Little cooling problem-
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Little cooling problem-
Ok.
1985 F250, fresh 466 rebuild. Cooling system is bled, no doubt about it.
Symptom- If a thermostat is installed, it overheats. This occurred last year, and my boss and co-works looked at it (I'm a auto-tech) and the conclusion was the radiator was slow flowing, probably due to sealant the old owner added. Water pump was replaced just prior to the rebuild, and multiple thermostats were tried. Take the t-stat out, runs cool but ok.
So, I'm planning to go on a ~500 mile trip, to go pick up my boat from my Uncles tomorow, so I bought a new radiator and installed it today.
It heated up pretty quick, an I'm going to test drive it now. I'm hopeing when it is moving it won't overheat.
What do you think? All I can imagine is if somehow the water pump isn't flowing enough? I just don't know? I'm going to take a drive, and if it over heats, pop the t-stat out along side the road...
1985 F250, fresh 466 rebuild. Cooling system is bled, no doubt about it.
Symptom- If a thermostat is installed, it overheats. This occurred last year, and my boss and co-works looked at it (I'm a auto-tech) and the conclusion was the radiator was slow flowing, probably due to sealant the old owner added. Water pump was replaced just prior to the rebuild, and multiple thermostats were tried. Take the t-stat out, runs cool but ok.
So, I'm planning to go on a ~500 mile trip, to go pick up my boat from my Uncles tomorow, so I bought a new radiator and installed it today.
It heated up pretty quick, an I'm going to test drive it now. I'm hopeing when it is moving it won't overheat.
What do you think? All I can imagine is if somehow the water pump isn't flowing enough? I just don't know? I'm going to take a drive, and if it over heats, pop the t-stat out along side the road...
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Joined: Feb 2008
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From: Out of here
I wouldn't want to chance it overheating and "pop the t-stat out along side the road". You could ruin your engine very easy that way, and it's a good way to get burned.
I would find the problem before you leave.
Do you have a good fan and shroud in place?
I would find the problem before you leave.
Do you have a good fan and shroud in place?
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The fan shroud is whole, and the fan blows a storm.
I suppose I'll go stick my thermometer on it and see what it says..
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From: Oklahoma
If there's any doubt about the accuracy of the stock guage, stick an aftermarket mechanical guage in it just to check. Did you do your own engine rebuild? Is it possible that you have one or both head gaskets on backwards? (with the water passage at the front of the engine instead of the back?)
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It's a little odd now..
I brought along my laser thermometer, and just kept checking it. It never actually overheated, and the funny thing is, after a bit of driving (I did about 500 miles since yesterday, drove across the state, and towed a boat back) it seems to be working ok. The gauge climbs abit when I let the truck idle, but it doesn't seem to be a problem.
I did however get pretty bad gas mileage, worse than I expected. I haven't done the math yet, but I think I got about 6mpg... I was shooting for at least 8 if not 10...
I brought along my laser thermometer, and just kept checking it. It never actually overheated, and the funny thing is, after a bit of driving (I did about 500 miles since yesterday, drove across the state, and towed a boat back) it seems to be working ok. The gauge climbs abit when I let the truck idle, but it doesn't seem to be a problem.
I did however get pretty bad gas mileage, worse than I expected. I haven't done the math yet, but I think I got about 6mpg... I was shooting for at least 8 if not 10...
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From: Virginia
I did however get pretty bad gas mileage, worse than I expected. I haven't done the math yet, but I think I got about 6mpg... I was shooting for at least 8 if not 10...
Of course your engine is a little tight since it's just been rebuilt, and needs to be broken in. After 500 miles, you should be loosened up a little bit, and I would get under the hood and re-tune the engine again. I would double check the timing, and maybe edge it up a little bit, and check the idle mxture screws on the carb again.
Get a timing light and while pointing it at the damper, and with the engine revved a little bit, plug in and then unplug the vacuum connection on the dist. The timing should jump up when you plug it in. If it doesn't, and you have vacuum on the line, then your vacuum advance unit might be bad, and would cause the gas mileage problem.
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