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 Post subject: Oil leak
PostPosted: Sun Nov 25, 2018 9:38 pm 
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Joined: Sun Nov 25, 2018 9:28 pm
Posts: 3
I have a 77 400 that blows the oil filter seal out after running 30 seconds or so. Can someone help me out, thanks!!


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 Post subject: Re: Oil leak
PostPosted: Mon Nov 26, 2018 5:50 am 
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Joined: Mon Oct 29, 2012 9:05 am
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Check for two seals between the filter and the block. Sometimes when you pull filters off, the seal stays on the block.

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 Post subject: Re: Oil leak
PostPosted: Mon Nov 26, 2018 8:55 am 
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No stuck gasket, ran for a few startups, then sprayed oil and rubber gasket out front side of filter. Had a lot of ford engines. never had this problem


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 Post subject: Re: Oil leak
PostPosted: Mon Nov 26, 2018 9:09 am 
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Joined: Tue Nov 06, 2012 10:23 am
Posts: 946
Location: Texas
Are you able to see what your oil pressure is?


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 Post subject: Re: Oil leak
PostPosted: Mon Nov 26, 2018 9:26 am 
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As long as your using a good filter and getting it tight, the only other option would be a damaged surface where the seal seats. I would think that would be easy enough to see after filter removal. I guess you could have cross threaded it somehow which would make the filter not seal correctly, but I've never seen that happen.


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 Post subject: Re: Oil leak
PostPosted: Mon Nov 26, 2018 10:25 am 
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nova467spanker wrote:
Are you able to see what your oil pressure is?


Yes absolutely check and see what the oil pressure is going to when the engine starts. I saw that happen one time on a 351C and that guy's pressure gauge was going way over 100psi. All that was wrong was a tiny piece of stuff caught in the relief valve. Two gaskets as Brent mentioned is also common.

Another time on a big Ford I did see a problem where somebody didn't screw the fitting all the way down into the block and the center of the filter would bottom out and not get a good grip on the sealing ring.


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 Post subject: Re: Oil leak
PostPosted: Mon Nov 26, 2018 11:05 am 
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Joined: Sun Nov 25, 2018 9:28 pm
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The filter is seating fine. Im thinking the relief valve, 5-10 seconds after you start it, it builds up pressure and blows rubber seal out. The relief valve is on oil pump I’m assuming? I’ll drop pan and check out or is pump malfunctioning?


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 Post subject: Re: Oil leak
PostPosted: Mon Nov 26, 2018 11:06 am 
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Joined: Mon Oct 29, 2012 9:05 am
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Do you have an oil pressure gauge?

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 Post subject: Re: Oil leak
PostPosted: Sun Dec 02, 2018 10:03 am 
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Location: Omaha, NE
Likely stuck relief, once you get an oil pressure number, you can decide what you want to do.

If it's marginal, high pressure pump with tight clearances, you could drop back on oil weight and see if things loosen up, but more likely you will need to drop the pump and see what is going on with the relief (or just replace the pump)

I had a 390 in my pickup that did that 30 years ago, ran a HP/HV pump and 20w50, more is better back then. Went to 10w30 and it put oil pressure where I wanted, that motor would still be running now if I didn't stroke it, and it was beautiful inside. However, you need to know your relief is working and why pressure is so high before you make the decision

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