Service Manual 5008330_55 HP MFE Oiling System [Oil Control Settings]

External hoses and fittings, internal cylinder/crankcase passages, and intake manifold passages are used to recirculate any accumulation of oil from various locations in the powerhead. The movement of oil is controlled by check valves.

Cylinder Recirculation

Internal powerhead oil drain passages connect the intake port areas of the cylinders to circulate residual oil in the block.

External fittings and in-line check valves on each side of the cylinder block control the movement of oil from the lower cylinder port to the upper cylinder port.

Crankcase / Main Bearing Recirculation

The movement of oil through the main bearings is controlled by internal passages, external fittings and hoses, and check valves.

Lower to upper main bearing oil flow:

• Lower main bearing cavity to internal crankcase passage to external fitting, external hoses with in-line check valve to external fitting at upper main bearing, and into upper main bearing through internal crankcase passage.
• Internal crankcase passage to external fitting in crankcase cover at upper main bearing, hose routed to reed plate fitting. This circuit vents the upper main bearing cavity to promote oil flow.

• 1. Upper main bearing vent

Refer to the OIL RECIRCULATION DIAGRAM on p. 158.

Oil Injection Rate

EMM programming controls the rate of oil injection based on engine RPM. This rate can be adjusted for powerhead break-in. Use Evinrude Diagnostics software to access this feature.

Break-In Oiling

The EMM automatically supplies extra oil to the engine during the first two hours of operation, above 2000 RPM.

Follow these steps for outboard set-up:

• Use Evinrude Diagnostics software to make sure the break-in program has been started on a new outboard.
• Use the diagnostics software to start break-in oiling after a powerhead rebuild.

• 1. Break-in oil setting

The operator must monitor the oil tank level to confirm oil consumption. This may require several hours of operation above idle.

Oil Priming

The oiling system of the outboard must be primed:

• When the outboard is first installed.
• Whenever the oil supply to the oil lift pump is disconnected or disrupted.
• Whenever an oiling system component is removed or replaced.

Refer to Oil Supply Priming on p. 39.