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Old 09-25-2021, 01:31 AM   #1
1948F-1Pickup
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Default Question on flathead oil canister filter housing

Addressing various engine items in preparation for when I get my flathead back from the builder.
Cleaning up the housing and pulled the brass fitting near the top on the side of the housing...... standard male pipe thread with inverted flare for the oil line at the other end...... TINY 1/16" clearance hole in this fitting. Is that correct?
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Old 09-25-2021, 03:52 AM   #2
Mart
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Default Re: Question on flathead oil canister filter housing

That is correct. It limits the amount of oil that is allowed to flow to the BYPASS filter. If too much were allowed to flow it would reduce the amount of oil available to flow to the bearings etc.
The restrictor must be installed between the engine outlet and the filter inlet. If installed on the outlet of the filter it puts more pressure into the filter and makes it more prone to leak.
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Old 09-25-2021, 04:21 AM   #3
mercman from oz
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Default Re: Question on flathead oil canister filter housing


Correct 1/16" Brass Fitting for Oil Canister Housing.
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Old 09-25-2021, 08:55 AM   #4
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Default Re: Question on flathead oil canister filter housing

Cool. Thanks for that guys.
When I replaced the bottom fitting on the housing because of a weep at the flared portion, that one was merely a "standard" item.
I was surprised at the amount of restriction in this upper fitting......
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Old 09-25-2021, 09:44 AM   #5
51 MERC-CT
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Default Re: Question on flathead oil canister filter housing

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Originally Posted by 1948F-1Pickup View Post
I was surprised at the amount of restriction in this upper fitting......
In a measured flow test at idle speed, 5 qts. of oil flowed in 11 min. thru the restriction..
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Old 09-25-2021, 10:12 AM   #6
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Default Re: Question on flathead oil canister filter housing

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They are called by-pass filters because the oil going to the filter "by-passes" the engine and is returned to the oil galley or oil pan. So, you want to limit the amount of oil by-passing the intended purpose of lubricating the engine bearings and moving parts (and also providing cooling).
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Old 09-25-2021, 05:16 PM   #7
Will D
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Default Re: Question on flathead oil canister filter housing

If the center tube in the filter canister that goes thru the middle of the filter and is connected to the return line has this 1/16th hole, is that not the essential flow restrictor? Leaving the only reason to having this fitting(as pictured above) with the restrictor hole would be to reduce cannister pressure to prevent leaks?

With a restrictor hole on the inlet to reduce the flow, wouldn't that actually increase pressure in the cannister as well?
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Old 09-25-2021, 06:51 PM   #8
51 MERC-CT
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Default Re: Question on flathead oil canister filter housing

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Originally Posted by Will D View Post
If the center tube in the filter canister that goes thru the middle of the filter and is connected to the return line has this 1/16th hole, is that not the essential flow restrictor? Leaving the only reason to having this fitting(as pictured above) with the restrictor hole would be to reduce cannister pressure to prevent leaks?

With a restrictor hole on the inlet to reduce the flow, wouldn't that actually increase pressure in the cannister as well?
Every stock Ford filter I have seen has the two holes in the center tube and perhaps some early as well as aftermarket filters did not.
Probably a design change to eliminate over pressure in the canister.
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Old 09-26-2021, 11:08 AM   #9
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Default Re: Question on flathead oil canister filter housing

I would always want this restrictor to be on the inlet side of the original type filter. These "drip-feed" units don't have that good of seals in the top plate or top-nut/bolt . . . too much pressure/volume, they tend to leak - all over your engine and garage floor! LOL
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Old 09-27-2021, 12:51 PM   #10
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Default Re: Question on flathead oil canister filter housing

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Originally Posted by 51 MERC-CT View Post
Every stock Ford filter I have seen has the two holes in the center tube and perhaps some early as well as aftermarket filters did not.
Probably a design change to eliminate over pressure in the canister.
Did a little researching and some reading, defies logic but makes sense. The small hole will reduce flow and pressure in the canister when installed on inlet side, interesting.
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