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Old 06-17-2013, 06:35 PM   #1
toslow OP
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81 r100rs oil cooler question

I've got an 81 r100rs with the factory oil cooler problem is after a ride i 95 degree heat the cooler is not warm I don't think the thermostat is opening up can the thermostats go bad or what should I look for thanks
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Old 06-17-2013, 06:50 PM   #2
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Inside the thermostat housing is a brass cartridge filled with wax that when hot forces a small pin against the piston, opening the thermostat ports.

Your brass cartridge or 'expanding element' is kaput.
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Old 06-17-2013, 07:43 PM   #3
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Inside the thermostat housing is a brass cartridge filled with wax that when hot forces a small pin against the piston, opening the thermostat ports.

Your brass cartridge or 'expanding element' is kaput.
can you limp it and get thermostat operation with the drain bolt? I know you can just put a stick in place of the cartridge to hold it open.
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Old 06-17-2013, 08:03 PM   #4
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can you limp it and get thermostat operation with the drain bolt? I know you can just put a stick in place of the cartridge to hold it open.
We can get away without the cooler full stop.
Yes, the drain bolt will hold the thermostat fully open (only trouble is that it's not a drain bolt, it's a priming bolt )
Priming bolt is ideally 23mm long. 25 mm will also work.
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Old 06-17-2013, 08:45 PM   #5
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My R100RT acts the same way. Cooler is only hot if the bikes sits while running a long time. Average temp is 225-235F with a dip stick thermometer.
Take the cartridge out and put it in hot water and bring to a boil. Watch if the prong extends out near boiling (212F)
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Old 06-17-2013, 10:32 PM   #6
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We can get away without the cooler full stop.
Yes, the drain bolt will hold the thermostat fully open (only trouble is that it's not a drain bolt, it's a priming bolt )
Priming bolt is ideally 23mm long. 25 mm will also work.
Fascinating. how do you drain your cooler when changing oil. nothing comes out of mine without I install the drain bolt. It refills just fine with pressurized oil to do it...
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Old 06-18-2013, 12:14 AM   #7
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Fascinating. how do you drain your cooler when changing oil. nothing comes out of mine without I install the drain bolt. It refills just fine with pressurized oil to do it...
I disconnect the cooler lines from the thermostat.
With a load of cold new oil the thermostat is closed.
If the thermostat is defective, it will take a while (if ever?) for the radiator to fill.
There's only about 100 ml in the radiator and lines from memory.
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Old 06-18-2013, 12:42 AM   #8
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I have the priming/drain bolt I think it's part# 11 42 1 335 394 and if you install it will it keep the thermostat open all the time? is it OK to run it that way in the real hot months ?
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Old 06-18-2013, 01:18 AM   #9
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I have the priming/drain bolt I think it's part# 11 42 1 335 394 and if you install it will it keep the thermostat open all the time? is it OK to run it that way in the real hot months ?
I took my thermostat off. Worked fine I guess but just not my style. I replaced it with a R80G/S oil cover. This one had lines for the oil cooler but no thermostat. oil cooler all the time. There is a bypass in the cover that never closes so some oil goes to the cooler always, some bypasses always.

I just asked ME|1181^-2| and he said...
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Old 06-18-2013, 01:24 AM   #10
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I have the priming/drain bolt I think it's part# 11 42 1 335 394 and if you install it will it keep the thermostat open all the time? is it OK to run it that way in the real hot months ?
The longer bolt (23~25mm) will keep the thermostat open. Yes, it's ok to run it like that.
Certain GS's have oil coolers and no thermostat.
If your 'cartridge' is defective, and I think many will be by now if they've not been replaced, it won't make any difference anyhow.
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Old 06-18-2013, 01:29 AM   #11
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Old 06-18-2013, 02:21 AM   #12
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If you live in a temperate/cool climate, I reckon that you are more likely to harm your engine by running it too cool than running it too hot and in those climates I would run a thermostat. HPN and Motoren Israel make neat and tidy thermostats.
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Old 06-18-2013, 02:26 AM   #13
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If you live in a temperate/cool climate, I reckon that you are more likely to harm your engine by running it too cool than running it too hot and in those climates I would run a thermostat. HPN and Motoren Israel make neat and tidy thermostats.
There's no need for a cooler in those climates tho'

I doubt the oil cooler does much to lower oil temp significantly on a bloody hot day, even when it is operating as designed.
It would be interesting to test with an oil temp gauge.
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