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GM 6.2 diesel advice please.

F

Fritz Maurer

Well-known Member
Son is in Cali trying to buy 1984 suburban with a
6.2 that had been sitting 10 years. They got it
running, and it suddenly emptied the lube oil into
the radiator. My question: is there any kind of
pressure regulating valve , cooler bypass or
whatever, that could have gotten stuck from sitting
that long? What should they check before installing
a new radiator, so as not to rupture the new cooler
as well? Thanks, Fritz
 

I take it the engine oil cooler is inside the rad?
The cooler may be what failed.
They do fail sometimes, I have a hydrostatic tractor and the hydro is cooled by an cooler in the bottom tank of rad. It is leaking hydro oil into the rad water. But not severely.

If it were mine, before buying new rad I would disconnect the oil cooler lines and connect the ends together. But I would also try to put a mechanical oil psi gauge in between to check the oil pressure going to the cooler. That way you know if your getting excessive oil psi to the cooler.
 
The coolers inside radiators can handle quite a bit of pressure, I worked on a vehicle that had a faulty Allison transmission that was dumping 225 PSI through the cooler in the rad and the cooler held up to it.

I had a 6.2 years ago that was dumping it's oil into the cooling system, that one had an internal crack in the block.

Process of elimination would be to pressure test the oil cooler in the existing radiator to confirm it is in fact faulty.
 
Unless you are a mechanic who has worked on those old diesels and are getting the truck really, really cheap I would be looking for something else.
 
If the seller is lucky the oil cooler on the radiator split and the coolant and oil are sharing space. If the owner is unlucky the is a crack in the block or a bad head gasket and the oil is pumping into the water jacket at the block - not the radiator.
 
(quoted from post at 06:17:20 07/27/22) Son is in Cali trying to buy 1984 suburban with a
6.2 that had been sitting 10 years. They got it
running, and it suddenly emptied the lube oil into
the radiator. My question: is there any kind of
pressure regulating valve , cooler bypass or
whatever, that could have gotten stuck from sitting
that long? What should they check before installing
a new radiator, so as not to rupture the new cooler
as well? Thanks, Fritz
Click to expand...

Those motors were notorious for head issues. It's hard to make a gas motor into a diesel without any effort.
 
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