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  #16  
Old 04-09-2008, 11:39 AM
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Ron- Give it a try and post what happens. I will do the same, probably this weekend. I am also wondering how long to run the ATF/MMM mixture. Scott
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  #17  
Old 04-09-2008, 12:23 PM
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Where exactly are we injecting this water?

Water doesn't compress......
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  #18  
Old 04-09-2008, 12:50 PM
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Reading this thread, I am not convinced you have a ring problem at all. You recovered 100 psi but are still down 150 or more psi. To me that is an indication you have another place where compression is leaking. I would invest in the leak down test.

I will note that running my old 1982 240D on Mobil Delvac 1 5W-40 synthetic did wonders for extending the life of the engine. It turned the car from a really unreliable starter from about 45*F and lower, with no starts at all below 30*F to a car that always started, all winter long in Troy, NY without any problems. So, there is likely something to gain from addressing the cleaning of the soot and other particulate out of the ring grooves.

I also second the recommendation to run it hard once you change the oil. Then change the oil frequently (I used 6k miles as the limit with the Mobil Delvac 1, but did no oil analysis to support the interval - "dino" oils are going to require more frequent oil changes) and keep running it hard. The hills in Troy, NY were part of the therapy for my 1982.

Good luck. One cylinder so far down, and the failure to really recover the compression wet is an indication of something beyond rings. But hard driving and synthetic oil are just generally good for Diesels. Jim
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1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
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1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
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  #19  
Old 04-09-2008, 02:26 PM
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To clear up my Marvel Mystery and ATF question.

The car had sat for years.

I drove the car about 10 miles everyday then let it sit overnite for about a 5 day period.

It steadily smoked less on start-up.

Then drained and refilled with Mobil 1 and she has been fine since.
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  #20  
Old 04-09-2008, 03:04 PM
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Quote:
Originally Posted by myssrhl View Post
To clear up my Marvel Mystery and ATF question.

The car had sat for years.

I drove the car about 10 miles everyday then let it sit overnite for about a 5 day period.

It steadily smoked less on start-up.

Then drained and refilled with Mobil 1 and she has been fine since.
Do you have a theory as to exactly HOW it effected that cure ?
How about the possibility that what you used swelled up the valve stem seals..?
Of course, if that is how it worked... then actually changing the valve stem seals would probably a longer lasting and proper mechanical cure...
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  #21  
Old 04-09-2008, 05:18 PM
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Quote:
Originally Posted by myssrhl View Post
To clear up my Marvel Mystery and ATF question.

The car had sat for years.

I drove the car about 10 miles everyday then let it sit overnite for about a 5 day period.

It steadily smoked less on start-up.

Then drained and refilled with Mobil 1 and she has been fine since.

Hi Dave, sorry I'm so slow on this. When did you put in the mixture of MM and ATF? After the car sat for years? Then you drove daily for how long? A week? Month? And I'm assuming you put the mixture in the oil filler, not in the fuel tank!

And Scott, I'd love to follow through and start this process this weekend, but I won't have time to get that car out of storage until June. I will follow through with this thread and post it when I do it. And I'll sure try it, because I hate the thought of swapping engines, or a teardown. Ron
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1971 220D, daily driver, new paint, 142K
1973 220D, low compression
1975 300D, back on the road! 166K
1971 220D, salvage, rear hit, engine excellent
1972 250, bad cam, but runs!
1971 230, engine stuck
1971 220D, low compression, rusty
1976 240D, salvage, engine excellent
1966 230SL, water in oil after rebuild
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  #22  
Old 04-09-2008, 09:34 PM
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Just got home from work and checked for any new info and WOW! I am amazed at the amount of response on this site. Tomorrow I'll try to find some MMM when I go into town and probably dump it in that evening. Then this weekend I'll take it out and drive it like I rented it and see what happens. By the way-I went out this morning and the car started on the first turn and it was about 40 degrees out(California cold!) Anyway I will post results when I have them. Thanks again-Scott
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  #23  
Old 04-09-2008, 11:16 PM
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Quote:
Originally Posted by Zeppo2K2 View Post
Hi Dave, sorry I'm so slow on this. When did you put in the mixture of MM and ATF? After the car sat for years? Then you drove daily for how long? A week? Month? And I'm assuming you put the mixture in the oil filler, not in the fuel tank!

And Scott, I'd love to follow through and start this process this weekend, but I won't have time to get that car out of storage until June. I will follow through with this thread and post it when I do it. And I'll sure try it, because I hate the thought of swapping engines, or a teardown. Ron
he drove it 50 miles total... over a 5 day period ... 10 miles per day and let it sit over night.
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  #24  
Old 04-27-2008, 12:42 PM
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O K- update on the 240D. I put in the 4 quarts of ATF and 4 quarts of MMO and so far have put about 30 miles on it with no improvement. At this point I'm pretty sure the engine is shot. How long should I run the mixture before I give up? The strange thing is at higher RPM it is smooth and it has more power than my 81 that runs smooth at idle. Oh well- it's still a good parts car! -Scott
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  #25  
Old 04-29-2008, 01:33 AM
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You might have a leaking valve as well. Do at least an air injection test if not a leakdown test. To remove and repair a four cylinder head should not be all that bad if required. The chances of the rings worn in one cylinder only are less of a possibility. Still a possibility though.
If a stuck ring do not expect a quick cure with the mix in the crankcase. Give it a little more time. Thirty miles is nothing. Also the amount of times the engine heats up and cools down is an important factor to free a stuck ring. Sounds like the cylinder is firing well when revs build up. Not enough time to loose the compression then perhaps? If the cylinder was staying down that car could not compete at speed even with the other car.

Last edited by barry123400; 04-29-2008 at 01:39 AM.
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  #26  
Old 04-29-2008, 07:38 AM
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Quote:
Originally Posted by Zeppo2K2 View Post
Dave, with your 4 qts MM oil, and 4 qts ATF, did you cure a compression problem? How long, or how many miles, did you run this mixture?

I have a 220D run ?miles without thermostat by PO. It has the following readings: 290 - 180 -150 - 290 on a 40K "rebuilt" engine. The engine starts hard, runs rough until warm, and puts out a lot of blue smoke for the first 5 minutes or so. Maybe I should try your suggestion before I tear it down?

Ron
Sounds like bad glow plugs. If it has had decent care yes the rings may well be stuck in a couple of cylinders.

I don't know if I am brave enough to run mm and atf for very long in a mb of mine.

A friend who used to build a lot of funny car engines says that oil squirted into the cylinder will also sometimes seal a leaky valve in a compression test.

Tom W
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  #27  
Old 04-29-2008, 08:35 AM
JWJ JWJ is offline
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Quote:
Originally Posted by 79300sdtd View Post
AFAIK the only thing that a low compression cyl will do is cause hard starts
Wouldn't the low compression cause less efficient combustion of fuel?

Or once the engine is started would the heat compensate for the lacking compression?
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  #28  
Old 04-29-2008, 10:09 AM
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Quote:
Originally Posted by JWJ View Post
Wouldn't the low compression cause less efficient combustion of fuel?

Or once the engine is started would the heat compensate for the lacking compression?
Yes and yes.

Tom W
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  #29  
Old 04-29-2008, 06:34 PM
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Lightbulb

This might seem like a crazy question but I will ask it anyway......

Ultrasound has been used effectively to break up gallstones. Could the carbon in the ring grooves also be demolished this way??
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  #30  
Old 04-30-2008, 01:06 AM
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OK I'll run it for a while longer and see what happens. nothing to lose anyway!-Scott
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