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Thread: Engine swap or fix question

  1. #1
    Join Date
    Nov 2017
    Location
    Phoenix
    Posts
    17
    My Cars
    2001 330Ci 2012 X5 3.5

    Engine swap or fix question

    I have a 2001 330Ci 5 speed with about 165000 miles on it. The oil pan is leaking and last year cylinder 1 spit out the spark plug taking the coil pack with it. Not really sure why that happened. A buddy of mine reset the spark plug using a heli coil and its been running beautifully ever since. (Dear god I love this car) My concern is that it will eventually spit that plug out again tho.
    Should I do repairs on this engine or just swap in a new (used) one?

  2. #2
    Join Date
    Jul 2013
    Location
    Casablanca, Morocco
    Posts
    80
    My Cars
    2001 e46 323i
    I had the same issue with my old M52TUB25 (previous owner had put a 4cyl dipstick and it messed up the reading, the chain tensioner did not appreciate after some hard mountain drive, that's a long story...) and the helicoil did just fine. Although I'm not sure it was repaired the same way yours was (a turner created a new threading in the engine block after soldering an aluminium cylinder into the plug's housing).

    It actually survived an engine blow-up...so I wouldn't worry too much if I were you, or just wait until it actually spits it out.


    Quote Originally Posted by GriffX5 View Post
    I have a 2001 330Ci 5 speed with about 165000 miles on it. The oil pan is leaking and last year cylinder 1 spit out the spark plug taking the coil pack with it. Not really sure why that happened. A buddy of mine reset the spark plug using a heli coil and its been running beautifully ever since. (Dear god I love this car) My concern is that it will eventually spit that plug out again tho.
    Should I do repairs on this engine or just swap in a new (used) one?

  3. #3
    Join Date
    Jan 2007
    Location
    Atlanta, GA
    Posts
    5,171
    My Cars
    2017 Ram 2500d
    If the repair was done properly, it wouldn't even be a concern of mine.
    BMW Level 1 Master Technician
    2017 Ram 2500d
    2017 Jeep Grand Cherokee
    2014 Moomba Mobius LSV

  4. #4
    Join Date
    Nov 2017
    Location
    Phoenix
    Posts
    17
    My Cars
    2001 330Ci 2012 X5 3.5
    Really? That's good to hear. I have faith in the mechanic who did I just had heard inline threads are timebombs. If that's not the case then I'll just fix the oil leak and keep the motor i got.
    Thanks

  5. #5
    Join Date
    Jul 2013
    Location
    Casablanca, Morocco
    Posts
    80
    My Cars
    2001 e46 323i
    My former engine was not in the best condition and maybe compressions were a bit lower than they should have been, which could (?) explain why the thread held, but I doubt that.

    If you wanna be on the safe side you can take the spark plug out in a few hundred miles/months (always on a cold engine and never tighten it back too firmly) and check it out, but your engine should be fine. Mine held on for a good 3 years after the issue even with hard driving/redlining, you name it...

  6. #6
    Join Date
    Jun 2002
    Location
    boonies, western NC
    Posts
    19,671
    My Cars
    E39M5
    Griff, I agree fully with White94RX. Don't worry about it....fix what's actually broken.

    Chris Powell
    Racer and Instructor since, well. decades, ok?
    Master Auto Tech, at an independent, formerly @ dealer
    BMWCCA 274412 SCCA 334928

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