DI's incorporate a small system that may not be well understood. If the air
compressor lubrication system is not functioning correctly, you may encounter
smoking, fresh clean oil in the PTO throttle body, clean oil spattered on the
back of the boat, and sometimes poor top speed.
The oil pump delivers the same amount of oil to the two cylinders, as the air
compressor. Naturally the air compressor does not need as much oil so it returns
the used, but still clean oil to the oil tank via air pressure that blows-by
the compressor rings. The oil tank filler neck separates the oil from the air.
The oil drops down through a one-way check valve back into the tank. The air
vents back to the PTO throttle body. If the check valve is plugged, broken,
or installed backwards, oil and air pressure is delivered to the throttle body
and injects into the intake air. This air pressure and oil can cause running
problems, smoke, fouled plugs and raw oil droplets on the back of the boat.
If you hear of these symptoms, read and understand the system using page 4-8
of the 2002 Tech Update book, (PN 219 700 170) or the shop manual, and inspect
the entire system before replacing any suspected components. The DI Sport Boat
manuals may not show this system completely. Use later model Sea-Doo manuals.