Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E65 / E66 (2002 - 2008)

7 Series - E65 / E66 (2002 - 2008)
Discussion pertaining to the flagship BMW here.

Reply
 
Thread Tools Display Modes
  #1  
Old 11-10-2013, 08:17 PM
rangernu rangernu is offline
Registered User
Location: Texas
 
Join Date: Nov 2009
Posts: 16
Mein Auto: 750Li
2006 750Li coolant leak seems to be coming from the the rear of the block

Two weeks ago I noticed a wet spot on the ground after my car had been parked on an incline for several days. Coolant level low alarm came on when I started. Checked the reservoir and coolant level was low. I topped it off and drove home.

Decided to park it in my driveway, which is inclined, and see if it happened again. It did.
I jacked the car up and removed the metal shield for a closer look and to snap a few pictures.

Click image for larger version

Name:	20131110_182551.jpg
Views:	197
Size:	90.2 KB
ID:	406829

Click image for larger version

Name:	20131110_182203.jpg
Views:	227
Size:	137.5 KB
ID:	406830

Does anyone have any experience with coolant leaking from above this location?
Additionally, when I park the car on a level surface I not seeing the fluid dripping.
Any insight would be appreciated.
Reply With Quote
Advertisement
  #2  
Old 11-10-2013, 08:19 PM
First_745Li's Avatar
First_745Li First_745Li is online now
Officially Welcomed to the 'Fest
Location: South FL
 
Join Date: Jun 2012
Posts: 2,450
Mein Auto: 2007 Audi A8
2006 750Li coolant leak seems to be coming from the the rear of the block

Rear of the block.. Sounds like the rear cover plate .. Going to have to drop the tranny to get to it.


Sent from BimmerApp mobile app
__________________


'11 328i (sold)
'07 Audi A8
'03 745Li (sold)
'03 Acura TL-S (sold)
'15 Toyota Sienna Limited Premium w/Dynamic Cruise
'15 Infiniti Q50 Premium w/NAV & 19'' Wheels


www.balanceyourbodyph.com
Reply With Quote
  #3  
Old 11-10-2013, 08:25 PM
rangernu rangernu is offline
Registered User
Location: Texas
 
Join Date: Nov 2009
Posts: 16
Mein Auto: 750Li
Quote:
Originally Posted by First_745Li View Post
Rear of the block.. Sounds like the rear cover plate .. Going to have to drop the tranny to get to it.
Thanks for the reply :-)
The mechatronics unit was replaced in August by the stealership. You think it is possible that they damaged a seal or some such with the rear cover plate?
Reply With Quote
  #4  
Old 11-10-2013, 08:48 PM
PAPER's Avatar
PAPER PAPER is offline
CRISP & CLEAN
Location: on the moon
 
Join Date: Jul 2009
Posts: 3,089
Mein Auto: Ford Pinto
Quote:
Originally Posted by First_745Li View Post
Rear of the block.. Sounds like the rear cover plate .. Going to have to drop the tranny to get to it.


Sent from BimmerApp mobile app


could still be the coolant Pipe rear seal .
Reply With Quote
  #5  
Old 11-10-2013, 08:54 PM
rangernu rangernu is offline
Registered User
Location: Texas
 
Join Date: Nov 2009
Posts: 16
Mein Auto: 750Li
Quote:
Originally Posted by PAPER View Post
could still be the coolant Pipe rear seal .
Thank you for the insight Paper. I was just looking at repair videos for the coolant pipe and did notice the rear seal. I did not know if the rear seal fails coolant will leak out and down the rear of the block. Is there any way to conclusively determine this other than removing the intake manifold and valley pan for pipe replacement?
Reply With Quote
  #6  
Old 11-11-2013, 01:45 AM
BMW_tech's Avatar
BMW_tech BMW_tech is offline
Officially Welcomed to the 'Fest
Location: halfway there
 
Join Date: Sep 2007
Posts: 2,019
Send a message via Yahoo to BMW_tech
Mein Auto: rickshaw
You MUST really look into locating the exact source of your coolant leak. It might be a simple fix if its only the valley pan or the o-ring on the waterpump pipe abpve it. Just look below the intake manifold at the back. If its wet up there, it wont be as hard as if it was leaking well below it. The possibilities are only few but it gets easier once you locate the source. Come see me or someone like me. Goodluck
Attached Thumbnails
Click image for larger version

Name:	130.png
Views:	106
Size:	9.0 KB
ID:	406860  
__________________
YOUR SECRET ADMIRER
Reply With Quote
  #7  
Old 11-11-2013, 06:05 PM
First_745Li's Avatar
First_745Li First_745Li is online now
Officially Welcomed to the 'Fest
Location: South FL
 
Join Date: Jun 2012
Posts: 2,450
Mein Auto: 2007 Audi A8
2006 750Li coolant leak seems to be coming from the the rear of the block

Quote:
Originally Posted by PAPER View Post
could still be the coolant Pipe rear seal .
Paper that's right, could be that as well.



Sent from BimmerApp mobile app
__________________


'11 328i (sold)
'07 Audi A8
'03 745Li (sold)
'03 Acura TL-S (sold)
'15 Toyota Sienna Limited Premium w/Dynamic Cruise
'15 Infiniti Q50 Premium w/NAV & 19'' Wheels


www.balanceyourbodyph.com
Reply With Quote
  #8  
Old 11-11-2013, 06:06 PM
First_745Li's Avatar
First_745Li First_745Li is online now
Officially Welcomed to the 'Fest
Location: South FL
 
Join Date: Jun 2012
Posts: 2,450
Mein Auto: 2007 Audi A8
2006 750Li coolant leak seems to be coming from the the rear of the block

Quote:
Originally Posted by rangernu View Post
Thanks for the reply :-)
The mechatronics unit was replaced in August by the stealership. You think it is possible that they damaged a seal or some such with the rear cover plate?
Highly unlikely that it's related.


Sent from BimmerApp mobile app
__________________


'11 328i (sold)
'07 Audi A8
'03 745Li (sold)
'03 Acura TL-S (sold)
'15 Toyota Sienna Limited Premium w/Dynamic Cruise
'15 Infiniti Q50 Premium w/NAV & 19'' Wheels


www.balanceyourbodyph.com
Reply With Quote
  #9  
Old 08-28-2014, 03:40 PM
springwater springwater is offline
Registered User
Location: USA
 
Join Date: Aug 2014
Posts: 35
Mein Auto: Gremlin
Quote:
Originally Posted by rangernu View Post
Two weeks ago I noticed a wet spot on the ground after my car had been parked on an incline for several days. Coolant level low alarm came on when I started. Checked the reservoir and coolant level was low. I topped it off and drove home.

Decided to park it in my driveway, which is inclined, and see if it happened again. It did.
I jacked the car up and removed the metal shield for a closer look and to snap a few pictures.

Attachment 406829

Attachment 406830

Does anyone have any experience with coolant leaking from above this location?
Additionally, when I park the car on a level surface I not seeing the fluid dripping.
Any insight would be appreciated.
Same thing just happened to me. Ive got the front of the car jacked up and it started to leak coolant.

But it may just be a coincidence as I had the front jacked up not too long ago when I did the oil change (no leak at that time).

It seems as though its accumulating in the steel metal pan before dripping out.

Now to try and find the source...

Last edited by springwater; 08-28-2014 at 03:41 PM.
Reply With Quote
  #10  
Old 08-29-2014, 07:46 PM
Silent_dog Silent_dog is offline
Officially Welcomed to the 'Fest
Location: Sydney
 
Join Date: Sep 2009
Posts: 119
Mein Auto: 745Li
The rear seal should not cause leak. It can exchange coolant between forward and return path, but it should not leak ouside the coolant path.

There is a video showing the leak from the rear U shape bracket. Search for coolant leak rear engine should find.the video. The valley pan cover gasket leak would collect coolant on the side of the cover, when you park the car on a slop ground, the leaked coolant could drip out.

Sent from BimmerApp mobile app
__________________
2003 745Li. Water pump, AGA pipe, valley pan cover, reservoir. Water cooled alternator bracket gasket. MAF. Vanos solenoid seals. Cam's position sensor seals. Removed and physically checked guibo, as new. Transmission oil pan, sleeves, adapter. Oil sensor, Oil pressure switch. Used RightStuff silicon to seal the following: upper timing cover, vacuum pump inner seal, lower oil pan. MacGyver style without parts: hood open cable, boot hydraulic system.

2007 320i. RightStuffed vacuum pump.
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E65 / E66 (2002 - 2008)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 03:34 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms