The Ford Barn

pistonbroke · 08-01-2025, 08:47 AM

Hey all. On my 53 255 the oil sending unit was on the side of the filter. But on the 8ba it was down on the back of the block. When we first fired the new 255 I had it on the block which worker as it should but leaked do to a crack in the unit. It was a pain to remove it but we did and we put the pipe plug back in that port and put the sender back in the brass TEE on the side of the filter as mercury did. Now the needle never stops moving between 5 to 50. Yes , I stuck a mechanical gauge in and its a steady 65 lbs at speed and 25lbs at idle. Would the sender location make this radical movement happen? Thanks, Tim

Kube · 08-01-2025, 09:19 AM

First, Mercury and Ford had installed the sending units in the exact same position respective of year.
Second, your relocation shouldn't make much difference if you have a restrictor fitting (.060") installed and the air is purged from the line.
Third, are you 100% certain the sending unit is not defective?

Kens 36 · 08-01-2025, 10:31 AM

Quote:

Originally Posted by Kube

First, Mercury and Ford had installed the sending units in the exact same position respective of year.

Mike, with all respect you probably don't work much on "modern" cars. Mercury moved the oil sending unit up behind the oil filter starting in 1949.

Ken

Kube · 08-01-2025, 12:06 PM

Quote:

Originally Posted by Kens 36

Mike, with all respect you probably don't work much on "modern" cars. Mercury moved the oil sending unit up behind the oil filter starting in 1949.

Ken

Ford did as well. Didn't they?

big job · 08-01-2025, 01:40 PM

Quote:

Originally Posted by Kube

Ford did as well. Didn't they?

I know they are on the filter on 337s looks like his sender has a weak
ground >no sealer or tape on threads.........

Kens 36 · 08-01-2025, 01:55 PM

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Mike,

Ford moved the oil pressure sending unit to the tee on the top of the oil filter starting in 1952.

Ken

Kube · 08-01-2025, 02:01 PM

Quote:

Originally Posted by Kens 36

Mike,

Ford moved the oil pressure sending unit to the tee on the top of the oil filter starting in 1952.

Ken

So for my learning, Mercury moved them in '49 and Ford not until 1952?

Kens 36 · 08-01-2025, 02:12 PM

Mike,

A correction to my previous comment. Ford actually moved the sending unit in 1951, not 1952. I sure wish Ford had done so at least one year earlier.

Ken

Kube · 08-01-2025, 03:00 PM

Quote:

Originally Posted by Kens 36

Mike,

A correction to my previous comment. Ford actually moved the sending unit in 1951, not 1952. I sure wish Ford had done so at least one year earlier.

Ken

Well, thanks for teaching me something new.
I can't understand why the location was different for Ford / Mercury.

pistonbroke · 08-02-2025, 06:39 AM

OK, so I may have a bad sender. No there is no sealer of any kind on the theads and yes I have the factory restrictor. Dennis Carpenter has them but their made in China and buying used ones seems to be a pig and a poke as thats where the two I have came from. As for the locationon my 41 pickuo it would have been down on the block an on my 53 merc motor it was on the restrictor fitting. Thanks for the info. Tim

08-01-2025, 08:47 AM	#1
pistonbroke Senior Member Join Date: Feb 2021 Location: Perry Mo. Posts: 714	Oil pressure sending unit location in a 41 pickup Hey all. On my 53 255 the oil sending unit was on the side of the filter. But on the 8ba it was down on the back of the block. When we first fired the new 255 I had it on the block which worker as it should but leaked do to a crack in the unit. It was a pain to remove it but we did and we put the pipe plug back in that port and put the sender back in the brass TEE on the side of the filter as mercury did. Now the needle never stops moving between 5 to 50. Yes , I stuck a mechanical gauge in and its a steady 65 lbs at speed and 25lbs at idle. Would the sender location make this radical movement happen? Thanks, Tim

08-01-2025, 09:19 AM	#2
Kube Senior Member Join Date: May 2010 Location: Wisconsin, USA Posts: 9,853	Re: Oil pressure sending unit location in a 41 pickup First, Mercury and Ford had installed the sending units in the exact same position respective of year. Second, your relocation shouldn't make much difference if you have a restrictor fitting (.060") installed and the air is purged from the line. Third, are you 100% certain the sending unit is not defective? __________________ "I can explain it for you. However, I can't understand it for you".

08-01-2025, 01:55 PM	#6
Kens 36 Senior Member Join Date: May 2010 Location: Northern Illinois Posts: 501	Re: Oil pressure sending unit location in a 41 pickup Sponsored Links (Register now to hide all advertisements) Mike, Ford moved the oil pressure sending unit to the tee on the top of the oil filter starting in 1952. Ken __________________ https://www.nirgv8.org

08-01-2025, 02:12 PM	#8
Kens 36 Senior Member Join Date: May 2010 Location: Northern Illinois Posts: 501	Re: Oil pressure sending unit location in a 41 pickup Mike, A correction to my previous comment. Ford actually moved the sending unit in 1951, not 1952. I sure wish Ford had done so at least one year earlier. Ken __________________ https://www.nirgv8.org

08-02-2025, 06:39 AM	#10
pistonbroke Senior Member Join Date: Feb 2021 Location: Perry Mo. Posts: 714	Re: Oil pressure sending unit location in a 41 pickup OK, so I may have a bad sender. No there is no sealer of any kind on the theads and yes I have the factory restrictor. Dennis Carpenter has them but their made in China and buying used ones seems to be a pig and a poke as thats where the two I have came from. As for the locationon my 41 pickuo it would have been down on the block an on my 53 merc motor it was on the restrictor fitting. Thanks for the info. Tim