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Diesel Oil cooler

J

JOB

Member
There is a 89 Ford 7.3 Diesel F350 Super Duty, dual wheeled truck that the seller says has a bad oil cooler. Is there such a thing as an oil cooler on this truck. I would assume engine oil cooler?????
Any thoughts?
 
Super-duty label wasn't put on 350's until '99 model year. There was a 'SUPER-DUTY' pickup made starting in 1973 that had a set back rear axle to haul heavy loads. There was another Super Duty truck in the mid/late 1980's that was a heavy duty one ton dually that later became the F-450. They used a heavy I-beam front axle and ten bolt wheels.

The 7.3 IDI engine uses a coaxial tube heat exchanger along the driver's side oil pan rail to cool engine oil with the coolant. The o-rings that seal the small steel oil tubes inside the large tube do develops leaks. New tube assemblies are available. Not fun to install but available.
 
All that said, this is not a Power Stroke, or at least by the year it shouldn't be.
I don't remember any cooler being on a straight 7.3, but it has been 15 years since I had 1 also.
 
There was another Super Duty truck in the mid/late 1980's that was a heavy duty one ton dually that later became the F-450. They used a heavy I-beam front axle and ten bolt wheels.

That is the truck that I was trying to explain. I would guess you install a new tube assembly. Or can you just replace the O-rings? How miserable is this job.

This truck is for sale about 80 miles from me. I just want it for parts, but was wanting to drive it home.
 
is engine oil in coolant? oil cooler/O-rings can do this. coolant in oil? beware cyl. wall pinholes, coolant additive not taken care of.
 
Yes the 6.9/7/3 IDI used an oil cooler. Its a long cylinder type cooler mounted on the drivers side of engine block under the exhaust manifold and about the same length as the exhaust manifold. The oil filter adapter is mounted to back end of this cooler. They can plug up or be replaced but I would bet its probably just leaking, o-rings were a bigger problem with those and they can be resealed.

edit: They can be removed but its a tight fit. Sometimes you can separate the cooler on the engine by taking off the rear cap/oil filter adapter and pulling apart. To take the whole cooler off in one piece you will need to remove the motor mount bolts at the frame on that side and raise the engine an inch or two, might also help you to remove tire and inner fender liner. The end caps are where the o-rings are and they fit on the tube. lube o-rings before installing, they fit tight too.
 
I think I see why Dr.Evil said it was not a fun
job. To replace the O-rings on both ends you would
have to remove the entire cooler. So the motor
mount bolts removal and raising the engine would be
required.
This truck has been for sale for a long time I see
why now. The truck has a box and hoist, just might
be the only thing of value on the truck.
 
I bought a 97 ford just like the one I described in the post from a warm climate. I just put in regular anti-freeze. You mentioned coolant additive. Is that something different than anti-freeze?
 
I had a 91 dully that wasn't a power stroke that had one on it if I remember right it had 2 o rings on it and I could only get one back on but didn't have any trouble with it afterwards it was a straight 7.3
 
The additive package can be added separately or be part of antifreeze formulated for use in diesel engines. It has additives to prevent corrosion and cavitation making holes in the cylinders.

Most auto parts places have the coolant conditioner and test strips to check the coolant to see if enough additives remain, as they become depleted over time.
 
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