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Old 02-17-2020, 02:48 PM   #1
Flathead Noob
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Default Oil return line plugged?

1950 F1

Just from cranking several times in an effort to start the truck, I've got oil coming out past the seal on the oil canister lid.



Good oil pressure, I guess


Thanks for your help.
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Old 02-17-2020, 03:08 PM   #2
flatheadmurre
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Default Re: Oil return line plugged?

Is the restrictor in place on the inlet to the filter ??
Otherwise you will get a leak like that.
And the returnline to the oilpan not clogged ?
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Old 02-17-2020, 05:35 PM   #3
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Default Re: Oil return line plugged?

The oil should enter the filter through a .060 restrictor and exit the filter through two .060 holes. There should not be any pressure build up inside the filter housing (not enough to cause a leak if it is sealed properly). I would make sure the restrictor is in place.
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Old 02-17-2020, 09:22 PM   #4
Terry,OH
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Default Re: Oil return line plugged?

If this is a new installation check the return line fitting on the oil pan is open to the interior of the pan.
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Old 02-18-2020, 07:31 AM   #5
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Default Re: Oil return line plugged?

If you have the correct gasket seated in the lid, and firmly tightened I don't see how Ford oil pressure could push thru and leak even if the restrictor holes were plugged solid. Check the lid and cannister gasket surfaces. JMO
John

Last edited by oldford2; 02-18-2020 at 07:37 AM.
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Old 02-18-2020, 08:37 AM   #6
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Default Re: Oil return line plugged?

Remove cover and see how full canister is. If it is not overflowing it is draining. Check the cover gasket for contact. If all is ok reinstall and tighten sufficiently. Even though there may be 2 0.060 holes for draining they are not at 40psi so that could give you some pressure in the canister.
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Old 02-18-2020, 09:09 AM   #7
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Default Re: Oil return line plugged?

Quote:
Originally Posted by oldford2 View Post
If you have the correct gasket seated in the lid, and firmly tightened I don't see how Ford oil pressure could push thru and leak even if the restrictor holes were plugged solid. Check the lid and cannister gasket surfaces. JMO
John
I agree. You have pressure on the inlet and a gravity drain. You will pressurize the canister.
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Old 02-18-2020, 01:41 PM   #8
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Default Re: Oil return line plugged?

Well, it is not exactly gravity drain. The canister is pressurized because of the inflow of oil through the restrictor. But, the flow is being restricted. The grain holes see the same pressure in the canister, but should be capable of twice the flow out. Not sure how to calculate the canister pressure without thinking about it a bit, but if flow out can approach double the flow in there should be a lower pressure in the canister vs oil supple pressure. Regardless, there will be some pressure in there and the lid needs a good seal. Also, the filter material will restrict the flow and increase the pressure around it. If there was not a pressure differential the oil would not move through the filter. Another reason for the outlet having twice the flow as the inlet.
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Old 02-18-2020, 03:19 PM   #9
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Default Re: Oil return line plugged?

I think I may have posted this before> In our 46 there is a restrictor hole in the stand pipe and also another where the drain goes into the pan:

restrictor.jpg
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Old 02-18-2020, 06:31 PM   #10
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Default Re: Oil return line plugged?

Is this the style canister you have? You might just need a new gasket.
Make sure it is completely seated and doesn't shift during tightening.
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File Type: jpg IMG_4835b.jpg (48.7 KB, 18 views)
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Old 02-18-2020, 07:17 PM   #11
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Default Re: Oil return line plugged?

When you buy a new filter the correct gasket is included

CARQUEST # cfi 85516

Unless he is trying to use an old gasket and filter
He has not responded to folks trying to help him?

Last edited by oldford2; 02-18-2020 at 07:26 PM.
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Old 02-19-2020, 06:43 PM   #12
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Default Re: Oil return line plugged?

Sorry for not responding.
I am absorbing as much info as possible.


I can't reply to every question with an answer. I have only short chunks of time when I can go to the vehicle and try to accomplish something. Its not nearby, its outside and its winter.


I did reuse the old gasket because initially I couldn't get the filter out. The oil leaked when I got the engine to crank. 2nd attempt I got the filter out but did not replace. Cranked more and watched the oil ooze into the canister.

I reached in and felt a ton of sludge at the bottom.
Tomorrow I will clean the canister out as well as the return line and see what happens.


Thanks for your time!
I love that so much knowledge and experience is offered by all of you.


PS. The truck came with some old Atlas filters. Ok to use or should I get new filters?


Thanks!
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Old 02-19-2020, 06:54 PM   #13
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Default Re: Oil return line plugged?

if the filters are sealed and have been stored correctly there should be no problems but if in dout throw them out engines cost a lot more than a filter
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Old 02-20-2020, 06:12 AM   #14
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Default Re: Oil return line plugged?

On mine I really have to crank down the lid bolt to keep it from leaking, and I ended up putting two new gaskets on it, instead of one. There is a lot of pressure in there, even with the restriction.
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Old 02-20-2020, 08:47 AM   #15
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Default Re: Oil return line plugged?

The pressure pushes the oil through the filter. There is a pressure drop between the inlet and drain due to this. This means the drain hole sees less pressure than the inlet.
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Old 02-20-2020, 10:33 AM   #16
51 MERC-CT
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Default Re: Oil return line plugged?

Quote:
Originally Posted by Flathead Noob View Post
Sorry for not responding.
I am absorbing as much info as possible.

I reached in and felt a ton of sludge at the bottom.
Tomorrow I will clean the canister out as well as the return line and see what happens.

PS. The truck came with some old Atlas filters. Ok to use or should I get new filters?

Thanks!
Sludge on the bottom of the canister will not effect the draining.
The oil returns via (2) .063 dia. holes in the center stand tube that are located about the same level as the input fitting on the side of the canister.
Make sure the canister return line is clear as well as the (2) holes in center tube.
If the filters you have are new old stock they should be OK to use.

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Last edited by 51 MERC-CT; 02-20-2020 at 11:30 AM.
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Old 02-20-2020, 04:47 PM   #17
Flathead Noob
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Default Re: Oil return line plugged?

Thank you for posting the picture with the holes in the drain tube!


I got it apart as much as possible, cleaned out the sludge, pulled the drain line, but couldn't get anything to come out the bottom.


I stared at it and thunk hard about how oil gets out. I was dumbfounded.


Those little holes escaped my attention for a long time. Someone had mentioned them earlier, but I just couldn't figure it out.


Thanks everybody for your help!
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Old 02-20-2020, 06:19 PM   #18
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Default Re: Oil return line plugged?

Does this help any?
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File Type: jpg Oil Diagram.jpg (61.9 KB, 16 views)
File Type: jpg filtr1.jpg (45.8 KB, 17 views)
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