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Thread: 48 Pan engine mounting problem

  1. #1

    Default 48 Pan engine mounting problem

    Hi Guys

    On reinstalling there is no clearance between the rear head and the frame, which I hadn't noticed when removing the engine. I believe this should be 3/16" to 1/4"? Is there a best practice for this? If not, I would be tempted to reduce the height of the forward mounts, and/or install shims at the rear?

    Thanks

    Greg

    IMG_3397.JPG IMG_3399.JPG IMG_3400.JPG IMG_3398.JPG

  2. #2
    Join Date
    Nov 2010
    Posts
    219

    Default

    Greg; It looks like you have the thick rocker arm cover gasket installed. I would use the thin ones which would solve your clearance problem.CIMG1727.JPGCIMG1728.JPGCIMG1730.JPG
    Craig

  3. #3

    Default

    Hi Craig

    Not that simple, I'm afraid, It's the head that is also against the frame, It appears I can cure this with 1/8" shim between the rear engine support and engine. Whilst ideally I'd fabricate a full length bracket, could I get away with a couple of 1/8" washers???

    Thanks

    Greg

  4. #4
    Join Date
    Jul 2010
    Location
    Ohio
    Posts
    699

    Default

    If the motor sits flat between the front and rear mounts you can't just add to one without making the other uneven. I think washers are not a good approach. If things are already painted and finished you are kinda locked in with where you are at. I have removed some of the head in this area to help with the problem. Using a dremel, radius the head to clear the down tube, if that is the problem.
    Bob Rice #6738

  5. #5
    Join Date
    Aug 2004
    Location
    Beautiful Northern New Mexico
    Posts
    2,921

    Default

    I hate stupid cell phone pictures not oriented correctly. Therefor I have zero opinion on a fix....
    Robbie Knight Amca #2736

  6. #6

    Default

    Thanks for all your comments - problem sorted

  7. #7
    Join Date
    Jul 2010
    Location
    Ohio
    Posts
    699

    Default

    Hopefully you will share your fix or what caused the problem.
    Bob Rice #6738

  8. #8
    Join Date
    Jan 2006
    Location
    Menomonie, WI
    Posts
    1,313

    Default

    Usually this type of problem is reserved for Knucklhead frames. If you mounts are all in good condition on both engine and frame it means your frame has settled at the seat post which is fairly common on frames with a rougher life. I just put them in my fixture and shove the top of the frame back until it holds and engine fits. Just did this to a Knucklehead frame last week.

    Jerry

    Quote Originally Posted by harleygreg View Post
    Hi Guys

    On reinstalling there is no clearance between the rear head and the frame, which I hadn't noticed when removing the engine. I believe this should be 3/16" to 1/4"? Is there a best practice for this? If not, I would be tempted to reduce the height of the forward mounts, and/or install shims at the rear?

    Thanks

    Greg

    IMG_3397.JPG IMG_3399.JPG IMG_3400.JPG IMG_3398.JPG

  9. #9
    Join Date
    May 2009
    Posts
    153

    Default

    Jerry, Do you have a photo of this process?

  10. #10
    Join Date
    Jul 2002
    Location
    North Hills, CA and Pine Grove, CA
    Posts
    5,519

    Default

    Remove the paint from the motor mount surfaces.
    Be sure to visit;
    http://www.vintageamericanmotorcycles.com/main.php
    Be sure to register at the site so you can see large images.
    Also be sure to visit http://www.caimag.com/forum/

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