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Question on removing/installing headers

Discussion in '348/355' started by johnk..., Dec 28, 2020.

  1. Jackie and bill

    Jackie and bill Formula Junior

    Nov 29, 2014
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    William
    Yea I know Terry, have done for years. He and another guy (chas?) were some of the first to document various procedures years ago on the uk forum. Fcars.
     
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  3. johnk...

    johnk... F1 Veteran
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    Jun 11, 2004
    8,465
    New England/FL
    Moving right along, old header off. No big deal.

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    New header on. Getting it over the rear two studs took a bit of finagling and the center two nut were a little difficult to get started, particularly since I have Dupuytren's contracture in both hands. Leaving the front and rear top nuts as loose as possible and the bottom one loose gives more room to get your hand between the head and the air injection pipe. Frankly, poorly engineered. But driver's side is done. About 1 1/2 hrs from where I started today, including coming int he house to warm up a couple of time. Now, do I take off the cam coves and paint them or wait until the next major.


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  4. MAD828

    MAD828 Formula 3
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    Oct 8, 2011
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    Elliott Caras
    Wait until next major to pull the cam covers. They are easy to mark up when reinstalling and it would be hard to do so properly with engine in imo.
     
  5. johnk...

    johnk... F1 Veteran
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    Jun 11, 2004
    8,465
    New England/FL
    Just a little update that might be of interest. I scoped the driver's side OE header that I replaced and it shows no signs of deformation or cracks in any of the tubes. I can see some areas that have been subject to higher heat, apparently in areas where exhaust gases ejected from the heads impinge on the tubes. These are just small blemished areas. It will be interesting to how where the passenger's side header failed, cracks or melt through. It will also be interesting to see if there is any indication of 1-4 running rich due to excess air getting in the the exhaust stream. Plugs don't indicate such.
     
  6. PaulK

    PaulK F1 Rookie
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    Apr 24, 2004
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    Is there a particular direction that the manifold gaskets have to be facing (ie. there is a top and a bottom to the gaskets) when mating to the engine?

    Also, I would imagine that unless the headers are really bad that the cracks could be hard to see? My understanding is that they tend to crack around where the injection pipes meet the manifold, but could also crack around where the individual tubes combine. I have learned that the cars can develop a noise that sounds like 'lifter' tick but its really the cracks in the header letting sound "leak" out.
     
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  8. GatedF355GTB

    GatedF355GTB Karting
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    Dec 5, 2017
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    Yes. You'll be able to tell how they fit as long as you're observant. If you put them on wrong, the gasket will block part of the exhaust port.
     
  9. johnk...

    johnk... F1 Veteran
    Owner

    Jun 11, 2004
    8,465
    New England/FL
    I mounted the gaskets with the same orientation as the old ones but based on the type of gasket I don't see where it would make a difference.

    The headers were leak tested. The 5-8 bank header did (does) not leak. There are no cracks. I scoped it basically to see if there were any deformations of the tubes, as is show in some pictures, like this one. There were none in my 5-8 header. My 1-4 header showed leaks but due to the shields I was not able to determine where. However, it was apparent it was not around the air injection tubes they are completely exposed. When I remove it I will scope it to see where it leaks.

    If you look carefully at the picture below the top header, right most tube as a small light colored spot surrounded by rust. Similar "heat" spots were observed in all 4 tubes of my 5-8, but that was the extend of anything observable.

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  10. ShineKen

    ShineKen F1 Veteran
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    Aug 3, 2007
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    Leak or not. Stock manifolds are fugly underneath the shields. Ferrari needs shields to mask the quality.
     
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  11. drbob101

    drbob101 F1 Rookie
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    Nov 26, 2012
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    Bob Ferraris
    Just saw this thread. Good on you John for undertaking this. It ain’t easy at this age crawling around that engine.

    Is that a hole in the lower pic above?

    Where did you buy the Tubi from?
     
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  13. johnk...

    johnk... F1 Veteran
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    Jun 11, 2004
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    It's not that bad except this isn't the time of year for doing it in New England.

    The picture is just an example from the internet. Not my headers.

    I got the headers from Vivid Racing.
     
  14. drbob101

    drbob101 F1 Rookie
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    Nov 26, 2012
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    Bob Ferraris
    Do you have a lift? Does that make a difference?
     
  15. johnk...

    johnk... F1 Veteran
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    Jun 11, 2004
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    Targatime likes this.

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