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Old 31st December 2012, 02:50   #1
manualshifter
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Changed stat-coolant leak and part left over

Changed Stat yesterday, had an alloy washer left over- any idea where it's from?

Coolant dripping from bell houssing after test drive...

Guess I have to start over..damn.
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Old 31st December 2012, 06:01   #2
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Did you remove the drain plugs from the block? Looks like the metal washer used for those.
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Old 31st December 2012, 07:25   #3
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No, didnt get that far, was about to change coolant when I saw the driipping from the rear of engine.

After stat change I Topped up lost coolant with de mineralised water, was going to change coolant when sure I was leak free..

Didn't take plenum off either.

What a pain, had to set off on 500km roadtrip today in the Lexus... z.
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Old 31st December 2012, 07:36   #4
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Crush washer for the 4 way temp sensor, #12 here. RealOEM.com * BMW E39 M5 Waterpump - Thermostat
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Old 31st December 2012, 07:37   #5
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You most likely ripped an 0-ring on installation.

That ring washer could possibly be the seal for the temp sending unit on top of the t-stat housing...
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Old 31st December 2012, 07:47   #6
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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...
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Old 31st December 2012, 17:47   #7
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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.
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Old 1st January 2013, 01:32   #8
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+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!
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Old 1st January 2013, 02:00   #9
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Lube them o-rings up with Vaseline!

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.
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Old 1st January 2013, 02:57   #10
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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...

Last edited by M5 Sydney; 1st January 2013 at 02:59.
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