Installation manual

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90-898305

5-4

Oil System Operation

Oil in this engine is not mixed with the fuel before entering the combustion

chamber. Oil is stored inside the remote oil tank in the boat. Crankcase

pressure forces oil from the remote oil tank into the engine oil tank. The

engine oil tank feeds oil to the oil pump. The oil pump has seven oil discharge

ports. Six of the oil discharge ports inject oil into the crankcase through hoses,

one for each cylinder. The last oil discharge port discharges oil into the air

compressor for lubrication. Unused oil from the air compressor returns to the

plenum and is ingested through the crankcase.

The ECM is programmed to automatically increase the oil supply to the engine

during the initial break-in period. During the initial engine break-in period, the

oil ratio is doubled during the first 120 minutes of operation over 2500 RPM.

Oil ratio below 2500 RPM is at the normal rate. After the engine break–in

period, the oil ratio will return to normal – 300 - 400:1 at idle to maximum of

60:1 at WOT (depending upon engine load).

1998/1999 2.5L Oil System

a) Remote Oil Tank

b) Engine Oil Tank

c) Oil Supply Hose to the Oil

Pump

d) Oil Pump

e) Oil Supply Hoses to the

Cylinders

f) Oil Supply Hose to the Air

Compressor

g) Air Compressor

h) Check Valve

i) Oil Return Hose from the Air

Compressor

j) Low Oil Sender Wires (to ECM)

k) Magnetic Float

l) Air Pressure

m) Crankcase Pressure w/One

Way Check Valve

Notes

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