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#31
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Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche |
#32
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1984 300D Turbo - 4-speed manual conversion, mid-level resto 1983 300D - parts car 1979 300TD Auto - Parts car. 1985 300D Auto - Wrecked/Parts. ========================= "If you don't know where you are going, any road will get you there". Lewis Carrol |
#33
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If you are not happy with ordinary black O rings you can go to an industrial supply house and get better, hi temp O rings in green or brown rubber (I think it's silicone).
I used to replace the O rings on my VW camper's pushrod tubes. They used the regular black rings at the block end, the hi temp (green) ones at the head end. From the dealer a set cost $85, the exact same thing from an industrial supply house cost $14. You really don't need them, but the hi temp ones will remain soft longer and not need replacing so often. Might be useful if you use synthetic oil with long drain intervals. |
#34
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#35
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Synthetic Oil for a diesel?
Do you think synthetic oil is a good idea for a diesel because of the accumulation of soot? I've been using 15-40 and changing oil at least every 3,000 miles.
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#36
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From http://www.sealdynamics-oem.com/gaskets-elastomeric-materials.htm Fluorocarbon, Viton, Fluorel, or FKM Fluorocarbon combines resistance to a broader range of chemicals than any of the other elastomers. It constitutes the closest available approach to the universal O-ring elastomer. Although most fluorocarbon compounds become quite hard at temperatures below -4°F (-20°C), they do not easily fracture, so they are serviceable at much lower temperatures. Fluorocarbon compounds provide a continuous 437"F (225°C) high temperature capability. Advantages: Excellent chemical resistance Excellent heat resistance Good mechanical properties Good compression set resistance Disadvantage: Fair low temperature resistance Chloroprene, Neoprene, or CR Neoprene is a polymer of chlorobutadiene and is unusual In that it is moderately resistant to both petroleum oils and weather (ozone, sunlight, oxygen). This qualifies neoprene for O-ring service where many other elastomers would not be satisfactory. It is also used extensively for sealing refrigeration fluids. Neoprene has good compression set characteristics and a temperature range of -67"F to 284°F (-55°C to 140°C). Advantages: Moderate weather resistance Moderate 0 resistance Versatile Disadvantage: Moderate solvent and water resistance FWIW. Another reference http://www.oringsusa.com/html/fluid_compat.html says Neoprene is marginal when used with 10W40 (engine lubricating oil). I would therefore avoid using a green O-ring on a MB Filter stem.
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting! Last edited by dieseldiehard; 04-27-2005 at 07:13 PM. |
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Plenty of reading material is there for your immediate perusal. Also, when you post a query, its not only helpful but necessary that you advise what model car or type of engine you have and where you are located. For example in some engines it doesn't matter much at all what oil is used while in others, with hydraulic lifters for example, the general recommendation is to use synthetic oil. Also the type of oil best suited to your climate depends on whether you are in Siberia or Alaska or wherever its cold (ie sub zero) or in Death Valley
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting! |
#38
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I agree, I wouldn't choose a green o-ring if I just happened to find it somewhere and didn't know of what material it was made. I'd also have my doubts about a black o-ring under the same circumstances. Not all that's black is nitrile, and some of the stuff used in domestic plumbing isn't a great choice for hot motor oil, either. If I were to buy Viton seals, though, and they happened to be green, I wouldn't lose any sleep over it. Last edited by Eskimo; 04-27-2005 at 09:50 PM. Reason: corrected "loose" to "lose" (used to be able to spell) |
#39
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Personally I would rather use a silicone O-ring unless it had strength issues (its prone to tearing easily and can cold flow more than other materials) but I don't have any.
But what I should have said, that you said well, was that one should know what material an O-ring is and make a determination on whether or not to use it based on knowledge of its composition, not color. Ordering from McMaster Carr is one way to go if you meet their minimum order, buying (or receiving free from the dealer) is another (quicker) way. Educating each other and any new DIY'ers that "tune in" is what is important here. I like studying things even if I buy my part down the street or from a mail order house.
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting! |
#40
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I don't think McMaster has a minimum order, I've never hit it at least.
I now have Viton o-rings on my filter stem, thanks for the advice.
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Jeff M. Mercedes W123 DIY pages are now located here. 1983 / 1984 300D Sold 2000 CLK430 Cabriolet ~58k Sold 2005 Avalanche 4x4 ~66k |
#41
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Oil filter "O" rings, 82 240D
I appreciate the help given in discovering the existence of those oil filter O rings on my 82 240D. I went to the local Mercedes dealer to be sure to get the right size O rings without taking out the filter and going to the local auto parts store. I was pleasantly surprised when the parts man just handed me the O rings for free. When I went to remove the old ones, they truly just shattered, being so hard. In reading further threads, some people recommend Viton and other such O rings of special materials. I hope that what I got at the dealer is also very good quality.
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#42
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The O rings that came on the car lasted 15 years and they still flexed when I pulled them off. I'd stay with the OE rings. Of course I've only used dino oil, mostly Rotella T 15-40. Syn. oil might harden the rings.
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Paul 1987 300 SDL; 2000 ML; '69 MGB; '68 VW Fastback |
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