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Ford 841 temp gauge problem

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Wade Ralph

12-20-2007 11:54:59




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I just purchased a new temp gauge for my 62 Ford 841. When I removed the old sensor from the engine there was a thin metal prong and thredded bolt remaining inside the head of the engine. The new gauge has a solid brass prong that will not go in the engine with that thin temp prong and bolt still inside. Did I get the wrong temp gauge or did that bolt split inside the head? how do I get the bolt out that is inside the head.Please help!!!

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GlenIdaho

12-20-2007 13:48:31




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 Re: Ford 841 temp gauge problem in reply to Wade Ralph, 12-20-2007 11:54:59  
How did you remove the sensor? Did it have a hex head nut with the heat sensor and cable going through it? Or, does the sensor screw into the remaining "bolt and prong"? Remove the remaining "bolt and prong" and see if the new one fits.

If you can take a photo of the questionable part, it might help to ID it. I have an old sensor I'll take a photo of and will post it tonight.



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awhtx

12-20-2007 12:42:58




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 Re: Ford 841 temp gauge problem in reply to Wade Ralph, 12-20-2007 11:54:59  
The original water temp gauge is a mechanical unit with a "bulb" attached to the end of a long cable which is attached to the gauge itself. The unit cannot be disassembled. It sounds like someone has converted your tractor to an electical gauge which has a sending unit that screws into the block and a wire that runs from this sending unit to the gauge and another wire that runs from an electricity source to the gauge. Which type (mechanical or electrical) does your tractor have and which type are you trying to install?

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Wade Ralph

12-20-2007 13:14:36




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 Re: Ford 841 temp gauge problem in reply to awhtx, 12-20-2007 12:42:58  
My new gauge has a bulb that attaches to the gauge directly. No additional wires.The old unit did not work and was very rusty. there is a metal prong attached to a thredded bolt still inside the head.



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awhtx

12-20-2007 14:54:14




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 Re: Ford 841 temp gauge problem in reply to Wade Ralph, 12-20-2007 13:14:36  
Maybe that "metal prong" is the remains of the old mechanical gauge cable that someone has cut off leaving a stub sticking out. If so, all you have to do is stick a socket on the retaining nut and take it off. Then you can pull the old bulb out and install your new gauge assembly.



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awhtx

12-20-2007 15:09:23




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 Here's a photo of a mechanical water temp gauge in reply to awhtx, 12-20-2007 14:54:14  
Follow the link and look at the photo. The threaded bushing you see in the photo screws into the cylinder head. After the bushing has been installed you put the bulb in it and tighten the retaining nut. You can see the end of the bulb sticking through the bushing and the retaining nut securing it into the bushing. When you buy a new gauge the kit will include a couple of bushings with different threads on the OD. Obviously you use the bushing that matches the threaded hole in your cylinder head.
Has someone cut off the cable coming out of the bulb on your old gauge and that's what you're calling a "metal prong"?

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GlenIdaho

12-20-2007 15:39:56




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 Re: Here's a photo of a mechanical water temp gauge in reply to awhtx, 12-20-2007 15:09:23  
third party image

Hi Wade;

Here's another photo of the temp. sending unit. This one is out of an 850. From the Ford Parts Catalog it looks like the same part # was used in the 801's. Hope this helps.



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Wade Ralph

12-21-2007 06:57:36




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 Re: Here's a photo of a mechanical water temp gauge in reply to GlenIdaho, 12-20-2007 15:39:56  
My old temp gauge is the same as Glen's picture. The brass bulb(tube) has broken off inside the head. there is a thin piece of metal attached but is recessed in the block. Can this be drilled and removed? I just don't want to damage the threads.How do I remove it safely?



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Jim in NY

12-21-2007 07:50:14




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 Re: Here's a photo of a mechanical water temp gauge in reply to Wade Ralph, 12-21-2007 06:57:36  
I would not drill it out if I were you --- what I did when mine was broken off flush with the head was just to take a good pair of needle nosed pliers and pull it out while twisting slightly... if your head is like mine then there is a machined (well like ) recessed area where the bulb bottoms out on in the head and if you drill this you will damage this "stop" and not be able to use the proper temp bulb and cable ! Not all heads on these engines have a bushing before the head itself -- some temp retaining nuts are the same thread as the female portion on the head itself and thereby the temp bulb threads directly into the head "without" a bushing needed! Believe me I have been all through this.. that is to say if your head is like mine and has not been tampered or altered, or, in some cases replaced with another head of a different designed port for the temp bulb and sender ! Email me if you need -- I would be happy to assist.. JIM

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GlenIdaho

12-21-2007 07:32:30




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 Re: Here's a photo of a mechanical water temp gauge in reply to Wade Ralph, 12-21-2007 06:57:36  
Hi Wade;

Is the nut still in the head or just the bulb? If the nut is in the head and won't move you can try a little heat to get to break free. That's what I had to do with mine. If it's just the bulb you can try heat as well and try to carefully pry the lip loose so you can grab it with pliers or try an ez out. Another idea would be to drill out the bottom of the bulb, hook it with something and try to work it out. Or, as you suggest drill out the bulb, being carefull not to drift into the threads.

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