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Order Ford 640 Parts Online

Re: 640 temp sensor replacement:how do you get the new one 2 sea

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Author  [Modern View]

11-10-2012 16:17:28

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The only way you will ever get the nut tight enough to completely seat the sensing bulb is to use a flare nut wrench (tubing wrench, line wrench, whatever you call it) to tighten it. You will surely round off the corners of the nut if you use a open end wrench. I have had to remove the battery box in order to get a good grip on the nut. I have contemplated taking a 5/8" deep impact socket and cutting a slot in the side of it for the capillary tube to pass through and trying to tighten the nut with that but I've never got around to making it.

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11-10-2012 16:27:24

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 Re: 640 temp sensor replacement:how do you get the new one 2 sea in reply to awhtx, 11-10-2012 16:17:28  
wonder if an O2 sensor socket would fit?

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John in La

11-11-2012 00:29:20

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 Re: 640 temp sensor replacement:how do you get the new one 2 sea in reply to soundguy, 11-10-2012 16:27:24  
I think a O2 socket is 7/8 he needs 5/8.
Finding a injector socket in 5/8 would be a task also.

I would think a flare nut crows foot in 6 point would work.

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11-12-2012 06:07:25

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 Re: 640 temp sensor replacement:how do you get the new one 2 sea in reply to John in La, 11-11-2012 00:29:20  
yep.. yer right.

I have a 7 pc sender changer kit and was thinking it had 1 other size in it.. .. and it does.. it's a bigger size for some oil senders. it has a couple pieces that essentially look like a crows foot socket adapeter versio of a flare wrench.. so you may be on to something there. :)

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