I recently installed a freshly rebuilt 3.2 short stroke in my 914-6 GT project.
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In preparation for first start I turned the engine over a couple of times for 30 sec each to build oil pressure and check for leaks. I found a significant leak at the bottom of the brand-new CSF engine oil cooler that I had leak tested before installation.
I assumed the leak had to be from the large return line at the bottom of the cooler as I would not have expected to have flow through the top holes that feed the radiator portion of the cooler in a cold engine with the T-stat closed. I removed the cooler to see what the problem was and found this.
The oil tracks appear to show leakage from the top holes past the seal and down to the area where I had observed the leaks.
My first question is, why would I have flow into the cooler with a stone-cold engine with the T-stat closed? Maybe something to do with starting a fresh engine with no oil in the engine?
The second question is the seals. I have seen recommendations to use the green O-rings rather than the red O-rings that came in the gasket kit that I used for this build.
Can any of the experts here offer any suggestions? What am I missing?