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WTB M90 Thermostat Housing Cover

Posted: Thu May 17, 2018 5:00 pm
by Hefeweizen
Looking for a thermostat housing cover (with a thermostat housing if you don't want to seperate). It is for a M90 engine (yes) and I do not have a part number. The one for the M30 engine (no) fits but the angle is off and the hose bulges.

Re: WTB M90 Thermostat Housing Cover

Posted: Thu May 17, 2018 11:24 pm
by tschultz
Does it cross reference to any e12's? Hoping you can find it from a different engine.

Re: WTB M90 Thermostat Housing Cover

Posted: Fri May 18, 2018 2:08 am
by bpoliakoff
Early M90 is Ljet injection and therefore will use a housing from any pre 81 M30 motor.

Re: WTB M90 Thermostat Housing Cover

Posted: Fri May 18, 2018 4:38 pm
by Hefeweizen
tschultz wrote: Thu May 17, 2018 11:24 pm Does it cross reference to any e12's? Hoping you can find it from a different engine.
Thanks,

I sure hope so too! Right now, for the time being I blocked the bleeder screw mechanism off meaning I plugged the hole. Not really an ideal situation. You can see on the picture that the angle on the E24 cover is different.

Re: WTB M90 Thermostat Housing Cover

Posted: Sat May 19, 2018 3:07 pm
by Pasocb
bpoliakoff is exactly correct. I have a M90 with a December 1981 build date ((Motronic) and it’s thermostat housing looks like the one you don’t want (I attempted to add a photo). The L-Jet 633s here all match what you are after.
4FD26AD2-D486-4830-898B-4638EC5BBD79.jpeg
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Re: WTB M90 Thermostat Housing Cover

Posted: Sat May 19, 2018 3:29 pm
by Hefeweizen
What does your radiator and hose look like? The radiator I have in does not accommodate the the regular E24 hose. Changing out the radiator opens up another can of worms ](*,)

Re: WTB M90 Thermostat Housing Cover

Posted: Sat May 19, 2018 5:29 pm
by Pasocb
I do have the car apart right now. The hose number looks like it is 3404 - 06. Seems that BMW relocated the hose fitting to clear the Motronic distributer. The radiators look identical.
8EC6EE37-6612-4C06-B3EE-03D5EB2DB89A.jpeg
8EC6EE37-6612-4C06-B3EE-03D5EB2DB89A.jpeg (1.86 MiB) Viewed 58861 times

Re: WTB M90 Thermostat Housing Cover

Posted: Sat May 19, 2018 10:47 pm
by tschultz
The top hose is also different I think.

Re: WTB M90 Thermostat Housing Cover

Posted: Sun May 20, 2018 4:14 pm
by Pasocb
The top hose on the December 1981 m90 Motronic is the same as the 1980 L-Jet. See picture with loose 81 hose sitting on top of 1980 installed.

Re: WTB M90 Thermostat Housing Cover

Posted: Sun May 20, 2018 10:53 pm
by Hefeweizen
Pasocb wrote: Sat May 19, 2018 5:29 pm I do have the car apart right now. The hose number looks like it is 3404 - 06. Seems that BMW relocated the hose fitting to clear the Motronic distributer. The radiators look identical. 8EC6EE37-6612-4C06-B3EE-03D5EB2DB89A.jpeg
Did research online and did not find anything with that number for the hose. I think that would be the most ideal situation to get a hose like that which would fit. I have a few housings for the M30B34 so that is not a problem.

Re: WTB M90 Thermostat Housing Cover

Posted: Mon May 21, 2018 3:28 pm
by tschultz
Get the part number from real oem such as a 1980 M535i which used the same engine. Or as others have suggested, an E12 633 ](*,)

Re: WTB M90 Thermostat Housing Cover

Posted: Tue May 22, 2018 1:14 pm
by Hefeweizen
tschultz wrote: Mon May 21, 2018 3:28 pm Get the part number from real oem such as a 1980 M535i which used the same engine. Or as others have suggested, an E12 633 ](*,)
Tom, you never fail to amuse me by thinking all the answers are at real oem. Sometimes it is not that easy. Bottom line is that I am looking for a thermostat cover (used). I appreciate the suggestions to buy a new one and I even entertain the thought of getting a hose, really.

Re: WTB M90 Thermostat Housing Cover

Posted: Tue May 22, 2018 6:40 pm
by tschultz
It seems to be there when I looked. :-k
BMW Part #: 11531714861
Hose: 11531266462

Shows on E3, E12, E24, E28---Specifically different from e28 based housing/cover. Of course you must look to see which specific models it came on, and it shows early M30 cars(as others suggested, LJet model) up to production 9/80.


Available new here: https://www.ecstuning.com/b-genuine-bmw ... 531714861/


EDIT: I see you are looking for used. A bit pricey new but the Ljet cars are rare these days-- even for spare parts!

Re: WTB M90 Thermostat Housing Cover

Posted: Wed May 23, 2018 3:09 pm
by Hefeweizen
Thank you Tom!