Thermo Time switch

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Utern
Posts: 28
Joined: Sat Oct 24, 2015 6:39 pm
Location: Kelowna BC Canada

Thermo Time switch

Post by Utern »

I am looking for help with an NLA Thermo Time switch, mine has died.

I have the switch and I think it could be revived if I could find the correct electronics.

My car is a 1982 633 CSiA (build date 12/81) an e12 based version, which I am finding has a number of odd parts that are very hard to find.
This switch is the version that has 2 prongs (not the vacuum hose attachments), this part tells the ECU to open the CSV (cold start valve) if the temperature is below 45CEL (45 degrees Celcius or aprox 110 degrees F)

#6 in this exploded view
https://www.realoem.com/bmw/en/showpart ... 2631279722

Temperature switch 45C part #12631279722

Thanks for helping me with this challenge

Cheers Utern
1982 633csi
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86_6series
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Re: Thermo Time switch

Post by 86_6series »

86-635CSi
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Utern
Posts: 28
Joined: Sat Oct 24, 2015 6:39 pm
Location: Kelowna BC Canada

Re: Thermo Time switch

Post by Utern »

Thanks for that suggestion 86_6series

I also found that listing, ordered the part and a day later got a call it was NLA and that they didn't have any inventory

I appreciate your help though

Utern
1982 633csi
bpoliakoff
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Re: Thermo Time switch

Post by bpoliakoff »

Contact Bluntech in Canada. They are great on older parts . They bring a lot of stuff in from Europe. The E12 guys love them. I am not sure where in Canada they are but are highly regarded.
81 Euro 635 M90 with motronic. Currently under a complete nut and bolt restoration. Pictures at
flickr.com/photos/bertsphotos.
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Bhart
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Re: Thermo Time switch

Post by Bhart »

Here's an article on a similar issue with bimetallic thermo timers (item #9 on your RealOEM doc) being NLA regarding Volvo ES with the D-Jet version of injection. There may be some cross referencing possible here. http://winkler.io/life-savers-for-owner ... -jetronic/
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Old-Thermal-Timer-with-Adapter-.jpg (866.61 KiB) Viewed 3656 times
01/1987 M6

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1970 2800CS
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Brucey
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Re: Thermo Time switch

Post by Brucey »

IIRC the part for early motronic is similar to ones fitted to later motronic; the difference lies in the time and temperature rating. If you fit the wrong rating of thermotime switch it is only a problem if

a) the temperature is between the two ratings and/or
b) the car cranks but doesn't start for some reasons.

Remember the thermotime switch ONLY allows the CSI to fire during cranking.


IME if everything is in good shape )no leaks in the fuel lines!) the car ought to start first crank and if it does, the exact rating of the thermotime switch is irrelevant.

If push comes to shove you can fit a momentary action switch in parallel with a failed thermotime switch and have a 'manual choke' as it were.

cheers
~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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