Engine Oil Pump - Yamaha WaveRunner FX140 Service Manual

ENGINE OIL PUMP

Because the MR-1 engine employs a dry sump lubrication system, it is equipped with two oil pumps:
a scavenge oil pump and a feed oil pump.
The scavenge oil pump extracts oil from the engine and sends it to the oil tank.
The feed oil pump sends oil from the oil tank to the engine.
In addition, the same axle drives both oil pumps.
Cooling water circulates around the oil tank to cool the oil.
Fig. 9
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