Rui Guimaraes Posted February 26, 2011 Share Posted February 26, 2011 Hello everyone!A few days ago I had a sudden loss of power on my mk1 GT6 like the engine was running in only in 5 or less cylinders.I've checked and rechecked the ignition system and everything looked to be OK but the problem persisted.Today I've changed plugs, distributor cap, points, condenser, rotor and ignition leads but it is still the sameLater today, i have removed the filter box and putted the engine running again and there is a ratleling noise coming from the front carburetter which I can not identifyDoes anyone have any idea of what could be happening?ThanksregardsRui Link to comment Share on other sites More sharing options...
Rui Guimaraes Posted February 26, 2011 Author Share Posted February 26, 2011 And I forgot to mention that with the ratleling noise comes a petrol spray spitting from the same front carb when accelerating...??? :-/Rui Link to comment Share on other sites More sharing options...
RedRooster Posted February 26, 2011 Share Posted February 26, 2011 Jet O'Ring perhaps? Link to comment Share on other sites More sharing options...
greenbonnie Posted February 26, 2011 Share Posted February 26, 2011 hi rui i had a similar problem on my spitfire. it turned out to be a badly worn dashpot piston. worth looking. pete. this caused the car to come to a grinding halt. this happened many times . managed to get car home. Link to comment Share on other sites More sharing options...
Rui Guimaraes Posted February 27, 2011 Author Share Posted February 27, 2011 I've checked both things on the front carb and both were perfect... :(Decided then to measure the compression of the cylinders and bad news...Cylinders no.1 and no.2 only get to 3 bar. All the others are OK with 9.5 bar.Anyone has any ideas? Bad head gasket??? What could do that to both cylinders at one time?ThanksRegardsRui Link to comment Share on other sites More sharing options...
rotoflex Posted February 27, 2011 Share Posted February 27, 2011 It certainly sounds like the head gasket.Have you removed the valve cover & then observed the valve train while idling? It would have to be something unlikely such as valves stuck open or broken on both #1 and #2, but you never know. The rattling sound is hopefully not broken valve springs (or valves). Link to comment Share on other sites More sharing options...
Rui Guimaraes Posted February 27, 2011 Author Share Posted February 27, 2011 No. I had a look with the valve cover off and they seem to be OK. It must be a the gasket... (i hope...)The rattling noise only comes if the engine is working. With the ignition cables off and running only with the starter it looks smooth and without noises...RG Link to comment Share on other sites More sharing options...
Deleted User Posted February 28, 2011 Share Posted February 28, 2011 head gasket blown between 1 and 2, also causes spitting back of carb Link to comment Share on other sites More sharing options...
Rui Guimaraes Posted March 1, 2011 Author Share Posted March 1, 2011 Hello again.Decided to go forward and to remove the head tonight.2 hours of work and then good news...Now it only needs a good decoke and light skim to the face.On question can anyone tell by the last photo if the engine has been rebuild?The pistons are marked as follows: + 020 X24Thanks to all Regards RuiPS - here are also some pictures of my distributor restoration. Link to comment Share on other sites More sharing options...
Dicky Blighter Posted March 1, 2011 Share Posted March 1, 2011 +20 means it's certainly been re-bored - thats a well blown head gasket!!!!Looks like core plugs have corroded through and manifold gasket blown as well, hard to tell from pictures but bores look to be well worn and looks like you are getting blow by on the rings from the amount of carbon and fouling on the head. Now you have the motor that far in bits be worth looking at bottom end as well. That looks to be a pretty knackered engine. Link to comment Share on other sites More sharing options...
rotoflex Posted March 1, 2011 Share Posted March 1, 2011 Agreed, it's time to go complete rebuild.Congratulations on getting the head off in one day, you're past the hardest part! Link to comment Share on other sites More sharing options...
andy thompson Posted March 1, 2011 Share Posted March 1, 2011 Reckon that 2 litre will go on for years - clean up the head - chuck some new core plugs in and keep driving :)Rebuild is fraught with sub standard parts , unnecessary expense and lack of ability to drive the car.All that soot and carbon indicates it needs a good thrashing and possibly leaning off a bit Link to comment Share on other sites More sharing options...
Rui Guimaraes Posted March 1, 2011 Author Share Posted March 1, 2011 Thanks for all your comments and your help.For now I'm only touching the head.The car is going to be fully rebuild later this year and I will recondition the engine at that time.Thanks.RegardsRui Link to comment Share on other sites More sharing options...
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