My 73 220D has better than 800,000 miles on the clock. Engine rebuilt once or twice since new per original owner. Don't know the extent of the rebuild(s). Maybe they fixed things in 1973. Dimitri > > Peter Frederick wrote: > >> Marshal: > >> > >> Concerning rebuilds and factory engines on the > W115 -- MB had quite a > >> few problems with pre-mature wear on that engine, > and factory originals > >> are prone to excessive cylinder wear. A > miss-match between piston, > >> sleeve, and ring types will also do the same > thing on rebuilds. > >> > >> My friend remembers them being replaced a lot > under warranty (or > >> rebuilt with high nickel sleeves and different > pistons) -- and today > >> one with 150,000 original miles may be a smoker. > Terrible head > >> cracking problems during the 60's as well, during > which time his father > >> stopped using MB diesels in his taxi business. > MB was eventually > >> forced to give extended warranties on heads by > the German government. > >> Something about taking the head design away from > the actual producer > >> because it was cheaper, then changing it, > somewhat less than > >> successfully. > >> > >> I agree that rebuilds done in the US can be > horrible -- if not done to > >> MB tolerances, you can end up with one burning a > quart of oil in 200 > >> miles within 10,000 miles of rebuild! Some are > so sloppy the rings > >> never seat -- my brother and I got one like that > to replace his 617 > >> with a broken crank (again, a crappy rebuild -- > orange silicone slopped > >> all over the oil filter housing gasket, a big > slug sat on the #2 main > >> oil hole --- you can guess the result). That > replacement engine had a > >> ring ridge almost 0.015" deep! Bore was 0.005" > larger than the piston, > >> pistons had extruded ring lands, crank was ground > to the nearest SAE > >> dimension SMALLER than the minimum metric size > allowed, was only smooth > >> and shiny where ti ran on the bearings, valve > were way beyond terminal > >> wear, and the valve guides were all 0.005" or > more oversize. I don't > >> think it ran long, I'm quite surprised it ever > started. I don't > >> remember what the bearing clearance was on the > crank when we got the > >> engine, but I think it was 0.005" or more. > >> > >> We rebuilt it properly (after much discussion > about valve guide > >> clearance at the machine shop), and it's been > running for six years now > >> -- starts instantly no matter how cold it gets, > very little black smoke > >> and never uses oil between changes. Has 45 lbs > oil pressure at idle > >> hot unless you just pulled off the interstate! > >> > >> Peter > > > > I remember that the '68 and 69 615 engines were > flawed. I thought that > > by 1970 they had worked out the problems (but i > never owned a 515 - I > > owned a pair of 616s). > > > > Marshall > > > > -- > > Marshall Booth Ph.D. > > Ass't Prof. (ret.) > > Univ of Pittsburgh School of Medicine > > [EMAIL PROTECTED] > > > > _______________________________________ > > http://www.okiebenz.com > > For new parts see official list sponsor: > http://www.buymbparts.com/ > > For used parts email [EMAIL PROTECTED] > > > > To Unsubscribe or change delivery options go to: > > > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > > > > _______________________________________ > http://www.okiebenz.com > For new parts see official list sponsor: > http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >
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