d8 d342 turbo

two places to look, oil cooler and head gaskets.

I'm assuming it has an oil to water heat exchanger on it. Clean all the oil out of it and pressurize oil cooler on oil side with air and submerge the thing in water to check for bubbles.

If that checks out good, then I believe you're down to pulling the heads to replace the head gaskets. Do you see any other signs of a head gasket leaking, bubbles in the coolant, seepage along the head gasket etc?

This is one of those problems you want to pinpoint before you go throwing parts at it, cause it'll get costly quick if you're wrong.

does anybody know where the oil cooler is on a d342 engine? at least i think that is what engine it is. the cat is a d8 36a. any help would be appreciated

It should be near the engine oil filter. If you have oil in the rad it took pressure to put it there likely engine oil pressure through the cooler. Now if the rad holds pressure the process will reverse when you shut down the hot engine and there should be a bit of coolant in the engine oil. To check this draw a bit of engine oil from the drain cock. Look for antifreeze in the first bit out. If you don't see any you can do a Redneck Oil Anaylisis by heating up a steel plate and pouring a small bit on the hot spot. Watch the glob of oil, if it just smokes and doesn't bubble it doesn't likely have coolant in it. If it has coolant in it it will bubble up big time. I recomend heating a plate with a tourch as you probable don't have a still to test oi las I do.
Later Bob

What is the serial # of your machine ? Could you go into your problem in more depth?
Thanks
Bob

i can not find the serial #. the cat is 2 built into 1 according to the guy i bought it from. he says that it is a 14a framing with a 36a motor. the only numbers we can find on the block at the left hand rear is 820. there is a casting # 5h14?? not sure of the end numbers. the engine oil is oozing out the radiator cap. this unit is a standard shift so there is no trans cooler. there is no cooler beside the oil filters there is something that resembles a cooler on the left hand side near the front of the engine it bolts to the block at the water jacket and also has 2 lines going to the block which looks like oil passages. this thing is about 2 inches around and about 12 inches long.

I don't know what you have but my 36A1-up service manual shows a trans oil cooler
and also the 36A3860 to 36A4468 parts manual shows transmission oil cooler group #2M8190.
The oil cooler you describe is the engine oil cooler.
Oil coming out of the radiator cap definately puts the oil cooler leakage to the top of the list.

I would like to start by saying thank you to all who have replyed to my questioning, but bere with me there is more. My d8 is a 14a3399. It is as stated earilier 2 cats in one. The engine has a turbo and is apperently out of a 36a(serial# unknown). There is an engine oil cooler on the motor and it checked out as A.O.K after a pressure test. During an attempet to start the big engine was when we noticed oil oozing from the rad.The pup motor was running for about 15 minutes, it was when we started to roll the big engine over when we noticed the oil.Once we saw oil in a place that is not ment for oil we ceased our opperations and sought info as to why.I guess my next step is to check head gaskets. I was told to pressure up the coolant system with about 10 to 15 lbs of air and check for bubbles and air seepage. My pup motor is hurting i think running on one cylinder. I have another pup from a 13a3377 and was wondering if any one knew if they were interchangeable with a 36a or what ever it seems i have. Also have the whole cat that belongs to the 13a3377 pup. The engine is supposed to run and the trans is good but the final drives are shot! Any one looking for parts.