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Old 11-18-2013, 05:31 PM
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oil filter in 1974 240D

Im in the middle of trying to change the oil in my '74 240D and yes this is a lousy job. After putting the oil filter housing back on, i started it up and oil leaked badly out of the housing. i suspect the o-ring is not on correctly. how is that supposed to seat in the housing?

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Old 11-18-2013, 08:11 PM
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Welcome to the wonderful world of 240D-ism! Yup, the first time you change the oil is an education.

You've probably got the canister slightly cocked. Best way to replace the filter is NOT to use a ratchet to pull the housing into place. Fit the filter into the shell. use a dab of grease on the o-ring to hold it into place, use a socket and exstension to start the threads, rock the housing while you tighten the housing as much as you can by hand and THEN use the ratchet to snug it up. You should be able to spin the housing until it contacts the engine filter base housing.

After you've done it once or twice you'll get the hang of it. Just go slow and don't try to force it.
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Old 11-19-2013, 08:09 PM
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Are you sure that the old O-ring has been removed?
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Old 11-20-2013, 11:48 AM
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The old o-ring did come out. I think Mike D hit the nail, the canister seemed like it was cocked. I had to be more careful seating it back in. The problem on this car is that the canister barely comes in an out, the lip on the top of the canister prevents it from coming straight out/down because it hits the oil pan on one side and part of the frame on the other. I had to cock the canister to an angle to squeeze it back into that space, and that made the o-ring go wacky. Like you said, an education. A very oily education.
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  #5  
Old 11-21-2013, 09:38 AM
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Join Date: Feb 2013
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I swear Mercedes has a policy about either putting the oil filter in a dumb location, otr having a bunch of hoses and lines run right above it

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