460 overheating problems

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Jun 28, 2010 | 01:09 AM

460-67-FORD

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01 POWERSTROKE

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From: Clearfield, Utah

460 overheating problems

i just did a 460 swap from a 360 in my 67 f250 and im super confused my motor will run about 160 180 but my radiator will start smoking and just shooting out the overflow super hot!!!!!!!!!!! im lost please help my thermostat is 180 i have a 13lb cap on it im lost!!!!!!!! THANKS

Jun 28, 2010 | 01:34 AM

Ace.

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From: Spokane, WA

I would start with replacing the thermostat and go from there

Jun 28, 2010 | 07:43 AM

mark a.

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I would start first with what ace said. Are you sure there is no air in it ? If the Tstat checks out then I'd get a hold of a rad psi checker, pump it up and see if it holds psi.

Jun 28, 2010 | 08:03 AM

jim collins

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From: South west Idaho

I think it's air I had the same problem on a couple of vehicals until I got the air worked out.

Jun 28, 2010 | 08:23 AM

Fordby4

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From: Colorado

Eliminate the thermostat for now and see how it runs, if it still does the same thing, you have a defective water pump or some kind of blockage in the system

Dan

Jun 28, 2010 | 09:15 AM

HIO Silver

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From: NorCal

Don't forget to open your heater valve while purging the system. Second, is the thermostat installed correctly? I've seen a few installed upside down.

Was the engine running OK before the swap?

Jun 28, 2010 | 10:40 AM

460-67-FORD

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01 POWERSTROKE

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From: Clearfield, Utah

thanks everyone i replaced thermostat and same thing its a brand new build yesterday was the first time i started it iv talked to some people and they say my 2 core radiator is to small?????????

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Jun 28, 2010 | 06:34 PM

evam350

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Joined: Mar 2005

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Try running it without the thermostat in, I agree with the other posters you definetly seem to have air trapped in the system.

Jun 28, 2010 | 06:36 PM

#10

Poison Oil Racing

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From: Montgomery, IL

Quote:

Originally Posted by 460-67-FORD

thanks everyone i replaced thermostat and same thing its a brand new build yesterday was the first time i started it iv talked to some people and they say my 2 core radiator is to small?????????

well yea. The radiator is too small, you may have air in the system as well.

go get a 4 core radiator.

Jun 28, 2010 | 06:47 PM

#11

Opossum

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From: Renton, WA

3 things, yes make sure there is no air under your thermostat, I do this by drilling a 1/8th hole in all my thermostats. Second, watch the coolant level in the radiator and rev the engine, if the pump is working usually the level will drop for a second. Third, I'm sorry to say but it really sounds like a bad/blown head gasket. The combustion pressure leaking into the coolant is flash boiling the coolant and pressurizing the system with combustion gasses which is why it is blowing out the raidiator so much and so hot. You can easily check for this with a chemical block tester, it tests for combustion gasses in the radiator, and is pretty darn cheep and easy for what it does.

Good luck, crossing my fingers.

Ohh ya, not that getting a 4 core radiator isn't a good thing or anything, you should get one anyway, but I doubt it's your problem, if it was your temp gauge(assumeing it works well) would rise.

Jun 28, 2010 | 06:52 PM

#12

YouRang

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Joined: Jun 2008

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From: Lincoln NE

good luck finding the radiator though i had to replace the radiator in my 460 last january finding the right size is a pain.

Jun 28, 2010 | 08:02 PM

#13

78ford351m

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Quote:

Originally Posted by YouRang

good luck finding the radiator though i had to replace the radiator in my 460 last january finding the right size is a pain.

How nice of you to share where you got yours?

Jun 28, 2010 | 09:39 PM

#14

Poison Oil Racing

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From: Montgomery, IL

Quote:

Third, I'm sorry to say but it really sounds like a bad/blown head gasket. The combustion pressure leaking into the coolant is flash boiling the coolant and pressurizing the system with combustion gasses which is why it is blowing out the radiator so much and so hot.

Hadn't thought about that. good catch.