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Old 10-12-2010, 11:45 PM
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Can't stop this oil leak?

I have a 1965 Plymouth Belvedere II with a 273 engine and auto transmission. I normally use 10W-40 Mobile 1 synthetic oil, with a K an N oil filter.

There is an oil leak right where the oil filter mates up with the engine.

I took the oil filter off, there is a mounting plate held on with a nut. I took the plate off and block sanded the surface flat, cleaned it up and put it back on the car. That helped a little. I purchased an oil filter that has a 1 inch nut spot welded to the bottom so I could tighten it up a little tighter than normal. I have tried lubricating the gasket on the oil filter with both grease and oil and that did not help. I have tried different brand oil filters also but that did not help.

Does anyone have the solution to this problem?

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Old 10-13-2010, 12:06 AM
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you might be over tightening the filter to begin with?????
only put it on hand tight!!!!!
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Old 10-13-2010, 12:51 AM
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make sure theres not a rotted O-ring stuck up in there. and only put it on with your hand, and dont even tighten it with all your strength just tight enough.

If tight is good, even tighter is not better.
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Old 10-13-2010, 02:16 AM
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When installing ANY oil filter, you need to lube the new seal on the oil filter with a little film of oil. Then when tightening the filter, twist until snug then twist another 1/4 turn BY HAND. The nut that is spot welded to some filters is for easier removal.
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Old 10-13-2010, 04:08 AM
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I have seen the threads that the filter screws onto bent because someone speared the filter with a pry bar to get a stuck filter off. Once that tube is bent, it won't let the filter seal straight on the mounting plate surface no matter how flat it is.
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Old 10-13-2010, 07:22 AM
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one other possability

This is all great advice. One other thing to look at is the oil pressure check valve in the oil pump if it is not working correctly the pressure will run to high at highway rpms and no filter in the world will stay sealed. Its hard to diagnose because they often don't leak at idle when you are looking for the leak. Understandably you need a mechanical oil pressure gauge to check. A warning light wont work for obvious reasons.

I'm not sure that's it but it something to consider.

good luck
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Old 10-13-2010, 07:52 AM
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dripping

i'm using a hi vol pump... cold and it runs 75psi, hot running down the road is 40 to 50psi.. no leaks !!!!!!
i think u should remove the filter bracket again and look very closely again.. u know u have a problem, u just gotta find it.
bill
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Old 10-13-2010, 08:57 AM
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Old 10-13-2010, 10:49 AM
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overtightened will definitely cause leaks, it distorts the seal. Read what the filter has printed right there on the side, some even include pictures.
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Old 10-13-2010, 01:02 PM
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Under that plate (between the plate and the block) there should be a gasket, is there?

http://www.summitracing.com/parts/DCC-5249320/
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Old 10-13-2010, 08:03 PM
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Missing gasket must be the trouble

A lot of great advise. There was no gasket between the plate and the engine block so I think that must be my problem. I ordered the one suggested from Summit. Thanks so much for that idea.

When I first had the problem it was solved by tightening the filter down but eventually that did not work.

I will install a new gasket and oil filter (hand tight)to see if that fixes the problem.

Are you supposed to use sealant on that gasket between the plate and the engine block?

Thanks for all the replies.
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Old 10-13-2010, 08:23 PM
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I've done both with and without sealant with no leaks either way. If you use sealant use it sparingly and make sure the surfaces are oil free. Shoot the surfaces with some brake clean and allow it to evaporate. Then a thin skim coat.
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