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Old 10-19-2019, 04:15 PM   #1
35fordtn
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Default 59A flathead oil passageway plugs question

On a flathead (59A) there is a oil passage plug at each end of the block. One of them has a shoulder of sorts on it. What is the purpose of this? Does any one make this special plug with the shoulder NEW?
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Old 10-19-2019, 04:17 PM   #2
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Default Re: 59A flathead oil passageway plugs question

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Old 10-19-2019, 04:25 PM   #3
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Default Re: 59A flathead oil passageway plugs question

Does any one make this special plug with the shoulder NEW?

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Old 10-19-2019, 11:56 PM   #4
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Default Re: 59A flathead oil passageway plugs question

Michael, your question about the front oil gally plug has been the same question I've had since I've owned and worked on these early Flathead engines....starting in the late 50's. Basically what I was told...the extended diameter on that threaded plug, was to restrict the flow of oil coming through that galley, and going into the timing gear area.
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Old 10-19-2019, 11:59 PM   #5
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Default Re: 59A flathead oil passageway plugs question

John,
Thanks! I am prepping to build a engine for my 36 and have lost the plugs, I can obviously put basic pipe plugs in, but my concern was what happens if I put a plug in without the shoulder. It seems maybe no harm will come from it?
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Old 10-20-2019, 12:22 AM   #6
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Default Re: 59A flathead oil passageway plugs question

It seems maybe no harm will come from it?
I dunno Michael....the front oil pressure relief valve has a flat on it in order that a small amount of oil can 'bleed off' to lube the timing gears. I think that works in conjunction with the other restriction provided by that protrusion on the front gallery plug. Fitting a plug without that protrusion could allow more oil to escape through the flat in relief valve....meaning less oil to bottom end?

Henry, renowned for being frugal, obviously decided that the extra material in that plug was warranted....
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Old 10-20-2019, 02:37 AM   #7
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Default Re: 59A flathead oil passageway plugs question

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John,
Thanks! I am prepping to build a engine for my 36 and have lost the plugs, I can obviously put basic pipe plugs in, but my concern was what happens if I put a plug in without the shoulder. It seems maybe no harm will come from it?
Michael, some of the engine building guru's who post here also say that special threaded plug is not that important, but I've always made sure the correct plug went into any FH engine I have from 35 to 48 and also any engines I've built in those same years. My theory is the same as Brian's on this plug.... Henry would not have wasted even a fraction of a cent on a part like this unless it served some purpose, and it may even serve more than one purpose. I'd suggest putting the correct plug in those engines you are building. I have a few extra if you need one, or two.
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Old 10-20-2019, 05:40 AM   #8
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Default Re: 59A flathead oil passageway plugs question

I bought those from Mac VanPelt
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Old 10-20-2019, 08:21 AM   #9
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Default Re: 59A flathead oil passageway plugs question

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I bought those from Mac VanPelt
He most likely sells used and/or NOS, I doubt any one is reproducing that plug design. However, I could make one pdq if necessary
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Old 10-20-2019, 09:08 AM   #10
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Default Re: 59A flathead oil passageway plugs question

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He most likely sells used and/or NOS, I doubt any one is reproducing that plug design. However, I could make one pdq if necessary
Yes the one on the front to machine a brass plug hardware store drilled a hole
back side and pressed a brass pin in with lock tight. Pictures and some scaling
down or up on the PC this pin cannot come out cause its under pressure. The
rear plug hardware bought brass plugs, has to be machined thinner and screw
driver slotted which is a pain. The solution; screw the new fat plug into a known female with the same TPI with locktight, chuck it up and face of both of them cause this plug is thin or the rear idler gear cover will not sit flat with a store bought plug. My problem 2hrs to find a female fitting and 10 seconds to face it LOL in the shop. Or those without access to a lathe, clamp
it in a vise and grind it to make it thinner............
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