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e60 ssk, zhp knob, brake ducts, ate super gold, ate brake shoes, pagid yellow rs19, pagid blue, titanium backing plates, dinan rsb, mk4 gps, vxx ae, brushed aluminum trim swap, gp2, bell sa2010, sparco tornado, sparco speed+ racing, 3mm front spacers, turner 32mm bolts, x5 thrust arm bushings, OE 9.5" squared 275/35/18 dunlop direzza zii, OE staggered 245/40-275/35/18 direzza z1 star spec, staggered style 66 on 235-245/45/17 blizzak ws70, pentosin mtf2, liqui moly 10w60, mobil1 0w40, ground control camber plates, bilstein b8 monotube dampers, intrax of holland racing springs*tbi
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dynojet 319ft-lb, 341whp, 13.51@104.3 englishtown, lime rock 1'09.9", lightning 1'23.420", thunderbolt 1'44.2", watkins glen *tbd, secret menu maf test, 138+ 2nd gear
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Favorite Quote: "Understeer is when you hit the wall with your front end. Oversteer is when you hit the wall with your back end. Horsepower is how hard you hit the wall. Torque is how far you move the wall when you hit it. "
Thanks guys for your ideas, there was a smaller gasket on the temp sender, that I had to sort of unscrew off the threads to put on the new one, could there have been a bigger one as well? I have just done a complete blank on where it came from...
You most probably nicked the new o-rings for the TStat housing. I went through a few before I realizes BMW were giving me the wrong size O rings! I ordered some nitrile ones in the correct size from another supplier and no more probs.
+1, thats the crush washer for the 4 way temp sensor. Like others said, you most likely cut an o ring when installing the new stat. Dont worry, it gets easier each time you do it!
I could probably get a tstat out in 20 minutes depending on how tight it is sealed to the engine block. The most time consuming step is draining the coolant, or in my case, pumping it out from the expansion tank.
There should only be the one crush washer with the temp sensor. I just changed mine and have the old one so will have a quick look. So not sure what your left over part could be?
If you find the source of the leak it may tell you, but it does sound like a nicked o-ring, it's super easy to do. See if you can feel around the back around the three pipes if there is moisture or even a bit of o-ring that was trapped and protruding.
Also, I'd suggest using KY Jelly on the o-rings if you do need to re-insall, water based lubricant is better for their long term life from what I've heard : )
PITA that this happened just before you head of on a road trip!! It's always the way...
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