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Here's a photo of a mechanical water temp gauge

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awhtx

12-20-2007 15:09:23

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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"?

Water Temp Gauge

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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

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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