The other night while in the middle of the mud, my trucks radiator got slashed by the mechanical fan (unbeknown to me). I heard a noise but it went away as soon as it came and all vitals were fine so I didn't think too much about it. (The temp was slightly hotter than usual but not too bad.

I went on and about ten minutes later it started pinging while I was nearly at the end of the road, I figured I needed to get to the end before I shut it off. As I got to the end of the road, I let off the gas and the motor quit. The temp wasn't too hot (220 ish). So I tried to start it back up too cool it off a little bit but it wouldn't spin over. The other guy that was following had gotten stuck on the way out. Mine wouldn't crank so I called a friend with a truck and trailer to come get us. 45 minutes later my 460 decided to crank back up, I drive back down the road, pull out the bronco and my truck starts pinging and locks up again (smoking a little too) that's when I suspected something major. I checked the oil and it was fine. Then I checked radiator and noticed it was low on coolant. I started filling it back up and all that I poured in the top when out the bottom.

I waited a while and the motor decided to turn over again and start up and drove it back out and loaded it on the trailer.

Next day I popped the hood to find the hole in the radiator. I cranked it up to pull it off the trailer and the oil pressure was fine, and it didn't seem to be smoking for the 30 seconds I ran it.

I haven't dove in yet to do a compression check or replace the radiator, but I expect a minimum of ring damage, maybe a cracked head but only time will tell.


I'm swapping to electric fans after this (though this isn't the only reason).


Have any of you 460 gurus heard of a 460 taking this kind of abuse and shaking it off? What other problems will unlikely run into after it over heated so badly? Could the rings with some thick oil possibly reseat themselves.

 

I'd say it's on in what's in it and how it was built.

My previous 460 ended up like below, and still cranked, idled, and ran up until 3800 rpms before it'd pop any. My folks over heated the **** out of it at a bog on Memorial Day, we didn't even know anything was wrong until it spit at 3800.

Thought it was a bad lifter, turned out to be much, much more. Do a good run through on it for sure. Best of luck



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George v2.0 split the #5 cylinder from the top of the deck to the mains and would still crank and idled fine.

Start with checking the oil. If it looks like chocolate milk I wouldn't bother checking anything else while the motor is in the truck.

 

10-4 I'll update as I dive in.

 

How hot did it get? 220* isn't hot enough to lock up an engine imo

There's really no telling how hot it was without any water and a mechanical gauge.

 

Gauge fluctuated. It has a mechanical gauge but with know coolant in the system it wasn't accurate. I would have stopped it sooner if the gauge showed the true block temp.

 

Finally pulled the radiator out.







And here's the fan.



I guess the blade broke while sslapping through the mud. I think I may go with electric fans next.

 

whats the verdict on the engine??

 

I'd say the engine was way hotter than 220. Prob closer to 300 to have it shut itself off.

I know I had a 302 with a bad head gasket, would drive it tell it ran out of water and shut itself off. Fill it back up after it cooled off a bit and do it again. Ran great tell we got tired of filling it back up all the time.

It's really really hard to say true temp with no water in the engine tho.

 

Agreed.

I'd bet that effer got HOT.

 

Come to think of it, that thing had to have been alot hotter than 300. I've ran my 351M at 250-260* for a hr at a time b4.

 

I put a radiator on it today, it runs fine but smoked a small amount of white smoke when I rev it up when hot. It was spitting some water out of the radiator cap in spurts when I was filling it up.

The oil is not milky, and the exhaust doesn't smell like antifreeze, I'm thinking there was probably some ring damage, or valve seal damage, and maybe head gasket or cracked head.

It doesn't seem to be smoking enough to be a head gasket, the exhaust smells rich so that could be my smoking problem.

It runs good through the rpm range and isn't knocking. And has 45 pounds of oil pressure at hot idle with 15w 40 oil.

 

Run it until it dies.


I would have the heads magnafluxed and pressure tested. I learned that the hard way. Some cracks don't leak apparently

 

All the plugs look like this. It looks like carbon fouling to me, I'm leaning towards a rich mixture being the cause. The air filter is pretty clogged which might richen the mixture to much.
Nine of the spark plugs were rusty or shiny, but they all smelled like gas.

Do y'all have any opinions on the spark plugs above? I plan on running a compression test tommorow.

 

By nine I think I meant all... Y'all didnt know I was running a 9 cylinder.