Got the oil cooler off. Nothing obvious stands out. It looks pretty good. I washed the inside out with brake cleaner and nothing came out, but... brake cleaner. I really couldn't think of an easy way to test if it's clogged. But I filled it up with oil and it took oil real slow. After I filled her up and stood upright the oil just trickled out. Not sure if that's a sign of a clogged cooler, but seems like it would cause some flow issues. The service manual says the oil cooler is bypassed until the engine warms up and then a valve in filter housing shuts and redirects to the oil cooler. Got me thinking I might just replace it. Hate throwing parts at a machine, but I sure don't want to run it this way.

 

drain it and clean off the oil and soak it in a bucket of kerosene, diesel or solvent based degreaser for a few days see what happens it will have oil and coolant galleries. might be a idea to take it to a engine reco shop and get it bathed in the hot tank to try and disolve any crud inside.

Good idea. I did order an aftermarket one. I'll check it out when I get it. I'll soak this one in solvent and see if it cleans up.

Hello
New member here
I have just purchased a D6b not running was told there was engine damage
Iam looking for information on the machine
Year, type of engine
Serial number 44a10066
Thx

Welcome ..1965 74"gauge