago ) so need more clues pete Link to comment Share on other sites More sharing options...
rbalding Posted December 20, 2015 Author Report Share Posted December 20, 2015 Thanks Pete. I decided to abandon these rings. They took an awful lot of filing to get the required gap, yet the oil control spacer had no corresponding form of adjustment, resulting in it standing too proud and virtually binding in the bore. Anyway, a happy ending - subject to testing on completion of the rebuild! I tracked down a set of period NOS Cords rings. They are a great fit in the piston grooves and needed no filing to achieve the right gap. Once in the cylinder, each piston seems to have the level of resistance I would have expected - neither too tight, nor too sloppy. Fingers crossed! Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 20, 2015 Report Share Posted December 20, 2015 That sounds a plan, Cords thats a name from the past cures for oil burners glad is sorted , I never have liked these multi ring sets , maybe you have been sold a pup pete Link to comment Share on other sites More sharing options...
rbalding Posted December 20, 2015 Author Report Share Posted December 20, 2015 Conceptually, there's not a huge amount of difference on the face of it. The top compression ring and the oil control ring are conventional in their design. However, the second compression ring differs only in that it consists of two thinner 'cupped' rings replacing the usual single ring. On balance, I'm happy to put my faith in old school British design and manufacture. I'll let you know how it runs! Regards, Bob Link to comment Share on other sites More sharing options...
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