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#16
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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
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Where exactly are we injecting this water?
Water doesn't compress...... |
#18
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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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Own: 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), 1975 240D (245,000 miles - died of body rot), 1991 350SD (176,560 miles, weakest Benz I have owned), 1999 C230 Sport (45,400 miles), 1982 240D (321,000 miles, put to sleep) |
#19
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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. |
#20
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Quote:
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... |
#21
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Quote:
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 |
#22
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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
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Quote:
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-Trevor OBK #12 1980 300SD 333,XXX miles - Totaled 1986 Mazda RX-7 212,XXX miles - impounded and auctioned off 2005 Jeep Liberty CRD Limited 33,000- SEGR, Provent, Fumoto |
#24
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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
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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. |
#26
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Quote:
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
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#27
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Quote:
Or once the engine is started would the heat compensate for the lacking compression?
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JWJ 1983 MB 300D - > 430,000 miles - Deep Blue - Bilstein Comforts - 0-60 in 24 seconds - 27MPG 1985 MB 300TD (wagon) - > 275,000 miles - Manila Beige - Thule rack - 0-60 in 18 seconds - 22 - 25MPG Biodiesel, Mobil Delvac 1, and Viton fuel lines! |
#28
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Quote:
Tom W
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#29
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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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Dionysius |
#30
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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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