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  #201  
Old 03-28-2017, 06:23 AM
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Quote:
Originally Posted by Stockx5 View Post
Mine would not rise above 68c
Few distinctions that might be of interest:

1. Instead of the OEM I bought Beck/Arnley 143-0904 Thermostat Housing. from ebay member 3wardist for $44.67. housing is identical except for the serials and bmw logo. the internals are not the same. you can see oem on the left here and the Arnley on the right.
mainly the Arnley has a bigger copper core, and the springs have a lot less travel than OEM. Which one is a better part not sure but I will be happy to post when it fails.




2. 2 of my t-45 torx nuts on the egr cooler had already been replaced by regular nuts presumably by the dealer. After dropping the non magnetic flange bolts 3 times and finally losing one of them I went to home depot and bought the identical length/thread bolts. this is the size in case someone is wondering.


3.I noticed the EGR valve which had been replaced 18k miles ago by dealer with the updated part was completely caked up in soot. So was the throttle valve and so was the intake manifold.


This is what came of the EGR valve alone

Id be interested to see others egr valves to see if this is normal caking up procedure for diesel engines or if this was caused by the failed thermostat or if this is just what egr cooler does to our egines the car has 103k miles.

Either way it seems a glow plug/injector/EGRvalve/catalitic converter/dpf filter/engine would not last long if this contamination was being constantly pumped in.
One of my EGR cooler flange bolts had been traded for a standard steel bolt. I found the original torx bolt laying in the plastic belly pan. I didn't find it until the job was done. So I have it in my tool box for the next time I have it all apart.


Your soot/cbu looks severe for only 18k miles. But that may be attributable to the cold running engine. The engine is made to run rich when not at temperature, and that makes a lot more soot.

If not for the dpf and catalysts, we would likely have a visual warning that there was an issue because the exhaust would be come darker.


I still can't believe how many of these diesels have failed thermostats and the dealer techs and private specialists still seem unaware of the issue or to check for it.
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2009 xDrive35D
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Deleted & Stg 2+ Tune for over 115k miles
227k on the clock
Being replaced by a 2016 X5d
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  #202  
Old 04-25-2017, 07:47 AM
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I'll be checking my thermostat temps this weekend while the wife is gone. EGR Cooler was already replaced under warranty about 13k miles ago (@41k). Wife drives a lot around town for work and I noticed yesterday her avg mpg was only around 20mpg. I'll reset it this weekend, take a nice drive on the hwy and around town and see what my average is. Compare figures and see if it's just her lead foot or if the t-stat temps aren't getting up to normal operating temperature.

Funny I noticed my mpg in the E39 M5 drop to around 15, and thermostat is replacement is in order (81k miles on original).
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2006 E46 M3 ZCP - SOLD
2011 E70 X5 35d - SOLD
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  #203  
Old 04-27-2017, 01:00 AM
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Lead foot in town is'nt grounds to cry about 20 mpg! It's a 26-28 highway with your foot not in it kind of car. I bought ,umm,a gauge guard.Instant temp readings among other features.
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  #204  
Old 05-04-2017, 12:19 PM
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Before replacing the Tstat, ours was barely managing 18.5mpg. After replacing it, it consistently gets around 25 with mixed driving and 27 on trips.
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2009 xDrive35D
Comfort seats, Tech, Premium, Cold Weather, Sport w/ Adaptive Drive, Extended Nappa Leather
Deleted & Stg 2+ Tune for over 115k miles
227k on the clock
Being replaced by a 2016 X5d
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  #205  
Old 05-05-2017, 01:07 AM
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My EGR before and after with 75k on the clock:



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  #206  
Old 05-05-2017, 12:02 PM
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Quote:
Originally Posted by Socale39 View Post
My EGR before and after with 75k on the clock:
Nice and clean! Did you just use solvents and a brush, or did you use ultrasonics?


I'd like to get my intake mani that clean, but I'm afraid solvents might attack the plastic.
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2009 xDrive35D
Comfort seats, Tech, Premium, Cold Weather, Sport w/ Adaptive Drive, Extended Nappa Leather
Deleted & Stg 2+ Tune for over 115k miles
227k on the clock
Being replaced by a 2016 X5d
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  #207  
Old 05-05-2017, 12:49 PM
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Acetone. Cuts through carbon more than any other solvent I tried. I also used it for my intake manifold as well.
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  #208  
Old 05-29-2017, 06:59 PM
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Well I used the ole Carly app today to get an idea about my temps. Outside temp was about 89 degrees with about 45% humidity. Traveled on the highway for a few miles at a steady 70mph with the AC on and it topped at just a hair under 77. Around town it would vary between 75-78 on and off load. Sounds like my numbers are low so I'll likely be ordering up the parts. I figure I might as well order up the thermostat, pump, idler, hoses and belts since I'll be in there.
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  #209  
Old 05-29-2017, 07:38 PM
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Pay attention to the fact that the AC belt requires a special tool to install and the primary belt is captive behind it.
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2009 xDrive35D
Comfort seats, Tech, Premium, Cold Weather, Sport w/ Adaptive Drive, Extended Nappa Leather
Deleted & Stg 2+ Tune for over 115k miles
227k on the clock
Being replaced by a 2016 X5d
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  #210  
Old 05-29-2017, 11:01 PM
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Quote:
Originally Posted by Socale39 View Post
Well I used the ole Carly app today to get an idea about my temps. Outside temp was about 89 degrees with about 45% humidity. Traveled on the highway for a few miles at a steady 70mph with the AC on and it topped at just a hair under 77. Around town it would vary between 75-78 on and off load. Sounds like my numbers are low so I'll likely be ordering up the parts. I figure I might as well order up the thermostat, pump, idler, hoses and belts since I'll be in there.

I got my Indy to do the water pump as well. Cost no more extra labor.
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