E36 6Cyl Thermostat replacement

Guetzer

Member
Ok let me just start by telling you that if anyone tells you replacing a thermostat is not a bitch, they are probably lying, because it can be a biatch!!

So here is the process that I went through:

Day 1
Went to Midas, got a thermostat and some AF. The thermostat was like ~R50. After the rain faded a bit we started removing the thermostat housing, without removing the viscus fan, so there wasn't much space to work. Nevertheless we got it off and saw that the thermostat housing's rubber seal looked like... well like it was 15 years old. Luckily that was fixed with some gasket marker. The thermostat was sitting pretty tightly but managed to get it out. This is how the head looked(pic was taken after there had already been some gasket marker on):

mFjjTl.jpg


After the new thermostat was nicely seated we saw problem number 1: the seal Midas gave me was not going to work and in no way looked like an o-ring from the old one. But we tried to install it anyways but at this stage it was allready dark outside and we wanted to let the gasket marker set nicely before filling up with water and AF.

Day 2
Start filling up and water just starts pissing out of the housing area.... Took off the housing, saw the rubber was not going to work, went back to Midas and they told me I'm lucky i even got a rubber seal with the thermostat, and did not even have the right size o-ring. Then we started o-ring shopping and found nothing, eventually got an o-ring made at Pro Auto Rubber (shown below).

ABdgyl.jpg


Got back, thermostat fitted and some new gasket marker. And while I was still smiling and tightening one of the 4 bolts i just hear SNAP.... original thermostat housing cracked. Phoned a few places and this is the overall response: spare part places say they have second hand ones from ~R300 - R850, but some that didn't have anything said I should try Masterparts. Phone them and they tell me they have a new one for ~R200. Drive there in traffic to get the part, looked very nice and shiny compared to the original one:

G5UJ6l.jpg


Same process again, except this time there was no need for gasket marker as the new housing came with a new gasket. Happily i started tightening the bolts again... until another fucking disaster stuck, that dreadful "SNAP" sound :(... yup the brand new housing cracked just like that, its super duper duper fragile. So we gave up and by that time it was already dark again.

Day 3
Did some more research and found out that the metal housing for the m50 motor will fit the m52 as well. Phoned a few people and they said the same thing, Masterparts. Phoned them and they said sure we have the metal ones they are ~R150!!!! Sooo... basically a shitty fragile plastic thermostat housing is ~R200 and the aluminium one is ~R150 (Hopefully this will save someone R200 and a self inflicted kick to the head in the future). Here is the aluminium housing:

SnNgnl.jpg

9rIozl.jpg


And so by this time I have become a pro at removing and installing the thermostat housing with very little space. Installed everything, filled up with water and AF, bled it, started the car (after the battery that was dead for some reason had been charged again). No leaks, no problems and engine gets to its temp in about 3mins.

Here it is all installed:
Ctlb9l.jpg
 

Raybimmer

New member
I had the same story a while ago ...but the :argh: aluminium housing costs R350 here in East London :bangdesk:
 

Guetzer

Member
Raybimmer said:
I had the same story a while ago ...but the :argh: aluminium housing costs R350 here in East London :bangdesk:

hahaha shit that sucks! But at least now that it's done it'l last a while :rollsmile:
 

Guetzer

Member
maximus said:
Guetzer said:
maximus said:
lol same box as mine (aluminium thermo housing) :)

haha thats pretty kewl :p did yours come with one originally?

the housing? original was plastic.

ohh i heard some of the m50 motors come with alum ones :p

gconry18 said:
Nice! Done this a couple times already, fun fun.

haha this was my first time but i got quite a bit of practice now :rollsmile:

PrevanP said:
well done. good info for other e36 owners :thumbs:

Always awesome to share helpful info to fellow fanatics! :thumbs:
 

topclub

New member
Had same problem last week replaced original with a plastic one since the suppliers did have the aluminum one and cracked it and got another plastic and PRAYED, just managed a big headache :rollsmile:
 

Jacques L

New member
Thanks for this post. I replaced mine on the 323i about 3 weeks ago. Removed radiator and everthing to get to it. I don't know how you managed to get it out, but I will certainly try next time.:bravo:
 
I think there is market for selling the fanatics torque wrenches !

I too have broken my fair share in my time, got the 330i, got me a torque wrench - it's a must have as the torque needed for most parts borders on finger tight with a little "nip".
 

Guetzer

Member
Charlie Brown said:
I think there is market for selling the fanatics torque wrenches !

I too have broken my fair share in my time, got the 330i, got me a torque wrench - it's a must have as the torque needed for most parts borders on finger tight with a little "nip".

I really need a torque wrench! :rollsmile:
 
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