88C Thermostat for Non-Vanos M62??

[baneoh]

Please please don't tell me to search the forums, I have been searching for over an hour. I can find a ton of info on modding M62TU engines to run the 740d thermostat, but I can't find how to swap the thermostat on a 1998 540i M62!! From everything I have read, I am under the impression that there is a plug and play thermostat for the M62, but I can't find it. Can someone please steer me in the right direction?? Thanks.

[nike32]

Just buy a ready kit from eBay or somewhere
Abbes- Performance for example


Lähetetty minun ONEPLUS A5010 laitteesta Tapatalkilla

[baneoh]

Just buy a ready kit from eBay or somewhere
Abbes- Performance for example

Thanks for the response, but if it was that easy I would have found it already. Abbes seems to only have 80C which is too cold. All the kits on Ebay are for the M62TU, so that doesn't help.

[edjack]

The engine is designed to run circa 105 deg C.

[baneoh]

The engine is designed to run circa 105 deg C.

Duh

[Jaaap]

How about the 85°C
11531742964
It's for M60 and M62 i think?

[baneoh]

How about the 85°C
11531742964
It's for M60 and M62 i think?

That's a thought, but it seems most people agree that lower than 88C is bad. I know a ton of people have done this mod, I just can't seem to find the answer.

[jicaino]

Get the TU thermostat and swap the internals. Use the plug to replace the electrical connector, push in the ears and twist them. It wil come appart. Or just buy a quik hose and cut the rad end off and use it with a clamp on the radiator and the quick conect line on the TU thermostat.

[baneoh]

I found a 95C that seems to fit...??? That could be okay. Of course it's for the 840ci though, so it's rare and expensive.

https://www.fcpeuro.com/products/bmw...ci-11531745476

https://www.bimmerforums.com/forum/s...rks-well/page2

[jicaino]

Yes, that fits.

- - - Updated - - -

Again, not to rain on your parade, you won't get much answers as this has been covered and discussed ad nauseum in about half a dozen threads. With part numbers and examples and whatnot. You will always be told by knowitalls that BMW engineered the engine to run at 105ªC which is false and BS. The M62 family (which the S62 is a part of) has been known to run thermostats from 71ºC to 105ºC depending on application/market/weather.
Most likely your heatly engine won't suffer from a lower temp thermostat. You have to pick your oil accordingly to that and your region (weateher averages, usage of the engine)
85ºC is fine
88ºC is fine
95ºC is a tad high for my taste, great if you're trying to find a balance between cooling system's operation pressure and fuel economy
105ºC is definitely too high, nonsensical and just for squeezing out a couple of MPG decimals plus emissions.

[baneoh]

...not to rain on your parade, you won't get much answers as this has been covered and discussed ad nauseum in about half a dozen threads. With part numbers and examples and whatnot.

As usual, thank you for your advice. I PROMISE I searched. I even searched again for over an hour today while this forum was down, with no luck. Reading everything I can. If you know of a thread that is a good reference with clear explanations and part numbers then can you point me in that direction? I still can't piece it all together. It seems to me there should be a sticky that describes this mod in detail.

Also, I found contradicting info on the 840ci thermostat. I read somewhere that the housing is different?? Does that mean I get the housing for my car and swap just the thermostat?? Or do I have to retrofit the hose to the new housing like some suggest?????

I swear there is no thread that exists that clearly answers those questions for the M62. If you can prove me wrong I would be VERY impressed. I'm pretty sure I read the whole internet.

[CSMBlack-540i]

I'm pretty sure I read the whole internet.

Uhh, yeah, sure you did. The whole internet takes several lifetimes to read and you did it in a day? LOL

[baneoh]

Uhh, yeah, sure you did. The whole internet takes several lifetimes to read and you did it in a day? LOL

Good to see you got the joke. Thanks for the help, now I have it all figured out.

[baneoh]

^^I don't really have it all figured out, I just want to see if this guy can understand sarcasm if I make it even clearer.

Any help is appreciated. M62 Non-Vanos.

Thanks.

[CSMBlack-540i]

Last I heard, the solution to your question is available on the Dark Web since you already read all of the internet yesterday and couldn't find it.

[baneoh]

Last I heard, the solution to your question is available on the Dark Web since you already read all of the internet yesterday and couldn't find it.

Well played sir.

[baneoh]

So I may have some answers.

This is the first option. 95C, but I'm NEARLY positive that it is a direct bolt on replacement for M62: https://www.ebay.com/itm/For-BMW-E31...IAAOSwWCBZlWTI

My other option is to get the 88C thermostat for the M62TU and modify the end of the hose that goes in to the radiator. The problem with this option is no one has them in stock until March 26th, unless I want to buy the aftermarket thermo (which I don't): https://www.turnermotorsport.com/p-5...th-gasket-88c/

I think I finally have it mostly figured out. The thing I don't understand is, is there an 88C thermostat that fit's the M62 thermostat housing?? Or do all of us M62 owners have to cut the end of the hose? And can anyone link me to a thread where this has been done?

[jicaino]

You buy the 740d thermostat and remove the thermostat fron that housing and put it in the housing of your behr thermoelectric thermostat. You yank out the electric connectgor and replace it with the plug that comes in the 740d thermostat and thermostat housing assembly.
It's not that hard, actually. You can even figure it out by looking at them. If you're having troubles you may not enter in this quest actively, since you probably will not be able to make it work and will get frustrated and yell at your tools cussin us for "not aswering" to you. BTW, I already answered about the 95ºC thermostat from the 840ci above.

[baneoh]

You buy the 740d thermostat and remove the thermostat fron that housing and put it in the housing of your behr thermoelectric thermostat. You yank out the electric connectgor and replace it with the plug that comes in the 740d thermostat and thermostat housing assembly.
It's not that hard, actually. You can even figure it out by looking at them. If you're having troubles you may not enter in this quest actively, since you probably will not be able to make it work and will get frustrated and yell at your tools cussin us for "not aswering" to you. BTW, I already answered about the 95ºC thermostat from the 840ci above.

Thanks for answering above. The process seems simple, as long as i have the right parts. That is what I am trying to confirm. The most difficult part may be wiring in a resistor, which isn't difficult at all.

I can't seem to find the thermostat housing for my car sold separately, and I am guessing I shouldn't reuse the old housing, so does that mean I have to buy two thermostats? There isn't a separate part number for just the housing on Realoem and the original is plastic, right? Why does the OEM BMW stuff that is for sale now look like it's metal? Sorry for all the questions, but as you can see it's not as straight forward as it seems.

[jicaino]

Thanks for answering above. The process seems simple, as long as i have the right parts. That is what I am trying to confirm. The most difficult part may be wiring in a resistor, which isn't difficult at all.

I can't seem to find the thermostat housing for my car sold separately, and I am guessing I shouldn't reuse the old housing, so does that mean I have to buy two thermostats? There isn't a separate part number for just the housing on Realoem and the original is plastic, right? Why does the OEM BMW stuff that is for sale now look like it's metal? Sorry for all the questions, but as you can see it's not as straight forward as it seems.

Honestly man it's a lot easier than what you're imagining. Me I'd yank a good hose from a TU at a salvage yard and replace the o-ring. Your cooling system pressure will drop to about half of what's at now so even a used hose fitting is a safe bet. My car has a 21 years old hose fitted now. The new OE broke and I replaced the o-rings in the car's original hose and never replaced it after I received the new one.
To give you an idea of how safe is it with the 88ºC you can drive in the gas station right out of the hwy having beaten the car cruising near 135mph, and after/while you refuel you can open your cooling system without making a mess and burn yourself.
Another option would be to chuck the housing of the 740d tstat and turning it with a lathe.
I think (*think*) I may have one original Behr Germany that I can spare. Downside is that already paid customs duties on it but still better than what those are going for now, as we got them in group from a very very decent member here that fixed us with genuine made in Germany behrs for beer money.
I will report back tomorrow.

[philly98540]

Get the 85 degree stat. I forget part number, but FCP should have it. Call them up. There is no electrical connection, but is a direct bolt on. I’ve been using it for many years. Part number is in one of my threads somewhere.

[theWalkinator]

https://www.ecstuning.com/b-genuine-.../#tabDoesItFit

[philly98540]

That is the TU version.

for pre Vanos, this is the one to get
https://www.ecstuning.com/b-genuine-...t/11531742964/

it’s for gulf version of E31. Direct bolt on and correct hose connections.

[baneoh]

That is the TU version.

for pre Vanos, this is the one to get
https://www.ecstuning.com/b-genuine-...t/11531742964/

it’s for gulf version of E31. Direct bolt on and correct hose connections.

Thanks. So it looks like my options are:

(11 53 1 745 476) 95C from an E31 840ci or...
(11 53 1 742 964) 85C from an E31 Gulf version?

I feel like Goldilocks. 95C is too high and 85C just isn't high enough. Would one be better than the other?

[philly98540]

My 85 runs ktmp in low 90’s.