M62tu coolant leak from rear of engine, valley pan leak? - Bimmerfest - BMW Forums



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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 10-02-2018, 02:59 PM
donato_r donato_r is offline
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M62tu coolant leak from rear of engine, valley pan leak?

While doing some suspension work on my car, I happened to look at the transmission and noticed coolant dripping down from where the engine meets the transmission. Click image for larger version

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The majority seems to be coming from underneath that little rubber square in the middle. I fiddled with it a bit and as I did that more came out. A small amount seems to be coming from one of those vertical holes. I showed this pic to my mechanic and he said it was either a leak from the back of the engine that would require the transmission be dropped or the valley pan is leaking. How can I tell what it could be and just for now, can I post pone this and just keep adding coolant until I gain the confidence to attempt the valley pan job at a later date?


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  #2  
Old 10-02-2018, 03:34 PM
edjack edjack is offline
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Depends on how lucky you feel.

The RR corner of the valley pan can barely be seen, if you remove the sound cover. Evidence of a leak will be seen.
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Old 10-02-2018, 03:48 PM
Chedley Chedley is offline
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It is either the valley pan , or one of the coolant hoses at the back of the engine near the firewall. When they leak, coolant drops to the bottom of the engine where it is purged from that hole.
How much coolant are you losing ? if it is not significant, it is probably the hoses. But that could be more damaging as it could introduce air in the cooling system, and make the engine over heat.
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  #4  
Old 10-02-2018, 04:57 PM
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Burning2nd Burning2nd is offline
Under the lift arms
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sigh..... I feel really bad.. because i some how feel like im responsible for this

we had just been talking about this on another thread.. and i just knew it wasnt going to be long b4 i saw it on this side

I did mine

P#
11141729836
1729832

i was talking to the e60 guys about clutches in the n62, and i was thinking, that when i do my clutch in the 550 im replacing that cover... regardless if the design has been changed since the m62

On the n62 looking at the water pump gasket and looking at the rear engine coolant cover.. If its the same design, If my car has not already had it done Im sure ill be pulling the transmission for that plate soon


anyway....... M62 if your doing a clutch.. you replace that plate and gasket and cover. If your doing a rear cover plate, you do a clutch..... Dont go back there again
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Old 10-02-2018, 05:39 PM
ndz ndz is offline
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Verify its coolant and not AC oil. An evaporator leak can leave neon green AC oil under the center of the engine.
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Old 10-02-2018, 07:08 PM
JimLev JimLev is offline
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Do what edjack said. Get a flashlight and look at the top back of the block on either side of the CCV.
There are two drain holes, one on either side by the back of the pan, that allow the leaking coolant to drain out between the back of the block and the flywheel. It then drains out as shown in your pic.
It's almost always a valley pan leak.
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Old 10-02-2018, 09:22 PM
donato_r donato_r is offline
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Thanks for the suggestions everyone. Iíll probably look at the back of the engine sometime tomorrow. For now Iím just going to keep adding coolant because right now the car has some other problems that need to be addressed (BMW life)


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Old 10-03-2018, 10:11 AM
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I am thinking that looks like not the valley pan...I had a coolant leak at the back of the engine...the transmission and exhaust has to come out to get to the plate that leaks. Lots of bolts and the cover comes off. New gasket and bolt it back up...takes most of a day to do. Had them do the rear main seal as long as we were that far into it.
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Last edited by 540 M-Sport; 10-03-2018 at 10:23 AM.
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Old 10-03-2018, 11:38 AM
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Burning2nd Burning2nd is offline
Under the lift arms
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you can see the valley pan on the passenger side of the motor.. all the way to the back looking almost strait down,

you can see the lowest spot of the pan and where it accumulates b4 it overflows and runs down the motor..

If that corner is dry, the cover over plate is leaking
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Old 10-03-2018, 11:41 AM
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Quote:
Originally Posted by Burning2nd View Post
you can see the valley pan on the passenger side of the motor.. all the way to the back looking almost strait down,

you can see the lowest spot of the pan and where it accumulates b4 it overflows and runs down the motor..

If that corner is dry, the cover over plate is leaking
Agreed, it is pretty simple to remove the top engine cover and inspect with a flashlight
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  #11  
Old 10-03-2018, 12:10 PM
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Burning2nd Burning2nd is offline
Under the lift arms
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hmmm.. i cant remember if the top engine plastic was on or off the last time i did that check.. Its been years and years,

I dont use those engine covers
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Old 10-03-2018, 02:20 PM
donato_r donato_r is offline
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Another clue Iíve noticed; after about an hour or two of sitting is when a puddle is noticeable under the car so I donít know if that helps at all. Also where exactly should I be looking for this leak? As someone here said before, look by the passenger side for the pan but I just canít pin point it.


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  #13  
Old 10-03-2018, 02:36 PM
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Burning2nd Burning2nd is offline
Under the lift arms
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TOP of the motor.. passenger side, REAR strait down..
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Old 10-03-2018, 06:46 PM
JimLev JimLev is offline
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Quote:
Originally Posted by donato_r View Post
Another clue I've noticed;


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None of these posts are going to tell you squat. You need to look at the back of the engine where we told you. Remove the top engine cover and get a stool to stand on if you can't see it.
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Last edited by JimLev; 10-04-2018 at 12:27 PM. Reason: Typo
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