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348 Coolant Leak under Plenum

Discussion in '348/355' started by AceMaster, Sep 11, 2021.

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  1. AceMaster

    AceMaster Three Time F1 World Champ

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    #26 AceMaster, Sep 11, 2021
    Once you pull out the bolts on the back of the intake you can just set aside the air injection solenoids. Not necessary to unplug it, just set out of the way.
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  2. AceMaster

    AceMaster Three Time F1 World Champ

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    #27 AceMaster, Sep 11, 2021
    Ok, now you're ready to pull the plenum out to see what's going on down there. Double and triple check that everything has been disconnected and is out of the way. In Ernie's case, he had to lift the plenum (but not completely take it out), tip it back to disconnect the vacuum line for the intake compensation valve, then fish the MAF & TB connectors back and out through the intake runners. For some reason mine wasn't wired this way. Either way, when you're slowly lifting your plenum out, have someone look underneath to see if you need to do this the same way Ernie did. In my case, I didn't, I just removed the plenum and it came right out.

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  3. AceMaster

    AceMaster Three Time F1 World Champ

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    #28 AceMaster, Sep 11, 2021
  4. AceMaster

    AceMaster Three Time F1 World Champ

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    #29 AceMaster, Sep 11, 2021
  5. AceMaster

    AceMaster Three Time F1 World Champ

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    #30 AceMaster, Sep 11, 2021
  6. AceMaster

    AceMaster Three Time F1 World Champ

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    #31 AceMaster, Sep 11, 2021
    Water/coolant stains.....turns out the clamp was stripped. The hose/sleeve itself was still in perfect condition. Cost of this is $64 from Ricambi, I ordered it and replaced it regardless since I had it apart anyways. It is # 40 in this drawing. I also ordered replacement clamps (obviously), #41 in the diagram
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  7. AceMaster

    AceMaster Three Time F1 World Champ

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    #32 AceMaster, Sep 11, 2021
    All in all, not a bad job, just takes time and patience (and a strong back HAHAHA).

    Before I put the injectors back in place (attached to the fuel rail line), I cleaned the carbon build up with brake cleaner, and applied a little bit of vaseline around the o-rings.
     
  8. AceMaster

    AceMaster Three Time F1 World Champ

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    #33 AceMaster, Sep 11, 2021
    I will add this the 348 DIY thread shortly....
     
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  9. John Glen

    John Glen Formula Junior

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    #34 John Glen, Sep 11, 2021
    Hope you inspected p/n 42 in the diagram. Mine was crumbling and leaking. Replaced with Hill Eng stainless steel fitting.
     
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  10. AceMaster

    AceMaster Three Time F1 World Champ

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    #35 AceMaster, Sep 12, 2021
    I did not. Is that accessible with the plenum in place? What is that part called and what is its function? Once I found the source of the leak I didn't think to check anywhere else.
     
  11. m.stojanovic

    m.stojanovic F1 Rookie
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    #36 m.stojanovic, Sep 12, 2021
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  12. John Glen

    John Glen Formula Junior

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    #37 John Glen, Sep 12, 2021
    Nice job Miroljub, mine wasn't corroded as badly but almost. To remove the fitting I put a drill bit that was a close fit inside the tube such that I could clamp some vice grips around it without it crumbling.....Also applied some heat to the manifold casting to aid in removal.
     
  13. ernie

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    #38 ernie, Sep 12, 2021
    ATA boy Mikey! Great job!
     
  14. AceMaster

    AceMaster Three Time F1 World Champ

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    #39 AceMaster, Sep 12, 2021
    Thank you Ernie. Thank you for your intake/plenum removal thread. That was the inspiration for me to do this myself
     
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  15. Ricambi America

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    #40 Ricambi America, Sep 13, 2021
    Mike - It is this: https://www.ricambiamerica.com/106241-union.html
     
  16. AceMaster

    AceMaster Three Time F1 World Champ

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    #41 AceMaster, Sep 13, 2021
  17. itsablurr

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    #42 itsablurr, Sep 15, 2021
  18. AceMaster

    AceMaster Three Time F1 World Champ

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    #43 AceMaster, Sep 15, 2021
    Exactly :D
     
  19. Manuel.G

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    #44 Manuel.G, May 13, 2025
    To remove that hose (122219), is it necessary to follow this tutorial and remove everything, or can it be done without removing anything? I see the clamp is difficult to remove.
     
  20. AceMaster

    AceMaster Three Time F1 World Champ

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    #45 AceMaster, May 13, 2025
    which hose?
     
  21. Manuel.G

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    #46 Manuel.G, May 13, 2025
  22. AceMaster

    AceMaster Three Time F1 World Champ

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    #47 AceMaster, May 13, 2025
    I can double check for you in a few days, but to the best of my knowledge you cannot get to that house without removing at least a few things
     
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  23. Manuel.G

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    #48 Manuel.G, May 14, 2025
  24. Manuel.G

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    #49 Manuel.G, May 14, 2025
  25. m.stojanovic

    m.stojanovic F1 Rookie
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    #50 m.stojanovic, May 14, 2025
    I bought it in a shop in Kuala Lumpur selling brass fittings, hydraulic fittings, etc. The original fitting is as shown in an earlier post here but, with the amount of corrosion, I didn’t even try to unscrew it. Instead, I cut it, drilled out and cut a new thread matching the brass fitting.
     
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