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Old 11-26-2006, 12:11 AM   #1 (permalink)
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Date registered: Oct 2004
Vehicle: 99ML320
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Oil Leak

Guys I need help identifying where the oil leak is coming from or anybody has experience this leaking. The oil is dripping from the bottom bolt of the a/c compressor, see attached pic. I've replaced the timing case cover gasket but that didn't stop the leaking. So the timing case cover is not the cause. Any help would be appreciated.

Jay
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Oil Leak-oil_leak.jpg   Oil Leak-timing_case_cover.jpg  
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Old 11-26-2006, 08:27 AM   #2 (permalink)
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just a guess....

Quote:
Originally Posted by NorCal_ML320
Guys I need help identifying where the oil leak is coming from or anybody has experience this leaking. The oil is dripping from the bottom bolt of the a/c compressor, see attached pic. I've replaced the timing case cover gasket but that didn't stop the leaking. So the timing case cover is not the cause. Any help would be appreciated.

Jay
my guess is the oil in the AC system....but like I said its just a guess
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Old 11-26-2006, 09:40 AM   #3 (permalink)
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Looks to me that you will have to pull the a/c compressor off and take a better look at things. You don't have to discharge the system.
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Old 11-26-2006, 03:27 PM   #4 (permalink)
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I am not jumping under my truck to see it, but judging from the picture this is holding bolt for the compressor?
Meaning there should not be oil behind it?
I've been tracking oil leaks on my cars for years and they seldom appear where they actually leak. At high speed the air under the hood runs in strange patters, pushing oil into the places where it doesn't belong.
Before taking the engine apart, I would wash the oil very well and recheck it after short drive.
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Old 11-26-2006, 04:15 PM   #5 (permalink)
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Check the oil neck, the black plastic extension trough wich you pour oil in the engine! Mine was leaking and after i replace it the oil leak disappear ! Take the cover off from the top of the engine four a day or two , clean and dry the oil neck very good and drive the car ! If this is leaking you will see it and for sure the oil will show in the area wich you pictured it ! It worth trying ! Good luck !
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Old 11-26-2006, 10:00 PM   #6 (permalink)
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thanks guys for the response.


I don't think the oil is coming from the compressor. The engine oil actually getting lower every thousand miles by approximately a quarter of a quart.

The oil seems to be coming from the front of the engine but I can't see it because the belt tensioner and the harmonic balancer is in the way.

Talking about the harmonic balancer, I noticed that one side of the rubber insert is sticking out between 1/16 and 1/8 of an inch. This might be the cause of the leak due to vibration of the unbalance harmonic balancer and thus causing the seal to leak. This is my third balancer that this truck has gone through. I'm looking for an indie shop in san jose, ca area. If anyone has good experience with one, please let me know.

Jay
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Old 12-01-2006, 11:07 AM   #7 (permalink)
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My '98 is leaking oil in the same location. I have not yet found out the source, but I was thinking it might be the valve cover. Let me know if you find out the source.

Thanks.

Steve
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Old 12-16-2006, 01:32 PM   #8 (permalink)
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I am having the same leak on my 99 ML430, only the fluid appears to be reddish in color. When I checked the power steering reservoir, it was not down and also the fluid seemed to be light brown, not red. I am getting a little puddle every day so it's a decent leak.

Is there any way transmission fluid could be getting to the front of the engine compartment and end up dripping off the AC compressor bolt?

Took it to local dealer and they wanted over $2k to fix leaks and nothing sounded like it could be causing this. They said $800 to reseal the shifter paw and several hundred more to do the oil pan. This is definitely not the oil pan and way far forward for the shifter paw, I'm pretty sure. It seemed like a scam so I didn't have them do anything.

Any help out there will be greatly appreciated.
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Old 12-16-2006, 01:50 PM   #9 (permalink)
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Oil spilt during filling seems to end up there. The dealer changed my oil when I picked up the car, and it ended up dripping from the same place.

I was doing some winterization work, so while I was in there I just sprayed down the whole side of the (cold) engine block with Brake Cleaner, scrubbed it off, and it hasn't come back.
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Old 12-16-2006, 03:34 PM   #10 (permalink)
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Quote:
Originally Posted by johnhinesaz
Is there any way transmission fluid could be getting to the front of the engine compartment and end up dripping off the AC compressor bolt?
.
There are transmission cooling lines going inside radiator. Hoses are clamped with simple clamps. I had to adjust one because of leak on those in the past.
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