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Thread: The did my motor just eat a ring thread... ?

  1. 09-07-2009, 08:43 PM #1
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    The did my motor just eat a ring thread... ?

    So just the other day a buddy stole my car and went for a joyride. After returning a good friend of mine went to the store in it. Called me and said there is alot of oil burning smell and a new whirring noise. He brought it back and i took a look.

    What i can tell:
    My CCV which is venting to atmosphere is now dumping a ton of oil vapors where as only a small amount was coming out before.
    There is a whirring noise that is RPM dependent that seems to me like a rod/crank bearing but is coming from the middle of the motor (between 3/5) and is in the valvetrain.

    I have so far tested compression and its good across the board... Any more ideas? The engine seems to run fine but this is unsettling...
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  2. 09-07-2009, 10:25 PM #2
    284Shooter
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    Quote Originally Posted by 328iJunkie View Post
    ... Any more ideas? ...
    Stop letting people use your car!

    Can you attach an audio clip?
    Last edited by 284Shooter; 09-07-2009 at 10:27 PM.
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  3. 09-07-2009, 10:37 PM #3
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    compression is solid across, def not a ring... video clip?
    Last edited by Hova; 09-07-2009 at 11:04 PM.
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  4. 09-07-2009, 10:50 PM #4
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    will have one tomorrow... Gotta put the coils back in after the comp test
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  5. 09-07-2009, 10:56 PM #5
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    What makes you think the piston rings are gone? If the compression is good across the boards they must be fine. I agree a video clip would be helpful.
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  6. 09-07-2009, 11:41 PM #6
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    What else explains the excessive blowby?
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  7. 09-07-2009, 11:46 PM #7
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  8. 09-08-2009, 12:23 AM #8
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  9. 09-08-2009, 12:33 AM #9
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    Sometimes CCV things can go bad and piss oil. I've heard of it happening on other cars. I'd take the valve cover off and have a look under there.
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  10. 09-08-2009, 12:41 AM #10
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    Im venting to atmosphere. There is no CCV system, just a vent. And its spewing oil fumes...
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  11. 09-08-2009, 01:06 AM #11
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    That's weird.
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  12. 09-08-2009, 01:19 AM #12
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    Quote Originally Posted by 328iJunkie View Post
    Im venting to atmosphere. There is no CCV system, just a vent. And its spewing oil fumes...
    Is that the vent in front of valve cover gasket by VANOS?
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  13. 09-08-2009, 01:25 AM #13
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    Yes.
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  14. 09-08-2009, 01:34 AM #14
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    Maybe one of the camshaft bearings died.
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  15. 09-08-2009, 02:14 AM #15
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    Quote Originally Posted by mtechnica View Post
    Maybe one of the camshaft bearings died.
    possible...


    not probable.
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  16. 09-08-2009, 02:27 AM #16
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    Quote Originally Posted by Hova View Post
    possible...


    not probable.
    It would explain the whirring sound, the fact that it runs fine, and the oil fumes from it burning oil because of friction.
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  17. 09-08-2009, 02:36 AM #17
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    Quote Originally Posted by mtechnica View Post
    It would explain the whirring sound, the fact that it runs fine, and the oil fumes from it burning oil because of friction.

    sure would.

    just haven't seen something like this without some serious misuse, or improper matinence.
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  18. 09-08-2009, 05:37 AM #18
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    I realize that your comp tests read ok, but I think he has done you the favor of glazing the bores. He beat on the engine while it was cold.
    If it starts smoking out of the tail pipe in a few miles, I won't be surprised.

    Hopefully though, the emissions pump/egr system just happened to fail at this time.(I did not check the year of your car, but 96-99 relevant)

    The whirring sound is probably the Vanos being unhappy.

    m
    Last edited by mmark.; 09-08-2009 at 05:38 AM.
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  19. 09-08-2009, 05:48 AM #19
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    Quote Originally Posted by mmark. View Post
    I realize that your comp tests read ok, but I think he has done you the favor of glazing the bores. He beat on the engine while it was cold.
    If it starts smoking out of the tail pipe in a few miles, I won't be surprised.

    Hopefully though, the emissions pump/egr system just happened to fail at this time.(I did not check the year of your car, but 96-99 relevant)

    The whirring sound is probably the Vanos being unhappy.

    m
    prognosis? ie... how do you 'unglaze' cylinders?
    Last edited by Casebrius; 09-08-2009 at 12:51 PM.
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  20. 09-08-2009, 07:48 AM #20
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    Its not a vanos noise, i know that. And the camshaft journal bearings being Fed is also very possible but i wouldnt think it would spew this much oil fumes... My cams had some pretty bad scouring the last time i put them in (3rd HG ) A year and a half or so ago....
    And no SAP/Emissions system is in place.
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  21. 09-09-2009, 10:58 AM #21
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    Any more ideas !?
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