5.0 overheating
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5.0 overheating
I have a '90 302 that I put in my 86 f-150. The 86 originally had a 351 carb engine. I converted the 302 to a carb ( 4bbl) and it runs fine, until I get out on the road and put a few miles on it. It then overheats. I have changed the thermostat, but that didn't seem to matter.
I am running the water pump that was on the 351HO. Is it possible that the water pump rotation is wrong for the 5.0 engine? the water pump, off the 5.0 engine, had a surpentine belt and I have retained the original 351 v-belts on it.
I put a elelbrock performer manifold on it. Is it possible to get the hoses on wrong?
It seems like I can drive it short distances with no problems, but and long trip and it gets way to hot.
Any Suggestions?
I am running the water pump that was on the 351HO. Is it possible that the water pump rotation is wrong for the 5.0 engine? the water pump, off the 5.0 engine, had a surpentine belt and I have retained the original 351 v-belts on it.
I put a elelbrock performer manifold on it. Is it possible to get the hoses on wrong?
It seems like I can drive it short distances with no problems, but and long trip and it gets way to hot.
Any Suggestions?
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From: Virginia
Did the 351w waterpump bolt up to the later model 302 timing cover with no problems? I seem to remember when you changed to the old style v-belt pump, you need to change to the old style timing cover too?
I am pretty sure the 302 and the 351w pumps are the same, so there is no problem there.
Also make sure you put the v-belt fan on it. The serpentine fan is also backwards from the v-belt fan.
Also make sure the lower radiator hose has the spring inside it. A lot of these newer hoses you buy don't have the spring, and you need to pull the spring out of the old hose and re-use it. If you don't have a spring, when the engine is turning high rpms down the highway, the hose will get soft and the waterpump will suck it shut.
I am pretty sure the 302 and the 351w pumps are the same, so there is no problem there.
Also make sure you put the v-belt fan on it. The serpentine fan is also backwards from the v-belt fan.
Also make sure the lower radiator hose has the spring inside it. A lot of these newer hoses you buy don't have the spring, and you need to pull the spring out of the old hose and re-use it. If you don't have a spring, when the engine is turning high rpms down the highway, the hose will get soft and the waterpump will suck it shut.
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From: Denver Metro Area, CO
That Serpentine belt concerns me; I read on the 335-Series forums about guys converting to
a Serp belt and I *think* this is one of the things that eeds to change because of just this
issue. But, I fly through those posts and don't pay real close attention so I could be wrong.
Regardless, I think what I'd do is go to an auto parts store and ask to see two replacement
water pumps, one for each respective engine - one with a Serp belt, the other with V-belts -
and compare the impellers on 'em.
-ct
a Serp belt and I *think* this is one of the things that eeds to change because of just this
issue. But, I fly through those posts and don't pay real close attention so I could be wrong.
Regardless, I think what I'd do is go to an auto parts store and ask to see two replacement
water pumps, one for each respective engine - one with a Serp belt, the other with V-belts -
and compare the impellers on 'em.
-ct
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Joined: Jan 2001
Posts: 56,971
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From: Virginia
That Serpentine belt concerns me; I read on the 335-Series forums about guys converting to
a Serp belt and I *think* this is one of the things that eeds to change because of just this
issue. But, I fly through those posts and don't pay real close attention so I could be wrong.
Regardless, I think what I'd do is go to an auto parts store and ask to see two replacement
water pumps, one for each respective engine - one with a Serp belt, the other with V-belts -
and compare the impellers on 'em.
-ct
a Serp belt and I *think* this is one of the things that eeds to change because of just this
issue. But, I fly through those posts and don't pay real close attention so I could be wrong.
Regardless, I think what I'd do is go to an auto parts store and ask to see two replacement
water pumps, one for each respective engine - one with a Serp belt, the other with V-belts -
and compare the impellers on 'em.
-ct
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5.0 Overheating
I DID USE THE 351 FRONT COVER, DUE TO THE NEED FOR A MECHANICAL FUEL PUMP MOUNT. It seemed to fit ok. I will have to check on the spring in the hose. I have been running this truck for chores around the house and in my small town and it does fine. But, hit the road at 60 mph and it gets hot, very hot very quick. Sounds like the hose or stuck thermostat, but more so the hose ( if the pump is correct.) thanks to all.
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From: Virginia
You should be ok with the timing cover/pump issue. Just reach down and squeeze the lower hose. You should feel the spring trying to resist your hand pressure.
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5.0 Overheating
I checked the lower hose and found it did not have a sping in it. I had a hose that was off another F-150 and it fit ,plus it had a spring in it, so I put it on.
I also noticed the fan was not turning many rpm's and noticed fluid arou
nd the fan clutch, so I bought and installed a fan clutch, also readjusted the fan belt.
Just for fun, I replaced the thermostat( what fun!)
I buttoned it all up and put in some fast flush and filled with water. It took very little time for the temp guage to go to hot and the gurling and steam verifyed the temp guages readings.
The truck hasn't been ran a lot and evidently my problems have been caused from it not being ran.
I guess my next step will be to swap out the radiator - I have one with a bad tranny tube, but it should tell me if the radiator is the problem.
I also noticed the fan was not turning many rpm's and noticed fluid arou
nd the fan clutch, so I bought and installed a fan clutch, also readjusted the fan belt.Just for fun, I replaced the thermostat( what fun!)
I buttoned it all up and put in some fast flush and filled with water. It took very little time for the temp guage to go to hot and the gurling and steam verifyed the temp guages readings.
The truck hasn't been ran a lot and evidently my problems have been caused from it not being ran.
I guess my next step will be to swap out the radiator - I have one with a bad tranny tube, but it should tell me if the radiator is the problem.
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From: Virginia
If it looked like it was overheating right after you did the work, it just may be air locked. I would run it with the radiator cap off, and let it puke out and get all the air out, and then fill it with water. You will know it has settled down when water starts rushing through the top of the radiator and the top hose gets hot. Then take it for a test ride. You should be at least back to where you were before, ok around town and hot on the highway.
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5.0 overheating
I tried refilling it with water after the barfing stopped, it didn't seem to help.
I took it for a breif ride in the country and ended up walking back. I also noticed it will fill the overflo container to overfull, but will never suck it back into the system. I'm more and more sure that the original pump w/serpentine ran the opposite direction of this pump. Are you sure that the water pump running the exact opposite of the original pump, isn't causing my problems?
I just don't understand. I appreciate your attention!
I took it for a breif ride in the country and ended up walking back. I also noticed it will fill the overflo container to overfull, but will never suck it back into the system. I'm more and more sure that the original pump w/serpentine ran the opposite direction of this pump. Are you sure that the water pump running the exact opposite of the original pump, isn't causing my problems?
I just don't understand. I appreciate your attention!
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From: Virginia
The original waterpump did run the opposite way. But you put a regular pump off the 351w back on it correct? And the 351w was not a serpentine pump correct?
If you are not back to where you were before you did this recent change, then something you did has set you back even more.
And the coolant will not be sucked back into the system if there is air in the cooling system
If you are not back to where you were before you did this recent change, then something you did has set you back even more.
And the coolant will not be sucked back into the system if there is air in the cooling system
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Can you see the antifreeze come out of the cores of the radiator as you look into the throat of the radiator after your thermostat opens with the cap off giving it a little gas.How about pulling a heater core hose off and placing it into a bucket to see if there is flow?what do you guys think?
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Franklin2,
By original pump, I assume you mean the 5.0 pump. Yes, I replaced the 5.0 pump with the 5.8 waterpump and front cover. The belt runs in a counter-clockwise rotation.
Since the swap I have had cooling issues, but never this bad. It does seem to be much worse, than it was. One thing I discovered was the water pump belt was rather loose. I tightened it. If I am running the pump backwards, that would have made it worse, right.
JPETRO1051,
I really dont think I can see into this radiator. It has a rather long neck, but I can give it a try. I've been talking to lots of people about this problem and getting several different answers, but the serpentine belt ( original on the 5.0) runs the waterpump in the opposite direction , than the v-belt 5.8 pump that I have had on it since I made the swap. Is there a difference in the front cover that would make this ok? Are the blocks basically the same ( 5.8 vs 5.0) ? I apoligize for my ignorance, but I have always worked on small block Chevys and have discovered small block Fords are not as identical!
By original pump, I assume you mean the 5.0 pump. Yes, I replaced the 5.0 pump with the 5.8 waterpump and front cover. The belt runs in a counter-clockwise rotation.
Since the swap I have had cooling issues, but never this bad. It does seem to be much worse, than it was. One thing I discovered was the water pump belt was rather loose. I tightened it. If I am running the pump backwards, that would have made it worse, right.
JPETRO1051,
I really dont think I can see into this radiator. It has a rather long neck, but I can give it a try. I've been talking to lots of people about this problem and getting several different answers, but the serpentine belt ( original on the 5.0) runs the waterpump in the opposite direction , than the v-belt 5.8 pump that I have had on it since I made the swap. Is there a difference in the front cover that would make this ok? Are the blocks basically the same ( 5.8 vs 5.0) ? I apoligize for my ignorance, but I have always worked on small block Chevys and have discovered small block Fords are not as identical!