68vitesse Posted December 18, 2021 Report Share Posted December 18, 2021 Blew the head gasket between five and six in my 2L Mk1 engine and noticed a knock on acceleration only afterwards and was wondering if hot gasses from the adjacent cylinder could cause pre-detonation,or have I damaged a big end. I don't have a two inch micrometer to check the crankpin diameter and don't want to go to the trouble of removing the crankshaft unless I have to. Currently have a spare engine fitted so no rush to refit. Regards Paul. Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 18, 2021 Report Share Posted December 18, 2021 i cant see a HG failure causing any journal problems its not related unless you emptied the coolant in the sump and drove for miles on a nasty mix of oil and antifreeze in an overheated uncooled engine but knocking from the cross flow between 5 &6 will do a variety of knocks ,bangs and whistles Link to comment Share on other sites More sharing options...
johny Posted December 18, 2021 Report Share Posted December 18, 2021 Not too difficult to check the big end shells in situ anyway if you are worried. You'll know from the shell if theres a problem and then have to measure the crank... Link to comment Share on other sites More sharing options...
68vitesse Posted December 18, 2021 Author Report Share Posted December 18, 2021 Thanks for the replies, didn't lose any coolant, engine temperature normal, and oil was not contaminated so hopefully just a head gasket problem. Regards Paul. Link to comment Share on other sites More sharing options...
NonMember Posted December 18, 2021 Report Share Posted December 18, 2021 My Mk1 Vitesse went through a few years of blowing head gaskets between cylinders. It makes a godawful racket of knocks, like Pete says. Partly it's down to the combustion on one of those cylinders happening while the other has an open valve. Link to comment Share on other sites More sharing options...
Pete Lewis Posted December 18, 2021 Report Share Posted December 18, 2021 so remove studs clean the faces die the threads on the studs fit HD nuts and Hard washers or if its a 3/8 stud use flange faced head nuts from minispares bet the old washers have deformed this looses torque the head pants and pop goes the gasket Pete Link to comment Share on other sites More sharing options...
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