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Testarossa thermostat housing leak

Discussion in 'Boxers/TR/M' started by JohnMH, Dec 6, 2024.

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  1. JohnMH

    JohnMH Formula 3

    Jan 28, 2004
    1,821
    Bologna
    #1 JohnMH, Dec 6, 2024
    For some reason I used a little high temp sealant when I changed my thermostats about 5 years ago. The housing weeped at the seam slightly afterwards. Now it is time to address the issue as my engine is about to go back in.

    Can I assume that my sealant idea was just a dumb idea? Does anyone else use a small amount of sealant when they install new thermostats? Obviously both seals and thermostats will be new when I put it together.
     
  2. Rifledriver

    Rifledriver Three Time F1 World Champ

    Apr 29, 2004
    37,106
    Cowboy Capitol of the World
    Full Name:
    Brian Crall
    #2 Rifledriver, Dec 6, 2024
    Never. Factory uses no sealant and we never had issues with how they did it. Cannot improve on perfection.
     
  3. ago car nut

    ago car nut F1 Veteran
    Silver Subscribed

    Aug 29, 2008
    5,502
    Madison Ohio
    Full Name:
    David A.
    #3 ago car nut, Dec 6, 2024
    Check to see if housing is warped or something!
     
    Steve Magnusson and turbo-joe like this.
  4. JohnMH

    JohnMH Formula 3

    Jan 28, 2004
    1,821
    Bologna
    #4 JohnMH, Dec 6, 2024
    Thanks. Proof a good design can be defeated by misguided good intentions.
     
  5. EDoug

    EDoug Formula Junior

    Apr 19, 2005
    271
    Southern Florida
    #5 EDoug, Dec 6, 2024
  6. turbo-joe

    turbo-joe F1 Veteran

    Apr 6, 2008
    9,540
    southwest Germany, France ( Alsace ) and Thailand
    Full Name:
    romano schwabel
    #6 turbo-joe, Dec 6, 2024
    only a little bit silicone sealant ( RTV ) will not be a mistake and wait 2 days until really dry before putting in coolant. but you do this with engine out then it is enough time to dry.
    but also have a look at the drain plug - thread ok? ( 10300240, 130282 )and the gasket ( 10297760 )
     

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