I have a 540 N/A. My oil temp never reaches 140, thats where the guage begins, and my water temp never breaks 100. There is no thermostat and a large oil cooler. Should't these temps be higher?

had a n/a 540 and oil was around 220-230, water was 145-155.

This is an interesting topic.Granted,the oil temp needs to be above 212 degrees.However,what is the downside to the water temp being just as cold as possible @13 to 15 PSI?

Walgreen,do you have a piston tolerance suggestion for a cold engine?

Where do you measure the oil temp, I also run a huge 2 pass cooler, in the pan I will see 220 but in the galley (after the cooler) I never saw any real temp. Now I just measure in the pan.

Walgreen,do you have a oil temp thermostat?

Can you elaberate on "bad stuff"? Because I have some bad stuff going on, rear main leaking, front seal on open timing belt leaking, and now discovered a worn bearing when checking rear main seal.

Or, do I have a bad crank?

Fresh or salt water? At 140*, salt starts crystallizing quickly.

Pure energy,
You might want to see if you have enough crankcase ventilation as well. If you don't have enough breather in the valve covers you can have the same leaks as described. As far as the bearing, which one is wearing bad? This could be a couple of things.

John