328 air injection line question | FerrariChat

328 air injection line question

Discussion in '308/328' started by UpNorth, Oct 7, 2017.

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  1. UpNorth

    UpNorth Formula 3
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    Sep 30, 2006
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    Francois
    Image Unavailable, Please Login Image Unavailable, Please Login Hi all,
    I have a 1986 328 GTS US model. Looking at the air injection line diagram there is a hose from the air box to the injection steel tube.
    Looking at the engine in the car all I see is the injection steel tube but with a cap at the end as you can see on my (lousy) picture.
    Can someone explain this to me?
    TIA
     
  2. cmt6891

    cmt6891 Formula 3

    Feb 25, 2008
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    Carl T
    I assume the picture is of your front bank and the hose pictured is just under the expansion tank? Where does the hose go to? You are missing the emissions check valve, #3, in the parts photo. Do you have it on the rear bank air injection tube? Looks like you might be missing the cutoff valve as well, #1, in the parts diagram.
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
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    Metal NPT pipe caps replacing the check valves, items 3, is a way to disable the air injection system (not as bad a thing to do on a 328 as it is a 2-valve engine). However, it's better to replace items 18 & 19 with the available aftermarket 4V threaded plugs/washers as this allows you to preserve the air injections manifolds, items 4 & 5, off the car (and living next to a hot exhaust manifold isn't easy ;)).
     
  4. yelcab

    yelcab F1 World Champ
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    Nov 29, 2001
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    I have the same. It's because the rusted T pipe is expensive and the whole air injection system based on the vacuum principle i.s a joke. Drive it and forget about it
     
  5. UpNorth

    UpNorth Formula 3
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    Thanks!! That's what I wanted to read because *cough* as I drove down the street out of my entrance yesterday I heard a metallic noise coming from behind. I looked in the miror and saw a piece of pipe in the middle of the street. I went for a no problem drive. Back home I realised it is the end part of the air injection line of the front bank.
    Glad to know it's useless because replacing this where it should go would be a PITA.
     
  6. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    If you mean a piece of the 5-8 air injection manifold, item 5, physically broke off, that would be a serious issue as hot exhaust gas would be leaking into the engine bay (even though the engine would still run fine) - is that what happened?
     
  7. cmt6891

    cmt6891 Formula 3

    Feb 25, 2008
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    The T-pipe is expensive when purchased as a Ferrari part, that's IF you can find it. IIRC those hoses are 21mm and you can go to Home Depot and but a plumbing brass T 0.75". Works like a charm and no more corrosion.
     
  8. UpNorth

    UpNorth Formula 3
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    Looks like the part that broke off is the segment between part number 3 and the main section of 5. But as I mentioned instead of part 3 and all the hoses thereafter there is only a cap at the end of the broken off section. I cannot post a photo since I am away from the car for two weeks nos.
     
  9. yelcab

    yelcab F1 World Champ
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    If that is the case, you are getting exhaust in the engine bay. You will need to fix that by removing (5) and plugging all holes up with plugs.
     
  10. UpNorth

    UpNorth Formula 3
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    Geez...Do I have to pull the engine out for that?? Just had a major done last winter! *sigh*
     
  11. cmt6891

    cmt6891 Formula 3

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    Full Major or just timing belts? If the plenum and cam covers came off for the service, it would be hard to miss the corroded air injection pipe. That would have been the time to plug the holes.
     
  12. yelcab

    yelcab F1 World Champ
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    If it is the front bank, you are looking at a full weekend. Not a fun job. Remove the passenger wheel, AC, alternator, gas tank, and reach all the way in to remove the header, then the injector rails. It is a really royal pain in the butt.
     
  13. UpNorth

    UpNorth Formula 3
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    Just the belts.
     
  14. UpNorth

    UpNorth Formula 3
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    Yes it’s the effing front one...
     
  15. UpNorth

    UpNorth Formula 3
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    Looking at the price some sponsor here is selling these plugs I'm just wondering if someone has the info on what can be bought at a hardware/plumbing supply place instead if ever possible...
    TIA
     
  16. UpNorth

    UpNorth Formula 3
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    Another idea I had: Could I simply pluck that hole with some kind of muffler putty so I don't have to make the equivalent of a hearth surgery on my car until the next major?
     
  17. moysiuan

    moysiuan F1 Rookie
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    Nov 1, 2005
    4,192
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    Maybe get a big short bolt that would just fit in the end of the broken tube, slather it with high temp muffler weld putty eg. JB Weld Extreme Heat and that should be fine. You just want to keep exhaust gas from leaking out there. It can wait til your next major service, just check it from time to time, make sure the other one isn't ready to go as well.
     
  18. UpNorth

    UpNorth Formula 3
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    Thanks Andy,
    That's what I tought too!
    The back one looks fine.
     
  19. kcabpilot

    kcabpilot Formula 3

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    #19 kcabpilot, Oct 23, 2017
    Last edited: Oct 23, 2017
  20. UpNorth

    UpNorth Formula 3
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    Just did that last week end. Seems to do the job. Thanks!:cool:
     

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