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Ford Tractors Discussion Forum
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Ford 641 sending unit lock ring

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ag4ever

07-16-2013 11:12:05




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Does anybody know where I can get a new lock ring for the fuel tank sending unit on a '59 641?

I have looked at many automotive applications and nobody seems to make one the correct size.

The sending unit is a fairly common size, but the lock ring seems to be an odd size.

Or am I missing something?

The one that was on the fuel tank was all rusted up, and when I sand blasted it, it ended up too thin to work properly. I guess the mice using the space between the hood and fuel tank as a home and the sending unit as their bathroom really took a toll on that area of the tank.

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ag4ever

07-19-2013 13:21:50




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 Re: Ford 641 sending unit lock ring in reply to ag4ever, 07-16-2013 11:12:05  
I spent some time last night looking at the autometer sending unit, and it came apart completely. I will be able to cut a new sheetmetal disk the size of the stock sending unit, and bolt the in-tank parts to that disk eliminating the need to modify the tank. I think that will be the easiest way. I might even be able to cut notches in the perimeter of the autometer mounting flange to allow it to drop in the tank and use it as the locking ring eliminating two of my problems.

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cbrown9064

07-19-2013 05:15:09




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 Re: Ford 641 sending unit lock ring in reply to ag4ever, 07-16-2013 11:12:05  
I did a bit of research on sender ohms yesterday, and the ones that listed ohms where something like 14-120.
I did see that Stewart Warner made the more expensive replacement unit that is found here and other sites. Perhaps a call to YT or Stewart Warner would get you the ohm values for that unit...



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ag4ever

07-18-2013 14:35:48




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 Re: Ford 641 sending unit lock ring in reply to ag4ever, 07-16-2013 11:12:05  
Quoting Removed, click Modern View to see

I am sure I could, if the empty and full ohm readings from the stock gauge match those of the autometer gauge. Or if I wanted to use a stock gauge.

I have bought these gauges (Oil pressure, fuel level and engine temp:

third party image

Sorry for the huge image.

And the autometer fuel gauge requires a 33 ohm full and 240 ohm empty signal. Most ford automotive sending units are 8 ohms full and 70 ohms empty. Thus a stock ford automotive sending unit won't work. I am not sure what the stock tractor sending unit specs are since the one that was on the tractor was ruined from sitting in the barn for 10+ years with mice using the sending unit as their personal outhouse.

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awhtx

07-16-2013 12:58:43




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 Re: Ford 641 sending unit lock ring in reply to ag4ever, 07-16-2013 11:12:05  
I'm sure I can find a good used one around here if you can't locate one.



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ag4ever

07-16-2013 20:18:08




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 Re: Ford 641 sending unit lock ring in reply to awhtx, 07-16-2013 12:58:43  
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Looks like I might have a bigger issue. I was planning on using autometer gauges with the autometer sending unit. When I asked for the specs on the sending unit from autometer, they gave me dimensions that should have fit the stock location. I knew the autometer sending unit was one that bolted in like most boat sending units, and I was planning on dealing with the holes in the flange one way or another, but when I pulled it out of the box today it does not fit the opening for the lock ring securing tabs.

So, now my options are:

1. abandon the autometer and go back to the stock gauges (don't want to do this since the autometer gauges are white face with the ford logo in a chrome bezel that gives it a neat custom look).

2. Remove the securing ring from the tank and weld in some studs to mount the sending unit.

3. Modify the autometer sending unit to fit the opening.

Right now I am leaning towards modifying the tank to fit the new sending unit. The tank is in good condition, but not in great condition, so if I really mess it up it is not that much of a loss.

Thanks for the offer, if I decide to modify the sending unit, and the local tractor salvage yard does not have one I might take ya up on that offer.

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cbrown9064

07-17-2013 06:53:28




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 Re: Ford 641 sending unit lock ring in reply to ag4ever, 07-16-2013 20:18:08  
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Couldn't you just get the proper sending unit like the one sold on this site, then hook to your gauge? Most senders (including the stock one) simply act like a potentiometer changing the resistance as the float goes up and down. One way (up or down...can't remember) is no resistance and the other way is lots of resistance. The basic gauge (like in a boat) just interprets the ohms into a "fuel level".
So unless your auto meter gauge is something else, the replacement stock sender should work fine.

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36 coupe

07-16-2013 11:31:22




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 Re: Ford 641 sending unit lock ring in reply to ag4ever, 07-16-2013 11:12:05  
600 series didnt have a fuel gauge.



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Ultradog MN

07-16-2013 12:09:31




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 Re: Ford 641 sending unit lock ring in reply to 36 coupe, 07-16-2013 11:31:22  
But the 601 did.



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36 coupe

07-17-2013 01:16:34




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 Re: Ford 641 sending unit lock ring in reply to Ultradog MN, 07-16-2013 12:09:31  
Hes got the model and year mixed up.601 has a different grill than a 640.Makes it hard to buy parts if you dont know what year and model you have.From the troubles he has with that gas gauge I like my paint stick better.I have a 601 owners manual.Mild ep lube is specified for transmission. hydraulic and rear end.No mention of 134 oil.



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RickB

07-17-2013 02:48:13




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 Re: Ford 641 sending unit lock ring in reply to 36 coupe, 07-17-2013 01:16:34  
You are the one mixed up this time. Both 601 series and the 641 model could be equipped with a gas gauge, and were built in 1959 and the surrounding years. All 600 and 601 series tractors used the same grille as well as the NAA.



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36 coupe

07-18-2013 04:11:30




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 Re: Ford 641 sending unit lock ring in reply to RickB, 07-17-2013 02:48:13  
I have a 601 owners Manual.The tractor has a different grill than my my 640.Serial # makes it a 1954.Ammeter was taken out to put in a gas gauge in the 601.^01 manual has 1961 copy right date.



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Sean in PA

07-18-2013 07:25:57




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 Re: Ford 641 sending unit lock ring in reply to 36 coupe, 07-18-2013 04:11:30  
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I don't think that they ever made an owner's manual for just the 601 series. It should be for the 601 and 801 series, and the 801's did indeed have a different grill, so the picture you're looking at is most likely an 801.



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