overheating

[Dave 001]

Jegs has an external oil cooler available that will work,.

Why add a second oil cooler? The original liquid to liquid oil cooler is better than any liquid to air cooler. Plus I would be concerned about the new cooler and oil lines being too small (restrictive) unless they are of a rather healthy size.

Why did you have to replace the radiator?

Was the cooling system ever neglected? If it was neglected, perhaps the smaller coolant holes in the head gasket are plugged with sediment. I would flush the cooling system with a good flush (Fleetguard Restore Plus). If that helps (and you don't already have one) add a coolant filter. They do a remarkable jod of keeping the cooling system clean. I put coolant filters on my last two trucks....even the gassers.

Was the engine ever loaded up with Stop Leak?

Dave

 

[Wyreth]

You mentioned locking up the clutch. Is your fan still aligned correctly front to back? I went through a similar issue with my old 65 mustang, and it turned out to be too big a fan spacer. It put the fan too close, and it couldn't draw properly. IIRC the fan should stand off the rad by 1" or so.

Also, where did you get your Aluminum rad? Is it one or two row? Does it have a high enough fin count? Defiantly do the temp tests, upper vs lower.

 

[Ataylor]

After reading, I was wondering about the radiator also. What type of radiator is it?

Archie

 

[cburrell001]

The original radiator was too far gone to be repaired. 300.00 for a the biggest aluminum one I could find, brand unknown. As for the fan, nothing changed in location.I cut the front half off the clutch and ran longer bolts thru the center disc. The engine was purchased as a short block, My old heads were reworked at a reputable machine shop. As for a second oil cooler, I'm not eliminating the original one and the one from Jegs will be a completely seperate unit. IF the addition of a larger transmission cooler and the oil cooler make a difference in cooling I am going to put my fan clutch back on. Mileage with the fixed fan went from 14 to 12 1/2. Quite a drag at 3.65 or so a gallon.

 

[junk]

Following this with interest. My 93 is running hot. boiled it on Sunday pulling around 6k lbs in 100 degree heat. When I've been measuring my radiator tank temps top to bottom they seem to match well. My a/c condensor has some bent over fins so I'm hoping it's just those fins that need straigthened. I'm also going to do a thermostat.

Seems like you shouldn't need the external tranny cooler and oil cooler to help keep water temps under control. Now cooler transmission and engine oil are always good. I myself was also wondering about fuel system timing or what about bad injectors that leak? Would fuel issues affect water temps?

Good luck and keep us posted on how to come out.

 

[firehawk]

I bet your radiator is too small. I replaced mine this summer, and everyone including radiator shops wanted to sell me something smaller than stock row count or a cheap aluminum rad. Sorry, I am not going to take people's word when they just want a sale and can only tell me it fits. For DD use, they MIGHT be fine, but my truck lives hitched to a trailer. Aluminum is fine if it is designed properly, but my solution was to have a shop order a new core exactly the same as stock and mount the tanks to it. Problem solved and was about $500.

 

[Wyreth]

The original radiator was too far gone to be repaired. 300.00 for a the biggest aluminum one I could find, brand unknown.

What are its dementions? Is it actually the diesel application rad? Or just an oversized 460 rad? How many rows is it? If its only got one row, its not going to hold up to a heavy workout.


Stepping back from the radiator for a sec. Go out, get it good and hot. Then pull over and let it idle. Even if the rad is insufficient, it should still dump heat fast (within a min or so) with that fan locked up. If it doesnt, then you likely have a problem on the pump/block side of things.

 

[cburrell001]

The radiator is as big as the original, it's about 3 1/2" thick, and there is no side, top, or bottom clearance. It mounts in the original holes and matches the shroud. My next step is to get the transmission on a seperate cooler. Thats the project for the weekend.

 

[SparkandFire]

I would be a little hesitant to totally remove the lower radiator cooling connections from the loop. If your tranny is generating enough heat to cause your coolant temp to spike, you are going to need a massive external cooler... The water to oil heat exchanger in the radiator is much more efficient than the external air to oil ones.

 

[cburrell001]

a friend of mine races dirt track and he gave me a large one he uses in his cars. He said he never runs his trans thru the radiator. I,m going to try it, but also keep a close eye on things.

 

[icanfixall]

Radiaters must have sufficent "contact" with the air passing thru them to work properly. That being said. this is the key to proper cooling. Each row fin count is the most important facter. a tube fin count of 15 or 16 fins per inch will get the job done. a 12, 13 or 14 fins per inch od the tube count will nor cool even a new radiator enough. Be it aluminum or brass. You need 51 or 16 fins per inch. I(nvestigation is what you need to do before you buy any radiator. Band aiding the cooling system will not "fix" any cooling problem. The only thremostat that has been proven to work time and time again is the factory part number E5TZ-8575-C. This is the Motorcraft factory part in the factory box. Anythng else is crap "TRYING" to do a better job than the proven factory design. Read back what happened to Alienturtles chianese thremostst failure.

 

[OLDBULL8]

a friend of mine races dirt track and he gave me a large one he uses in his cars. He said he never runs his trans thru the radiator. I,m going to try it, but also keep a close eye on things.

All I can say to that is, let me know when your tranny burns up and I'll give you instructions on what it takes to rebuild it, if you DIY.

Your friend evidently don't know what he's talking about. Never seen a race car pulling a load around a track, 10 laps ain't gonna get ya hot anyhow. Millions and millions of cars and trucks run tranny cooling lines thru radiators, as said, liquid to liquid is the most efficient way to cool something. But yes, an auxiliary tranny cooler is added when the vehicle is used for towing. You have a 93, find out if a factory tow package was added for a new truck.