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Thread: Question on M50 alu thermostat housing gasket

  1. #1
    Join Date
    Aug 2006
    Location
    Boulder, CO, USA
    Posts
    195

    Default Question on M50 alu thermostat housing gasket

    I'm replacing a sticky thermostat and upgrading to an alu housing on my M50. The real oem diagram shows two gaskets. http://www.realoem.com/bmw/showparts...03&hg=11&fg=35
    The car is 1/92 build, and specs an early flat style gasket. Do i use that or the later style gasket as i'm using the metal housing?

  2. #2
    Join Date
    Jan 2004
    Posts
    4,150

    Default All of them that i have done have

    not had a groove in the aluminum housing for the profile gasket which is like a oval oring. They only took the flat paper gasket on the aluminum thermostat housing. The plastic housing has a groove in it for the profile gasket.



    Quote Originally Posted by colo525i
    I'm replacing a sticky thermostat and upgrading to an alu housing on my M50. The real oem diagram shows two gaskets. http://www.realoem.com/bmw/showparts...03&hg=11&fg=35
    The car is 1/92 build, and specs an early flat style gasket. Do i use that or the later style gasket as i'm using the metal housing?


  3. #3
    Join Date
    Sep 2005
    Location
    Dallas, TX
    Posts
    150

    Default

    Impossible to say without looking. I had an alum. housing on my car that used a flat gasket. When I replaced the housing, I received and alum. one that had a groove for the rubber profile gasket.

  4. #4
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
    Posts
    6,922

    Default

    the factory aluminum housing that came on the non vanos cars is flat with no groove and uses the paper gasket and round black o-ring for the thermostat, the aftermarket aluminum housing is patterned after the plastic housing and uses the black round thermostat o-ring and the funny shaped orange rubber seal that goes in a groove on the upper radiator hose side of the housing
    all america wants is cold beer warm cat and a place to take a poop with a door on it

  5. #5
    Join Date
    Mar 2006
    Location
    Ann Arbor Michigan
    Posts
    218

    Default

    I replaced the thermostat on my 92 M50 last week ( aluminum housing). I asked the auto parts store for any gaskets required. The dude said all the gaskets were in the box with the thermostat.

    I pull off the thermostat housing on the car and discovered no gasket between the aluminum housing and the engine. Only a O-ring around the thermostat.

    The thermostat box only contained the round O-ring.

    That seemed really stupid, but BMW knows best, anyway I resurfaced the housing and applies 4011 flange sealant (used for motorcycle engine cases).

    Works perfect.

    Oh, I also drilled a very tiny hole in the thermostat and installed the thermostat with the hole on the upside.

    The car runs about a tick below normal. Plenty of heat.
    SOLD!

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