The center motor's oil is overheating? Noticed the belt was very loose, it would not even turn at idle. Changed out the belt and put in a new water impeller. The oil cooler is not blocked at all. The oil level is fine. It is still overheating the oil. Anyone already have something like this happen that could maybe save me some labor dollars when the mechanic comes over to check it out? I am hoping that it is something simple. Thanks Mike

How is the oil pressure?

Around 30 psi at 4000 rpm. The other motors are running around 40 psi at the same rpm.

providing there is nothing major mechanically going on change the oil filter as when it gets clogged the oil goes through the by-pass and then does not pass by the cooler.

I did not know that. I will do that next, hopefully that is all it is. Thank you Mike

It might very well be what asg said. However, my experience with triple diesels is that the center engine will always run hotter and will generally use more oil. The center engine seems to be constantly experiencing a higher load factor.

Just had the problem that asg said. Changed filter and that fixed the problem.

Well I guess I will get a filter on Monday and try it. That would be great if a new filter would fix it.

if you know for a fact that the oil is getting to hot then disregard, but have you checked your senders and guage wires?

What temp are you running? My buddy's center motor runs the oil 10-20 hotter, but still never goes much over 220. If it was a salt water boat you may have deposits in the oil cooler that are restricting heat transfer, a good soak in CLR or muriatic acid should clear that right up.