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Discussion Starter #1
Aloha all,

I was poking around the engine bay as I was looking at my large list of things to do for the M and I happened to check in the coolant reservoir. In there I found what looks to be soot/black particles....and my heart sank....

I have done an oil change and the oil was not milky. My coolant level has been consistent, still green, and I have not had any cooling problems other than the occasional code 69. I have plans to have a compression and leak down test done and the car will sit until then.

To my knowledge the coolant hasn't been flushed any time within the last 3 to 5 years. I would love to find that that residue in the coolant reservoir is the result of deteriorating coolant hoses.

Has anyone had this kind of problem and it not be head gasket failure? I know I can't really say much else until I get the test results.

Help much appreciated.
 

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There are numerous o-rings and seals in the coolant circuit, including the large seal around the t/s which has looked pretty rough in some photos I have seen on here. I would be more inclined to suspect that you are seeing remnants of a seal exposed to coolant that is hardening and breaking up rather than evidence of a head gasket leak.

There is a fairly cheap kit you can get for testing coolant for combustion gases. I have never used it so I don't know how well it works.

Amazon.com: Lisle 75500 Combustion Leak Detector: Automotive
 

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Discussion Starter #3
Finally got around to taking some pics of this.

<a href="http://smg.photobucket.com/user/vsupra123/media/M5/photo2-2.jpg.html" target="_blank"><img src="http://img.photobucket.com/albums/v248/vsupra123/M5/photo2-2.jpg" border="0" alt=" photo photo2-2.jpg"/></a>
<a href="http://smg.photobucket.com/user/vsupra123/media/M5/photo1-3.jpg.html" target="_blank"><img src="http://img.photobucket.com/albums/v248/vsupra123/M5/photo1-3.jpg" border="0" alt=" photo photo1-3.jpg"/></a>
 

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Discussion Starter #5
Thank you for the reassurance. I've actually out a lot on hold since finding this thinking it could be head gasket failure. Still going to get the compression test done though....assuming the hurricane on the way here dissipates.


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thats not a bad idea but as i said don't sweat that little bit of crap in the expansion tank. pull the drain plug from the radiator, and the plugs on each side of the block. drain the old coolant, flush the system out good with a hose, then refill. just make sure you use distilled water, not tap. also stay far away from products like water wetter or purple ice, they do nothing but make a mess of the cooling system.
 

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thats not a bad idea but as i said don't sweat that little bit of crap in the expansion tank. pull the drain plug from the radiator, and the plugs on each side of the block. drain the old coolant, flush the system out good with a hose, then refill. just make sure you use distilled water, not tap. also stay far away from products like water wetter or purple ice, they do nothing but make a mess of the cooling system.
Ditto what he said. Doesn't look bad in there although it's interesting that your finger swipe looks greasy. If it was my car I would also completely flush the system and refill with new BMW coolant and distilled water. Of course make sure to completely wipe out the reservoir so you know it's clean when your down. Then just keep an eye on it. Finally I would do the compression test. It's a good thing to do to check the general health of the engine anyway. I plan to do mine soon. Make sure to follow the method posted here so that you get proper readings.
 

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Discussion Starter #8
I don't have the tools to do the compression check so I plan on having it done. Got quoted $175 for the check from a local indie. Was planning on having my cousin do it but not sure when he'll be free.

Thanks for all the good advice guys!


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I don't have the tools to do the compression check so I plan on having it done. Got quoted $175 for the check from a local indie. Was planning on having my cousin do it but not sure when he'll be free.

Thanks for all the good advice guys!


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Either way, I'd print the "directions" that are saved in our DIY section. It's the best way to get accurate numbers and probably not what the shop had in mind. (ie they probably didn't budget that much time)
 

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Either way, I'd print the "directions" that are saved in our DIY section. It's the best way to get accurate numbers and probably not what the shop had in mind. (ie they probably didn't budget that much time)
Please help this OF out here... can't seem to find this 'DIY Section' you reference, either under the Forums, the FAQ or elsewhere... 'course I'm half blind and probably be looking it square in the eye and jes can't see it so appreciate ya'll humoring me... Or perhaps it goes by a different name officially an I ain't smart nuff ta figure that out.

FWIW a link to such stuff ref'd in a post is always nice... saves questions from feeble minded folks like me... ';)

TIA...

IMSARS69
 

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I thought BMW coolant was blue.
 
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Please help this OF out here... can't seem to find this 'DIY Section' you reference, either under the Forums, the FAQ or elsewhere... 'course I'm half blind and probably be looking it square in the eye and jes can't see it so appreciate ya'll humoring me... Or perhaps it goes by a different name officially an I ain't smart nuff ta figure that out.

FWIW a link to such stuff ref'd in a post is always nice... saves questions from feeble minded folks like me... ';)

TIA...

IMSARS69
Take a look in the 'sticky' threads on the front page of the forum…

http://www.m5board.com/vbulletin/e39-m5-e52-z8-discussion/69610-tech-how-accurately-compression-test-s62-engine.html
 
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