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355 Water Pump

Discussion in '348/355' started by kalinsd, Oct 10, 2016.

  1. kalinsd

    kalinsd Formula Junior

    Apr 14, 2010
    413
    Washington
    Full Name:
    DJ
    #1 kalinsd, Oct 10, 2016
    Last edited by a moderator: Sep 7, 2017
    Think the water pump seal is on the way out. Left side of clutch housing is showing signs of antifreeze, while the other side is clean. Also, the antifreeze is showing on the oil sump. If not the water pump, what might it be?

    BTW, the car does not drip any coolant onto the floor.

    Thanks in advance.

    DJ
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  3. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    10,631
    San Carlos, CA
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    Mitchell Le
    I am not sure that would be my diagnosis.
     
  4. PAP 348

    PAP 348 Moderator
    Moderator Owner

    Dec 10, 2005
    86,801
    Mount Isa, Australia
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    Pap
    Something is starting to weep DJ, that's for sure.

    Can you pressure test the cooling system yourself?

    If not, take it to someone who can pressure test the cooling system for you so you/they can inspect for leaks.

    It could be the water pump, but it could be a hose clamp that needs to be nipped up a 1/4 of a turn.

    Definitely have the cooling system pressure tested, it's the only way to know for sure what is leaking mate.
     
  5. dougburhyte

    dougburhyte Karting

    Dec 28, 2005
    166
    Full Name:
    Douglas Burhyte
    DJ - Could be the seal, as it does fail in the 355. I had a similar problem... smelled a bit of anti-freeze while driving with the targa top removed but didn't have visible signs of a leak. If you have a means to pressurize the cooling system to, say, 5-10 psig, which I think is close to normal when the engine is warm and running, you might be able to detect some leakage around the seal. Mine was pretty minor, so I lived with it for a couple of years until I had the engine-out service performed. Hope this helps.

    Doug
     
  6. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    10,631
    San Carlos, CA
    Full Name:
    Mitchell Le
    If the water pump seal fails, the water drips out of the weep hole under the pump, gets splashed around by the spinning action of the belts and sprays it to the left front of the engine.

    The leaks onto the case of the transmission points to a possible coolant leak over the top of the engine. There are so many possibilities. A pressure test will tell right away.
     
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  8. kalinsd

    kalinsd Formula Junior

    Apr 14, 2010
    413
    Washington
    Full Name:
    DJ
    Thanks everyone. Pressure Test It Is!

    Best,

    DJ
     
  9. PAP 348

    PAP 348 Moderator
    Moderator Owner

    Dec 10, 2005
    86,801
    Mount Isa, Australia
    Full Name:
    Pap
    Good man, please let us know what happens. :)
     
  10. kalinsd

    kalinsd Formula Junior

    Apr 14, 2010
    413
    Washington
    Full Name:
    DJ
    Need to get this pressure test completed. Would like to get a recommendation on which tester to purchase.

    Thanks and will report back on what is found on this poor old and tired 355....
     
  11. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    10,631
    San Carlos, CA
    Full Name:
    Mitchell Le
    Install the new waterpump. Fill car with coolant. Apply Stant pressure tester unit to the coolant tank (with a specific tank cap adapter). Watch for leaks.
     
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