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10th February 2020, 22:15 | #31 |
I really should get out more.......
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Have you ever tried nipping up both of the alloy manifold to cylinder head set pins? The card gasket joint does lose clamping force over time. There is a coolant gallery at each end that could leak into the cylinder and not show up in the vee. Failing that remove the manifold and fit new gaskets, remember to tighten the set pins again as with heat the manifold joint will loosen.
Last edited by Lovel; 10th February 2020 at 22:34.. |
11th February 2020, 19:20 | #32 |
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You must be mad!
Taking the heads off without any evidence of blown gaskets? Or have I missed someting?
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12th February 2020, 17:28 | #33 |
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I'm not mad but this is my last resort. I believe I have exhausted all the alternatives. It is just not possible for me to run a car that looses coolant so taking the heads off to inspect the gaskets has to be done even if it only eliminates it as a cause. I realise it is a huge job but the alternative is to scrap the car which I am reluctant to do. More constructive comments would be more helpful.
Martin |
12th February 2020, 17:41 | #34 | |
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Quote:
My good man, this is the most constructive I can come up with at the moment. You have NO indication that head gaskets play any role. You have two of them, and you want to remove them without ANY evidence that anything is wrong??. You have even tested for hydrocarbon in the coolant. And the results were negative! Have you pressure tested the cooling system.? Have you checked the two metal pipes in front under the radiator in the corners.? There are most likely the first dozen tests a normal person would perform before the heads are removed. But, this is your car, your money and your time. Feel absolutely free to use that anyhow you see fit.
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12th February 2020, 18:29 | #35 | |
I really should get out more.......
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Quote:
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23rd April 2020, 09:13 | #36 |
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Gary I must have missed your posts. I think you are referring to the inlet manifolds. I have replaced both gaskets TWICE so I think it most unlikely that it is leaking from there.
I have noticed that the engine oil is rather black and coupled with the mayonnaise under the oil filler cap I consider this to be sufficient evidence of a slight head gasket failure, although it does not appear to be getting worse. It is still leaking 700ccs of coolant to about 130 miles, so now that we are in lockdown it may be a convenient time to do the job and now that we have some better weather. I read somewhere that you do not have to remove all 3 bolts of air con compressor although it may be revealed once I start work, which two should be removed please? I trust everyone is keeping safe in these rather bizarre times. Martin |
23rd April 2020, 09:41 | #37 | |
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It could be a case of little use, and not getting up to temperature. That is the most optimistic version. Then it could be water from any little leak into the oil side, and here inlet manifolds on the V6 is right up there. So is a leaking oil cooler! I have not read through this whole thread, so it might have been said already. Head gasket is the most pessimistic option, and should only be considered, if backed by other indicators, like hydrocarbons in coolant, over pressure or visual indicators of water in a cylinder(s). In other words, that is the last option to go for, and one only done is confirmed by other tests.
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23rd April 2020, 10:13 | #38 | |||
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This most likely explains the mayonnaise under the oil filler cap. If a head gasket failure caused mixing of oil and coolant you would see it in the sump as well but not with your engine. Quote:
Martin, renewing KV6 head gaskets is an enormous and expensive job involving, for example, timing belt renewal. Since these gaskets are multi-layer steel your engine would have to have suffered serious overheating to result in damage. Please consider this very carefully before proceeding with a strip-down. If you still decide to do it, here's the answer to your question: Quote:
Simon
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23rd April 2020, 11:10 | #39 |
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I am sorry to hear that you still have this problem, but appreciate you coming back to update, one of my chief failings.
Have you drained and inspected the oil? If it is okay it can be put back. |
23rd April 2020, 15:28 | #40 |
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