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  1. #1
    Master Lancista Professorgearhead's Avatar
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    Header bolt question

    I just installed the Omicron Group 4 exhaust system on my '72 1600, and I must say that the quality of the header, in particular, is fabulous. Fit and finish of everything was exemplary. Here’s the thing: I’m having trouble sealing the header to the head. I can hear those little farty/hissy sounds that suggest a leak-though there isn’t sufficient room for me to get my hand in there to feel pulses of air. Because of the equal length header pipes, the header is a bag of snakes with essentially no room to swing a wrench. What is the maximum (safe) torque for the header bolts, and does anyone have any tricks for sealing a header to the head (and yes, I installed a new exhaust gasket). Thank you in advance.
    Thor Frohn-Nielsen
    '72 Lancia Fulvia 1600

  2. #2
    Legendary Lancista lancialulu's Avatar
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    Re: Header bolt question

    I have one of these. It is difficult to get anything other than an opened short spanner on to the bolts. And with around a six inch length it is not possible to get the M8 bolt too tight. I never use a new gasket.... and try to bolt up gently all round going from bolt to bolt till I can do no more. A 1/12th at a time.....

    But are you sure you are not ge5 confused with the 4 into 2 connection which is a slip fit and held by springs. It does not really seal until the pipes get very hot??”

  3. #3
    Legendary Lancista Fulvia-hf's Avatar
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    Re: Header bolt question

    My HF has got the EVO cars manifold and that gives the same clearance problems. I opted for Alen bolts. With a special T-grip spanner you do not have to be on an 90 degree angle to turn the bolt as the tip is a bit rounded if you know what I mean. This did the trick.

    Cheers,
    william

  4. #4
    Master Lancista Norvox's Avatar
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    Re: Header bolt question

    As William states, Alen bolts was also included when I got my grp 4 manifold from Italy. Same clearance issues no matter who build it.
    Nikolaj Skovron
    1971 Lancia Fulvia 1,3S Coupe

  5. #5
    Master Lancista Professorgearhead's Avatar
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    Re: Header bolt question

    Alen head bolts are a great idea. Duhhhhhh........ I’m actually thinking that the sounds may indeed come from the sleeved parts, where the two sections are held together by springs, because the sound seems to be coming from that end of the engine. There’s no way I can get a torque wrench onto the header bolts, but I’m assuming that the amount of pressure I can assert on a 13mm spinner is insufficient to strip the threads, no mater how hard I crank on them (which isn’t really very hard, considering the awkward position).

    I will investigate further. Thank you!
    Thor Frohn-Nielsen
    '72 Lancia Fulvia 1600

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    Re: Header bolt question

    The allen key the rounded tip is generically referred to as a 'Bondhus key' Bondhus make all sorts of keys with this ball/hex feature, can be found on Amazon etc..

    Quote Originally Posted by Fulvia-hf View Post
    My HF has got the EVO cars manifold and that gives the same clearance problems. I opted for Alen bolts. With a special T-grip spanner you do not have to be on an 90 degree angle to turn the bolt as the tip is a bit rounded if you know what I mean. This did the trick.

    Cheers,
    william

  7. #7
    Master Lancista Professorgearhead's Avatar
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    Re: Header bolt question

    Anything for an excuse to buy more tools. Done!!
    Thor Frohn-Nielsen
    '72 Lancia Fulvia 1600

  8. #8
    Legendary Lancista lancialulu's Avatar
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    Re: Header bolt question

    Quote Originally Posted by Phil-m View Post
    The allen key the rounded tip is generically referred to as a 'Bondhus key' Bondhus make all sorts of keys with this ball/hex feature, can be found on Amazon etc..
    can you get them bondhus at both ends of an allen key?

  9. #9
    Master Lancista bernt's Avatar
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    Re: Header bolt question

    Quote Originally Posted by lancialulu View Post
    can you get them bondhus at both ends of an allen key?
    I don't think so. I've only ever seen them as T-grip or angled, with the ball end on the long side.

    Bernt

  10. #10
    Legendary Lancista bmarler's Avatar
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    Re: Header bolt question

    you can get double ended here.
    http://bondhus.com/pages/stubby-double-ball-end
    bmarler/
    1967 fulvia sport zagato
    1961 appia vignale convert.

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