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Tractor Talk Discussion Forum

Re: Any big block Chevy experts?

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the Unforgiven

07-06-2013 11:42:05

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I'm taking a temp gun out with me in just a few miutes. Two new sending units, same result. I will admit that I have not inspected the pump, but it always seems to flow real good. I just can't see it being the pump, if you reached out with your pocketknife and cut the fan belt clear off I don't think it could build heat that fast, we are talking from 165 to 220+ faster than you could close your knife and put it back in you pocket. Top of the radiator is hot, bottom tank is cooler.

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Dick W.

07-06-2013 15:16:19

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 Re: Any big block Chevy experts? in reply to the Unforgiven, 07-06-2013 11:42:05  
The lower tank on the rad should be cooler. However if the top is 220 or more the lower will be only maybe 30 less than the top if there is proper circulation. One thing I didn't see suggested is, the water pump running the proper direction for the pump and the engine. You say the temp goes up and down really fast, that has to be poor circulation or air pockets in the system getting to the sender area. Hope you get it fixed!

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Jon Hagen

07-06-2013 14:27:36

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 Re: Any big block Chevy experts? in reply to the Unforgiven, 07-06-2013 11:42:05  
Have seen GM(Buick V8) but not BB chevy where a worn water pump seal would leak air INTO the system and airlock the heater. Changed the pump and all was well.

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