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Thread: M50 Cylinder Head Non Return Valve

  1. #1
    Join Date
    May 2004
    Location
    San Joaquin Valley CA
    Posts
    264

    Default M50 Cylinder Head Non Return Valve

    It's the check valve in the cylinder head, I had in my mind that there were threads expounding the need to replace it. Tried a number of searches to no avail. Is there a way to test it or is it just a "if you have the head off, replace it" deal?
    Number 2 "non return valve" in this diagram, part number 11121735180

    I want to mate the head to my block but was wondering about this thing. Simple check valve device should be easily tested. Does it nee to hold 3 bar or???
    Link to my M50 engine rebuild thread
    http://www.bimmernut.com/forum/showthread.php/43339-M50-Eng-4L30E-Trans-RRR-Far-More-Than-I-Ever-Expected?highlight=93+525+paul


  2. #2
    Join Date
    Feb 2006
    Location
    Oldham, England
    Posts
    3,078

    Default

    Dont think it needs to hold 3 bar - I think the idea is it just stops oil from draining back down? IIRC they unscrew if you want to replace them. I just made sure mine wasnt stuck
    Oct '00 E46 330i. Feb '92 525i (departed)

  3. #3
    Join Date
    May 2004
    Location
    San Joaquin Valley CA
    Posts
    264

    Default Non Return

    Quote Originally Posted by whiskychaser View Post
    Dont think it needs to hold 3 bar - I think the idea is it just stops oil from draining back down? IIRC they unscrew if you want to replace them. I just made sure mine wasnt stuck
    Mine seems fine, clean as a whistle and works, can see the ball and spring check valve. Holds a bit, it's a very light spring.
    Thanks! No excuses, mount that sucker up...
    Link to my M50 engine rebuild thread
    http://www.bimmernut.com/forum/showthread.php/43339-M50-Eng-4L30E-Trans-RRR-Far-More-Than-I-Ever-Expected?highlight=93+525+paul


  4. #4
    Join Date
    May 2004
    Location
    San Joaquin Valley CA
    Posts
    264

    Default

    Here's what it looks like, came out easily back when I was cleaning the head up, lapping valves etc.


    Here it's being reinstalled in the head
    Link to my M50 engine rebuild thread
    http://www.bimmernut.com/forum/showthread.php/43339-M50-Eng-4L30E-Trans-RRR-Far-More-Than-I-Ever-Expected?highlight=93+525+paul


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