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Thread: Cylinder head leaking

  1. #1
    helipilot04
    Guest

    Cool Cylinder head leaking

    I have a 72 75/5, and I'm in need of some advice.. I want to take the head off and see where the leak is coming from. I dont have the BMW special tools tho. Has anyone tried to take the finned exhaust pipe nut off without the correct wrench?..

    Thanks
    Bob

  2. #2
    mymindsok
    Guest
    Quote Originally Posted by helipilot04 View Post
    I have a 72 75/5, and I'm in need of some advice.. I want to take the head off and see where the leak is coming from. I dont have the BMW special tools tho. Has anyone tried to take the finned exhaust pipe nut off without the correct wrench?..

    Thanks
    Bob
    Yes... Lots have tried it and every one of them has undoubtly damaged the exhaust nuts.

    If youre going to work on an Airhead, the exhaust nut wrench is an indespensable tool.

  3. #3
    On the Road
    Join Date
    Sep 2007
    Location
    Albuquerque, NM, USA
    Posts
    34
    I have had good luck in the past using a large strap wrench as long as the nut isn't too corroded or too tight. I now own the correct wrench (good investment as noted by Mymindsok).

    Nut replacement should include anti-sieze compound and just a snug fit (no need to crank down on it).

    Good luck!

    Marley

  4. #4
    helipilot04
    Guest
    Well I guess I will buy one, not a problem, just wanted to see if there was a good way..

    One more question for those of you who have reinstalled the head. Do I need a (the) rocker arm alignment tool as shown in this post. http://www.pbase.com/dqmohan/prtseals


    Thanks

  5. #5
    Registered User
    Join Date
    Jan 2006
    Location
    Wisconsin and Florida
    Posts
    399
    Probably best to see where leak is before removing the head.

    Clean head and cyl exterior

    apply talcum powder or similar fine powder product

    run briefly and leak source will be obvious

  6. #6
    helipilot04
    Guest
    I found the leak. Need some advice in how to solve this. The leak is where the pushrod tubes meet the head (outboard of the block) both sides. I think it is due to the fact a few fins were broken off and pushed into the tubes. Can I replace the tubes, or the seals? Or do I need to replace the whole head / jug?


    Bob

  7. #7
    Registered User
    Join Date
    Jan 2006
    Location
    Wisconsin and Florida
    Posts
    399
    Depends on what your needs require

    If just want to plug the leak to get by without removing the heads -
    clean best you can and force red silicone and thread wrap up into
    leaking area - there is little or no pressure on the oil in these tubes
    since they are only gravity drain from head back to crankcase.

    Brake cleaner followed by silicone smear will stop leaking pushrod
    rubbers at the bottom for quite some time - never tried it on the
    top of the tubes but probably would work. Keep the tube of silicone
    and your homemade driver tool in your bike toolkit.

    If you are mr. fussy and neat freak then must remove the heads -
    drive out the tubes - make the hole round - force tapered round
    drift into tube ends to enlarge slightly and then reinsert. Memory
    may not be perfect but did something like this on older model many
    years ago.

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