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#1
09-02-2003, 05:04 PM
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Do oil cooler lines have a gasket?
Here's the stupid question for the day. Do oil cooler lines have a gasket, or are they some type of tricky metal-to-metal setup?
Both my 300SD's leak from the area of oil cooler line to oil cooler lock nuts. Is this where they usually fail? Is there a gasket replacement, or is the whole darn line that has to be replaced. By the way, I just ran across a 83 300SD down at Frank's Foreign Cars in Laguna Beach that has 376,000 miles on it. The interior looked great but the paint was history. 83 300SD 176K 84 300SD 222K 
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#2
09-02-2003, 05:17 PM
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No gasket. It is a flare fitting. If you torque the fitting to the correct amount the flare of the line and flare of the fitting seals the line.
Dave
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1970 220D, owned 1980-1990 1980 240D, owned 1990-1992 1982 300TD, owned 1992-1993 1986 300SDL, owned 1993-2004 1999 E300, owned 1999-2003 1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD 1988 560SL, 100,000mi, owned since 1995 1965 Mustang Fastback Mileage Unknown(My sons) 1983 240D, 176,000mi (My daughers) owned since 2004 2007 Honda Accord EX-L I4 auto, the new daily driver 1985 300D 264,000mi Son's new daily driver.(sold) 2008 Hyundai Tiberon. Daughters new car
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#3
09-02-2003, 05:20 PM
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CAREFULLLLLLLLl
Torque them PROPERLY with a wrench on the nut that is part of the oil cooler to hold it. The cooler damages very easy!!!. Its very possible that the oil cooler is cracking around that area. Not unusual either. Been There Bent That !!!!
__________________
"Know other lessons I need to learn? TELL me. Tired of learning'em the hard way". Glow Plug Wait: [i} Time of silence in homage Rudolph Diesel. Longer you own a diesel. more honor you give". [/i] Life; SNAFU Situation Normal All Fouled Up, & FUBAR: Fouled Up Beyond All Repair -Now: Snafued Jeep TJ w/OM617 2Be daily driver & building SS M1079 w/Ambo boxed /live in Adv. Truck, Diesel KLR conversion -Sold 62 UNIMOG Camper w/617 Turbo, 85 300SD
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#4
09-02-2003, 08:36 PM
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I had a brand new oil cooler line on my 84 300SD leak where your's leaked. I wrapped the flare on the hose about six times with teflon tape. There is no more leak.
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#5
09-03-2003, 10:05 AM
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I'm going to try the teflon tape thing. Anybody know what the torque specs are on the cooler line?
I pulled out the monster Crescent wrench over the weekend, but I wisely did not crank down on the nut. I merely tested it to see how tight it was. The teflon tape seems to be a good idea.
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