V12 cylinder heads
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I believe you may be right about the ring, but I'm afraid the engine isn't coming out! I've confirmed that the leak goes into the sump. That takes care of that, the head (and tensioner) can stay put! ![Big Grin](https://www.jaguarforums.com/forum/images/smilies/biggrin.gif)
Thank you to everyone that responded and offered advice, it is much appreciated.
Cheers!![Icon Beerchug](https://www.jaguarforums.com/forum/images/smilies/icon_beerchug.gif)
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Thank you to everyone that responded and offered advice, it is much appreciated.
Cheers!
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Greg
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NathanDD6 (03-01-2016)
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Some work, yes, but not a huge expense. And while the engine is out you can do a good cleanup, fix any cam cover leaks etc etc, renew the oil pickup pipes O rings, all the belts and water hoses, replace any iffy wires. All good fun not expensive and dead easy with the engine out!
Greg
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NathanDD6 (03-02-2016)
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Taking heads off without taking tension off isn't the problem. Its putting the cam sprockets back in place AND in the correct cam timing position is the problem. Along with the getting the heads off to start with. Don't underestimate doing a valve job on a Jag V12. Its no wonder that so many of these V12 powered cars wind up being parts cars.
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Taking heads off without taking tension off isn't the problem. Its putting the cam sprockets back in place AND in the correct cam timing position is the problem. Along with the getting the heads off to start with. Don't underestimate doing a valve job on a Jag V12. Its no wonder that so many of these V12 powered cars wind up being parts cars.
#33
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Try pouring Seafoam or Marvel Mystery Oil in to the cylinder with no compression let it sit for a few days then take the spark plug back out crank the engine to get all the oil or seafoam out so you don't bend a rod, (It will shoot oil pretty far so be ready with rags or something) then start it and see if it burns off whatever carbon was in the cylinder making the ring stick. I know it worked on an old MGB I had an a TR7.
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NathanDD6 (03-11-2016)
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[QUOTE=NathanDD6;1420000]Ronbos, the ring is still stuck, so I'm gonna go the carby cleaner route, but it is certainly better, but not right, yet.QUOTE]
Continue the treatment with something or other (I am a great believer in a 50/50 mix of ATF and acetone by the way). Just keep at it and let it soak for quite a while. Then, having changed the oil, I reckon if you start the engine, warm it up and rev it a bit, drive it a bit if you can, even just round the yard, so it sees some load, and it will free itself.
Greg
Continue the treatment with something or other (I am a great believer in a 50/50 mix of ATF and acetone by the way). Just keep at it and let it soak for quite a while. Then, having changed the oil, I reckon if you start the engine, warm it up and rev it a bit, drive it a bit if you can, even just round the yard, so it sees some load, and it will free itself.
Greg
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NathanDD6 (03-13-2016)
#37
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All those voodoo mixes sound good, I'm a great believer in 50-50 diesel fuel and mystery oil, and soak for few days!
Although the acetone should really do well, it's a powerful solvent!
So far nobody has mentioned why the ring stuck in the 1st place, some times water or condensation has settled in the groove!(gasket,rain,etc)
Like Greg mentioned load it up ,get it HOT, luck may expand the aluminum piston and free the rings up!!
Although the acetone should really do well, it's a powerful solvent!
So far nobody has mentioned why the ring stuck in the 1st place, some times water or condensation has settled in the groove!(gasket,rain,etc)
Like Greg mentioned load it up ,get it HOT, luck may expand the aluminum piston and free the rings up!!
Last edited by ronbros; 03-12-2016 at 08:38 AM.
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NathanDD6 (03-13-2016)
#38
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Thanks for the replies, like i say I've driven her 1000km's before I figured it was more than a bad injector. Stuck ring I'm sure, got it soaking in carb cleaner as I type this. The car did sit for a long time (a year without running before I got her) and we also have the nasty problem of ethanol in our fuels, which I'm going with for the cause.
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