Overheating

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Dec 31, 1969 | 06:00 PM

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Overheating

Mar 11, 2001 | 01:14 AM

manlikesford

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Joined: Jan 2001

Posts: 59

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From: Puyallup, WA USA

Overheating

I have a 1976 F350 w/390. I just put in a rebuilt 390 and I am getting the same problem I had with my other engine. At idle the engine temp stays cool. When I drive down the road on the freeway, temp goes up and gets real hot. Slow down and the temp comes down. It is using the same clutch fan as the old engine. I wonder if it is the fan or is my radiator blocked somewhere and not allowing enough water through. Is there a way to check my radiator with out taking it to a shop? Or checking the clutch fan? Thanks in advance for any help.

Mar 11, 2001 | 06:40 AM

jowilker

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Joined: Jun 1999

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From: Creedmoor, North Carolina

Overheating

Andy, Since your engine is doing things in reverse, I am wondering if you have a bad guage, or timing could be off. Have you shut the engine down to hear it boiling or steaming?

John
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Mar 11, 2001 | 09:47 AM

FE427TP

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Joined: Oct 1999

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From: yes

Overheating

At highway speeds a fan does more to block air than let it flow through, that's why they have clutch fans is because after a certain speed the fan isn't doing anything but robbing power from the engine. The fan isn't sucking air at 60mph by 2000 RPM. I'd agree with John and check your timing.

Mar 11, 2001 | 10:43 AM

manlikesford

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Joined: Jan 2001

Posts: 59

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From: Puyallup, WA USA

Overheating

John, It is boiling when I turn the engine off. The radiator is very hot. When I timed the engine I used the timing marks and a vacum guage. I timed it by getting the highest vacume reading I could with out the engine pinging. Should I back off the timing alittle? The truck seems to run good besides the hot reading. It did the same thing with the old engine.

Mar 11, 2001 | 11:04 AM

otto

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Joined: Dec 2000

Posts: 1,686

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From: Racine WI

Overheating

I would put the radiator and water pump as susspect items if you already didnt replace the water pump take you radiator out and stick a garden hose in the top inlet the water should pour out the outlet on the bottom as fast as you are putting it in if it squirts out the top and flows slowly out the bottom i would say your radiator is clogged, just my 2 cents

Mar 11, 2001 | 01:01 PM

Art

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Joined: Jul 1999

Posts: 472

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From: USA

Overheating

[font size="3" color="#191979"]
I agree with otto, it could be a restricted radiator. I am not sure about the water pump, but another thing to consider is the thermostat. Sometimes it's those simple things...

Art