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25th July 2018, 22:23 | #131 |
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25th July 2018, 22:33 | #132 |
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Redmaestro posted up looking for advice regards a coolant leak from his thermostat housing on a V6, he has been given expert advice from the Traders who have vast experience on repairing these cars on a regular basis, not just one car but hundreds, this includes a man who is an expert in thermoplastics.
I would be inclined to take heed of this advice. Earlier in the year i read an article in Car Mechanics, one of the contributors Andrew Everett bought an 2004 E46 3 series from the auction and it had a coolant leak, he said the plastic coolant pipes fell to pieces when carefully removing them, he remarked it was due to the heat/cooling cycles they have gone through over the cars life and remarked how even a slight weepage from these plastic coolant pipes almost certainly results in new replacements having to be sourced, over the years plastic does degrade and a fracture of a plastic coolant pipe can be catastrophic to any engine. The OP has been offered two conflicting views regards his coolant leak, hopefully after reading all the posts he will make the right decision.
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26th July 2018, 08:01 | #133 |
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Graham1961,
As a moderator, could you tell us whether or not a member is permitted to post a quote containing words which the author did not write and which reverses the meaning of that quote? Simon
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26th July 2018, 08:04 | #134 | |
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Or otherwise get back to the debate, it was a joke, but you seem to have taken it far to personally, I must have hit a raw nerve perhaps? Brian |
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26th July 2018, 08:56 | #135 | |
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I would tell redmaestro just to replace the four O rings as per SD1's advice. That's all it can possibly be! However he'll have a less than 10% chance of getting all 3 plastics out without them breaking leaving the stubs in the engine block. That's the gospel truth because Simon said 🤣👍🍺
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26th July 2018, 09:17 | #136 | ||
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Quote:
Quote:
Simon
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26th July 2018, 09:17 | #137 | |
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However it is the OPs decision what he does, one is a gamble, the other a peace of mind.
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26th July 2018, 09:45 | #138 | |
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Even if I did manage to extract an elbow in one piece I still wouldn't reuse it incase there's an undetectable hairline crack. A few hundred KV6's have passed through our workshops and we are not going to change our routine Simon. We don't get repeat comebacks for the same fault. That's all that matters to me 😉😎🍺
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26th July 2018, 19:14 | #139 |
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Here we have a picture of Simon's displaying his o ring problem........
Now Simon claims this to be caused by movement in the thermostat housing, well I only wished I had seen this picture before replying to his absolutely incorrect diagnosis. What has caused this failure is simple, this o ring has acquired compression set, no ifs buts or arguments. This is caused by the o ring material being in contact with a chemical substance which has altered its structure. Now I suspect this has been fitted incorrectly, probably lubricated with something containing a substance incompatible with the elastomer, as the only time I've seen an O ring this badly degraded before, it had been fitted to a four cylinder k series upper coolant rail with LM grease It is not caused by abrasion, as the o ring would not have failed with only the outer radius of the o ring displaying wear, but in this picture it is clear to see that the elastomer has swollen to fill the entire space available and suffered compression set. Chemical changes occur to an o ring which result in set, and the cross link density of the elastomer increases. This results in the o ring losing its elasticity and it's ability to return back to the original shape, and this is a permanent chemical change. This reduction in cross section results in a lower contact sealing force, which increases the risk of leakage in systems where thermal and pressure cycling occurs. So there you have it Simon, your o rings have been in contact with a substance that they are not compatible with, it's not as you thought anything whatsoever to do with movement. Brian P.S. the reason the grooves in the straight section of pipe are wider then the Herbie clips, is to allow the clips to be removed without damage, which of course is absolutely contrary to your findings, they are completely reusable |
26th July 2018, 19:25 | #140 | |
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So why not stop pretending to be cleverer than everyone else, because you are not, and to pursue this line of thought will make you look very silly indeed Brian |
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