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Thread: Will Longer Intake Manifold Bolts in Short Bolt Spots Cause Problems?

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    Default Will Longer Intake Manifold Bolts in Short Bolt Spots Cause Problems?

    When I removed the intake manifolds on my '93, the two short bolts were on cylinder #1 in the outside spot and cylinder #3 in the outside spot. They've been like that since I bought the bike in 2001. I reinstalled them that way.

    However, I just discovered that the short bolts are supposed to be on cylinder #2 in the outside spot and cylinder #3 in the outside spot. That means I've been running a long bolt in that cylinder #2 spot for 17 years. I've never noticed a problem.

    https://www.venturerider.org/forum/s...arb-boot-bolts

    Click image for larger version. 

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    What are the consequences of having a long bolt in a short bolt position?

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    Default Re: Will Longer Intake Manifold Bolts in Short Bolt Spots Cause Problems?

    Quote Originally Posted by Bob K. View Post

    What are the consequences of having a long bolt in a short bolt position?
    The longer bolt will break through into the head nut recess, with the likelihood of an oil leak at the intake port.
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    Go here for an example and the fix:

    http://www.bikersassociationofnorthd...renovation.htm

    Scroll down in his post to the identified problem.
    Last edited by Prairiehammer; 10-08-2018 at 12:18 PM.
    Kevin M. Campbell Hidden Content
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    Default Re: Will Longer Intake Manifold Bolts in Short Bolt Spots Cause Problems?

    A very enjoyable read about the VMax build.
    Thank you, Kevin!
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    Default Re: Will Longer Intake Manifold Bolts in Short Bolt Spots Cause Problems?

    Interesting. The long bolt has been there since I purchased the bike--presumably installed incorrectly by the previous owner or his motorcycle shop--however, I've never noticed any problems or oil leaking into the #2 cylinder. No oil burning, no fouled plug, no buildup in the intake portion above the intake valve, no loss of oil.

    Oil does leak out of the hole when the bolt is removed, but as I understand from other posts, this is normal, and that's why the bolt needs sealant on it during reinstallation. Is that correct?

    I'll swap the bolts and see what happens.

    Is there anything in particular I should keep an eye out for?

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    Default Re: Will Longer Intake Manifold Bolts in Short Bolt Spots Cause Problems?

    Quote Originally Posted by Bob K. View Post

    Is there anything in particular I should keep an eye out for?
    Only thing I can think of is that the torque for the short bolt is about half that of the longer bolt. Don't strip it out!

    Frankly, I'm not sure I would mess with it. The minor damage done by the incorrect long bolt will not be fixed by the substitution of the correct shorter bolt.

    As an aside: the parts diagram is the reason for the (probably) many examples of the long bolt in the wrong location. Notice, even though the part number describes a 16 mm long bolt, the diagram clearly shows the longer (20mm) bolt in that location.
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    Default Re: Will Longer Intake Manifold Bolts in Short Bolt Spots Cause Problems?

    Quote Originally Posted by Prairiehammer View Post
    As an aside: the parts diagram is the reason for the (probably) many examples of the long bolt in the wrong location. Notice, even though the part number describes a 16 mm long bolt, the diagram clearly shows the longer (20mm) bolt in that location.
    I noticed that, too! #7 is supposed to be the short bolt, but in the fiche, it's drawn as longer than the #6 bolt. Dang artists!
    Last edited by Bob K.; 10-09-2018 at 12:00 AM.

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