79cota348 Posted December 14, 2015 Report Share Posted December 14, 2015 Hi, I'm in mid restoration of my 79 Cota 348. Can anyone explain the 2 machined groves in the top mating face of the cylinder? Do I need a gasket, O-rings or something similar on assembly? I would appreciate any info. Photo attached. Quote Link to comment Share on other sites More sharing options...
feetupfun Posted December 14, 2015 Report Share Posted December 14, 2015 The grooves are to improve the sealing of the head-cylinder joint. No O rings or gasket or sealant are needed. You could fit a copper or aluminium gasket if you want to reduce the compression ratio, but it is not needed for sealing. Having the grooves reduces the force required to create a seal. 1 Quote Link to comment Share on other sites More sharing options...
79cota348 Posted December 15, 2015 Author Report Share Posted December 15, 2015 Hi 'feetupfun' appreciate the info. Hope to have the Mont back in action by spring time. 1 Quote Link to comment Share on other sites More sharing options...
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