Re: Mariner/Yamaha help

[Don]

OK, that makes sense, simply removing the worm drive then reinstalling the pump. This keeps all the oil lines intact eliminating the need to cap off the oiling nipples in the block. I would agree with Bill, probably not the best idea to disable this system, especially if users/fuelers might get confused assuming it is oil injected.
Does this engine have an engine mounted oil tank? If so, the unit is self contained and simple to deal with. If my memory serves me, I seem to remember the Yamahas having two oil tanks, a small one right near the oil pump, as well as a larger transfer tank mounted in the boat. Although some of them had a self contained oil tank under the engine hood, an oil fill cap coming through the engine hood would be evident if the self contained system is on your engine.
You will need to find a transfer tank if your system uses it, but more importantly a dry place in the boat to mount it. The one thing that fouls all of these oiling systems is water seeping into the remote oil tanks. So, I might agree with you about disabling the oiling system if there is no locker/dry place to mount the remote tank. A common example of this would be an open 13′ whaler, no dry place for the tank, and it is common for water to collect inside the boat.
Take some pictures of your engine, so Bill will be able to see what you have/need…