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Thread: Oil starvation damage to camshaft

  1. #26
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    Quote Originally Posted by Critter7r View Post
    In the absence of conclusive evidence of negligence on the part of the oil change shop (there is no conclusive evidence), the dealer should pursue the timing chain extended warranty route.
    +1

    It may be necessary to bring in a specialist to examine it.
    Last edited by ship4u; 02-06-2019 at 01:13 PM.

  2. #27
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    This 328i N26 owner describes his experience with timing chain failure. Note, however, the damage was to the lower engine, not the top.
    https://f30.bimmerpost.com/forums/sh....php?t=1236843

    - - - Updated - - -

    This is the lawsuit that apparently prompted BMW to provide the extended warranty.
    https://www.carcomplaints.com/news/2...g-chains.shtml

  3. #28
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    Quote Originally Posted by ship4u View Post
    This 328i N26 owner describes his experience with timing chain failure. Note, however, the damage was to the lower engine, not the top.
    https://f30.bimmerpost.com/forums/sh....php?t=1236843

    - - - Updated - - -

    This is the lawsuit that apparently prompted BMW to provide the extended warranty.
    https://www.carcomplaints.com/news/2...g-chains.shtml
    That first one sounds like the oil pump chain let go, and caused the lower end to seize.
    Quote Originally Posted by B4SH View Post
    If anyone knows, it's this guy who knows literally nothing about everything.
    Quote Originally Posted by fcvapor05 View Post
    Do you even OT? The mean 401k around here is probably about $6, what with all the shiny cars and $1,000 watches and donations to get other members' Volvos running.


  4. #29
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    jthang, any update on your situation?

  5. #30
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    Thanks for checking in. According to the repair shop, the amount of play in the timing chain was within normal limits, and there was no apparent damage to the guide block. They said that depending on the position of the cam, it would be possible to advance the chain with just a fingertip. They don't think there is anything wrong with the timing chain or that the issues giving rise to the extended warranty are at play here.

    Last week, I met with the oil change shop's insurance inspector, and he confirmed that he did not believe there was an issue with the timing chain. Instead, his concerns were that:
    1. The third intake cam bearing showed discoloration and deep scarring, but the first, second, and fourth bearings were shiny and relatively smooth, though worn down. The fourth had a few rough patches, but seemed in better shape than the third. That made him think that the third bearing had some kind of mechanical defect that was the source of all the problems to the engine. He said that if there had been insufficient oil, then the fourth would have been worse than the third, since it is further from where the oil enters the cam.
    2. He did not observe heat discoloration on the camshaft journals. (I don't think this is true. The journals are clearly darkened.)

    I told him that I would get back to him with a full explanation of why the above points cannot be relied upon, especially in light of all the other evidence of oil starvation. I think I have enough from the the helpful comments that have been left on this thread, but if anyone else has any other ideas or thoughts on why the third cam bearing and journal would be in worse shape than the fourth, I would appreciate it. As for discoloration, I think this is just a matter of showing him pictures of the journals. The bearings are smooth and shiny (other than the third, which is black and pitted), but I think that is because the bearings are made from a different metal alloy than the journals, right?

  6. #31
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    jthang, I'm very glad to hear that there is some progress towards a resolution with the oil change shop insurance. I believe that the inspector's assessment is weak and will be easily disproved with some help from your repair shop. They are your best asset because they diagnosed the problem originally as oil starvation and they have the first hand examination of the evidence.
    The "discoloration" of the metal parts is due to high heat, which is consistent with friction caused by oil starvation. The camshaft and valves are moving very rapidly and will create heat immediately along with destruction in the form of metal shavings. Minute metal shavings combined with rapid movement and lack of oil equals catastrophic failure. The damage to your engine happened very quickly and the lack of more uniform damage to each of the journals, in my opinion, supports oil starvation, not a pre-existing longer present defect in a bearing or camshaft. No one can say where the minute metal shavings will end up and which parts will be affected.
    Best to you and keep us posted.

  7. #32
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    any update?

  8. #33
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    No, still waiting on a response from the insurance inspector. I'll let you know what happens.

  9. #34
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    Quote Originally Posted by jthang View Post
    No, still waiting on a response from the insurance inspector. I'll let you know what happens.
    Thanks. I wish the best for you in this terrible situation and I check each day for some good news.

  10. #35
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    jthang, I was in contact with a technician who informed me that your BMW will have a date AND TIME record of exactly when the engine issue occurred. The dealer should be able to obtain that information from the fault code. The time information would be helpful for you since that would indicate that something happened while they actually had your car in their shop. Best to you!

  11. #36
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    Sorry if I interrupt here, but I wonder how the oil change place ascertained that there was no oil, or not enough oil in the engine, when the electronic sensor wants the oil to be at operating temperature before showing the level. Running the engine for that length of time would've caused all kinds of damage. Unless this engine has an actual dipstick, which I don't know.

  12. #37
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    Quote Originally Posted by Donlundm3 View Post
    Sorry if I interrupt here, but I wonder how the oil change place ascertained that there was no oil, or not enough oil in the engine, when the electronic sensor wants the oil to be at operating temperature before showing the level. Running the engine for that length of time would've caused all kinds of damage. Unless this engine has an actual dipstick, which I don't know.
    Good points, Donlundm3. It is very curious what went on in that oil change bay. Jthang can confirm, but I don't believe his car has an oil dipstick, but rather, must rely on the electronic sensor to determine oil level. It seems that the engine was started without oil, at which the operator probably heard engine noise and turned the engine off. What I can't figure out is why they then only filled the engine 1/2 way and gave him back the car. That is negligence in itself.
    Last edited by ship4u; 03-21-2019 at 01:21 PM.

  13. #38
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    Any news?

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