aftermarket oil cooler

[nrthrngreaser]

so my newly acquired 85 300sd has an aftermarked oil cooler. original is gone, and the one in there looks like a hydraulic oil cooler.

to connect it to the oil lines, someone cut the ends off the lines, and then used a piece of 1/4" pipe as a nipple, with 2 hose clamps on each end, connected to hydraulic lines to the cooler I have an oil cooler in another car I can use, but don't have the $170 for a set of hoses right now.

the question is: is there any way I can make sure that the new cooler has the flow necessary for this application? the old engine threw a rod at #5, furthest from the oil pump, and I want to make sure it's not being oil starved.
the two places that worry me are the cooler and the smaller lines used to hook them up.

I can always hook it up as original and make sure the new engine runs good then replace the lines. but I'd much rather do it when the engine's out.

I'm thinking of going to the local john deere dealer and seeing what they can do for me. why not, they're 4 blocks away.

anyone know how to calculate the flow capacity of 2 different coolers?
too bad the lines from my defunct 300d won't fit.

thanks,
karl