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  #16  
Old 04-09-2009, 05:34 PM
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That's what I said on benzworld.org. I asked him did they simulate operating conditions, (pressure/temp)
I never recieved an answer on that one.

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  #17  
Old 04-15-2009, 03:44 PM
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Quote:
Originally Posted by M.B.DOC View Post
Simply request them to replace the cooler! You are paying the BILL! Ask them to save the old one!

Most likely a small crack opens up under HEAT & Pressure conditions.
I have an update. Had it towed to the dealer and they ran the car for 2 hours. No overheating, but more oil left the crankcase into the cooling system (about 2 quarts). They are suggesting doing the head gasket again and replacing all parts (radiator, hoses, coolant reservoir) at a cost of 4K! I asked them about the oil cooler and they said that wasn't the problem. They didn't test it, but they said it wasn't the problem. Does the radiator have anything that would allow oil into the coolant.
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  #18  
Old 04-15-2009, 04:13 PM
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A quart an hour is a big leak, especially at idle, and I can't say I've ever seen a torqued-down headgasket leak like that (not that my sample size is all that big). Plus, your mechanic already re-did the gasket and nothing changed.
1. Believe your indications (lesson learned from 3-Mile Island)
2. Doing the same thing but expecting different results is (used as) a definition of insanity.
The 3rd thing is that replacing the radiator (with oil cooler) will only run you about $200 (recent auction site offer) if you do it yourself.
DIY
I would do that before looking further at the headgasket and block.
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  #19  
Old 04-15-2009, 04:33 PM
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WHY not simply listen to experience & TELL them to replace the oil cooler??

MB part number 104-180-03-09 ($288 list) with gaskets & labor ...$600

They can clean the complete system with MB citric acid powder.



Most likely that IS the problem...UNLESS you think your original tech can't install a head gasket!
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  #20  
Old 04-15-2009, 04:49 PM
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M.B. DOC knows what he is talking about. Either have the dealer replace the oil cooler or DIY.
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  #21  
Old 04-15-2009, 05:20 PM
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Replace the oil cooler, hmmmmm............. I know I've heard that before..............let me think. .
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  #22  
Old 04-15-2009, 08:39 PM
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Quote:
Originally Posted by Hirnbeiss View Post
A quart an hour is a big leak, especially at idle, and I can't say I've ever seen a torqued-down headgasket leak like that (not that my sample size is all that big). Plus, your mechanic already re-did the gasket and nothing changed.
1. Believe your indications (lesson learned from 3-Mile Island)
2. Doing the same thing but expecting different results is (used as) a definition of insanity.
The 3rd thing is that replacing the radiator (with oil cooler) will only run you about $200 (recent auction site offer) if you do it yourself.
DIY
I would do that before looking further at the headgasket and block.
Hirnbeiss,

Would you do the radiator before doing the oil cooler, or are you saying that both should be done at the same time. And, how hard is it to change the oil cooler?
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  #23  
Old 04-15-2009, 08:59 PM
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the rad has nothing to do with motor oil.

REPLACE THE OIL COOLER
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #24  
Old 04-15-2009, 09:09 PM
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Originally Posted by 79Mercy View Post
the rad has nothing to do with motor oil.

REPLACE THE OIL COOLER
Ok. Is it hard to do?
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  #25  
Old 04-15-2009, 09:20 PM
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I sent you the wrong DIY - sorry. Your oil cooler is mounted underneath the oil filter, and to access it you need to remove the upper intake manifold.
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  #26  
Old 04-15-2009, 09:24 PM
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yeah I believe its pretty involved
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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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  #27  
Old 04-15-2009, 09:28 PM
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Just an idea if your mechanic is right about the oil cooler being okay. Could you be losing the oil in another way while you are actually getting transmission into the coolant. I admit I don't know this model very well, but in certain cars there is a possibility of transmission entering the coolant via a transmission fluid cooler. Just an idea. I guess there still needs to be a reason for the oil disappearing.
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  #28  
Old 04-15-2009, 09:42 PM
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Quote:
Originally Posted by nckmsn View Post
Just an idea if your mechanic is right about the oil cooler being okay. Could you be losing the oil in another way while you are actually getting transmission into the coolant. I admit I don't know this model very well, but in certain cars there is a possibility of transmission entering the coolant via a transmission fluid cooler. Just an idea. I guess there still needs to be a reason for the oil disappearing.
No evidence of transmission fluid in the coolant. Level on dipstick is perfect and the color of the fluid is defintely oil color.
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  #29  
Old 04-15-2009, 10:32 PM
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After following this thread, I would have to go with the Mb Doc on changing the oil cooler. Its cheaper than $4000. Would not be an easy DIY if you have to pull intake. It's really better for your personal mechanic to the work. The dealer will charge way to much . Good luck, this is a ruff one
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  #30  
Old 04-15-2009, 10:34 PM
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where do you live?

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg
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