348 Coolant Hose - OOPS!

Discussion in 'Technical Q&A' started by Miltonian, May 19, 2005.

  1. Miltonian

    Miltonian F1 Veteran

    Dec 11, 2002
    5,910
    Milton, Wash.
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    Jeff B.
    #1 Miltonian, May 19, 2005
    Last edited by a moderator: Sep 7, 2017
    I found a puddle of antifreeze under my 348 the other day, and after a quick search, I found that the source was the hose that runs from the bottom of the expansion tank to the fitting under the intake plenum chamber. I noticed a long time ago that it was starting to swell, but I didn't do anything about it. Well, take a look at the picture, it was ROTTEN !

    Next question, can it be replaced without too much grief? Answer, YES! After removing the air filter housing and disconnecting the throttle linkage to get it out of the way, and moving a few other bits and pieces, I was able to reach under there and undo the clamp with a 1/4" drive socket. A new section of 9.5mm Gates rubber hose cost less than $3.00! The whole job only took about 90 minutes - why didn't I do it a long time ago???

    I ran out of time to get the system fully bled before night fall, but I'll have it done early tomorrow.

    348 owners, take a look under there and make sure your hose doesn't look like mine did!
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  2. Dcup

    Dcup F1 Veteran

    Jan 3, 2005
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    Claude Balls
    thanks for the info jeff !!!!
     
  3. ernie

    ernie Two Time F1 World Champ
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    Nov 19, 2001
    21,219
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    Nice work Jeff. You will also want to pay attention to the other hose that is under the intake. It is the one the runs from the water pump to the front of the crossover pipe. I have heard of those being over looked during the engine out major. If that one busts it is a bigtime pain in the neck to replace it with the engine in the car.
     
  4. harleyx49

    harleyx49 Karting
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    Jun 26, 2013
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    Hutchinson, MN
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    Mike
    Had the same coolant issue after the first drive of the season, coolant all over garage floor.
    I could see the expansion tank hose going to the block was leaking.
    After letting the engine cool down overnight I removed the hose with just a long flat screwdriver no engine parts removal.
    Order a new hose and hope I can get it reinstalled without having to remove any parts.
    The coolant was pink in color and would anyone have a suggestion what kind of coolant "Brand" I should refill with.
    Can different coolants be mixed ? Will the engine self bleed itself ?

    Thanks everyone,
    Mike
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  5. harleyx49

    harleyx49 Karting
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    Jun 26, 2013
    94
    Hutchinson, MN
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    Mike
    Had the same issue after first drive of the season, coolant all over the garage floor.
    I could see the expansion tank hose to the block was leaking. I let the engine cool down overnight and the next day I was able to remove the hose with just a long flat screwdriver. Order a new hose and hope that I can reinstall without having to remove any engine parts.
    The coolant was pink in color, does anyone have a suggestion on what coolant I should refill "Brand" with?
    Can coolants be mixed and will the system self bleed itself ?

    Thank inadvance for your help,
    Mike
    View attachment 2545639
     
  6. harleyx49

    harleyx49 Karting
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    Jun 26, 2013
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    Hutchinson, MN
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    Mike
    Sorry, duplicate post !
     
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  8. wda24729

    wda24729 Formula Junior
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    Sep 22, 2014
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    Graham
    Qavion and ///Mike like this.
  9. yelcab

    yelcab F1 Veteran
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    Nov 29, 2001
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    Mitchell Le
    you can sell that !!!
     
  10. ///Mike

    ///Mike F1 Veteran
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    Dec 11, 2003
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    Bugtussle
    Indeed!
     
  11. AceMaster

    AceMaster Two Time F1 World Champ

    Feb 6, 2009
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    Mike
    The system will not self bleed, you will need to do that but it's a fairly easy procedure.

    As for coolant, I have been using Prestone
     
  12. POLO35

    POLO35 Formula Junior

    Feb 21, 2005
    263
    Treasure Coast Florida
    Full Name:
    MATT
    Nice write-up. I took a look at mine last night and it is all swelled up as well so I will be doing this repair this summer. Did a little research and the aluminum nipple under the plenum is actually the exact same part number as the 328 and a nice stainless steel replacement is available from Hill engineering at Ricambi for 40 bucks. It's quite nice and I had to replace mine on the 328 cuz the nipple was just about corroded off! I'll have to see how it is on the 348.
     
  13. harleyx49

    harleyx49 Karting
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    Jun 26, 2013
    94
    Hutchinson, MN
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    Mike
    Finally got my 9.5mm "3/8" inch coolant hose installed this morning.
    Really a pretty easy fix, I just took off the four nuts on the air box and loosen the hose clamps for the sleeves that go into the suction manifold.
    I then could rotate the box up enough for my son to slip the hose onto the nipple and tighten the clamp, rerouted the other end of the hose to the expansion tank.
    Service the tank, started the car and put the heater on high but no warm air was coming out so decided to crack open the coolant bleeder screws.
    Top one open easily but bottom one was not cooperating as it was on so tight I thought I was going to bust it off.
    I just kept working the screw back and forth a little more each time until I finally got it out. Some the threads had metal in the grooves so thought I would just order new ones. They were either not available or you had to order at least $250.00 worth of parts or they would not ship, these screws are about $2.00 each.
    Got a little more motivated to see if I could clean up this bleeder and maybe reuse it.
    I removed the metal from the threads, clean it on my wire wheel and reinstalled it easily and then just snug up the screws, started engine and no leaks.
    Now getting heat coming out the vents and could see coolant in the expansion finally going down, just need to put a little more in.
    Took me longer to post this than the actual repair !
     
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