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09-12-2020, 07:35 AM | #1 |
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Oil Filter Info. Needed
Dumb Question. On the early oil filter systems, how does the oil flow out of the housing into the hose that goes to the front of the engine? The hose attaches to center tube of the housing on the bottom but, the tube is where the bolt that holds the lid on threads into. So, how does the oil go out? I have spent lots of time searching and not found the answer. Does it drain around the tube at the bottom? The housing was about 1/4 full of oil when I took the top off so, that would seem to indicate that it is not draining. I suppose the hose could be clogged up but, I want to know how it works.
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09-12-2020, 08:03 AM | #2 |
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Re: Oil Filter Info. Needed
Oil returns thru two holes on side of center tube.
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09-12-2020, 08:05 AM | #3 |
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Re: Oil Filter Info. Needed
Read the oil restriction orifice post topic . It will show you two .063 holes in the tube
a little under where the tube treads are. That is where the oil drains out. There is also a .063 restriction inlet fitting. Maybe your holes are plugged up I changed a filter this week and the little holes are visible. on 8BA Napa #1006 filter........ |
09-12-2020, 09:02 AM | #4 |
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Re: Oil Filter Info. Needed
Where the drain tube or hose connects to the block depends on the year and make of the by-pass filter. An earlier model has the return to a banjo fitting on the timing cover. (51merc here on the Barn has posted a lot of oil filter photos).
Last edited by JSeery; 09-12-2020 at 09:42 AM. |
09-12-2020, 02:12 PM | #5 |
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Re: Oil Filter Info. Needed
No such thing as a dumb question. Now you know more than you did yesterday.
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09-12-2020, 02:37 PM | #6 |
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Re: Oil Filter Info. Needed
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09-12-2020, 04:54 PM | #7 | |
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Re: Oil Filter Info. Needed
Quote:
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09-12-2020, 07:46 PM | #8 |
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Re: Oil Filter Info. Needed
They all have a restrictor on the inlet side to the filter canister. They are sometimes located at the bellhousing outlet.
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09-13-2020, 07:13 AM | #9 |
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Re: Oil Filter Info. Needed
Now I am less dumb, and know what to check. Thanks for the assistance!
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09-14-2020, 08:50 AM | #10 | |
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Re: Oil Filter Info. Needed
Quote:
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09-14-2020, 09:03 AM | #11 | |
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Re: Oil Filter Info. Needed
Quote:
If the one hole is at least .080 dia. it should be OK.
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09-14-2020, 10:25 AM | #12 |
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Re: Oil Filter Info. Needed
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09-14-2020, 12:24 PM | #13 | |
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Re: Oil Filter Info. Needed
Quote:
If so then the hole in the tube should be twice the volume (5/64"). If there is no restrictor hole anywhere on the inlet side, then the hole in the return tube appears to be acting as the restricion hole. (probably early design )
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09-14-2020, 01:04 PM | #14 |
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Re: Oil Filter Info. Needed
I will check for inlet fitting restriction.
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09-16-2020, 04:44 AM | #15 | |
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Re: Oil Filter Info. Needed
Quote:
This has me leery of using the filter now. I do not know the history of this engine. I suppose I could see how much oil pressure it has once I get it to running condition and go from there. |
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09-16-2020, 08:11 AM | #16 | |
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Re: Oil Filter Info. Needed
Quote:
The later filter design was an apparent effort to reduce the buildup of pressure within the canister.
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09-16-2020, 10:12 AM | #17 |
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Re: Oil Filter Info. Needed
I dunno, if they redesigned it because of a problem, it will still have the problem, right. Thanks for all the information. We will figure something out.
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09-16-2020, 10:29 AM | #18 | |
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Re: Oil Filter Info. Needed
Quote:
Those systems worked as intended for a number of years.
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09-16-2020, 12:03 PM | #19 |
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Re: Oil Filter Info. Needed
I have never had a leak on a stock 8BA oil filter, and I've had a few, some for over 30 years.
There must be a problem with yours. |
09-16-2020, 12:39 PM | #20 |
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Re: Oil Filter Info. Needed
It was my understanding that the by-pass filters always used the inlet side restrictor. The early models used a separate fitting that screwed into the T fitting located at the bellhousing outlet. Later it was moved up near the canister. If there was a version without this inlet restrictor that would be interesting to know.
I know from past post that a lot of people have a difficult time locating the holes in the canister drain tube. |
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