Installation manual

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90-898305

5-18

METHOD 3 - (DDT) DIGITAL DIAGNOSTIC TERMINAL - OIL PUMP

PRIME

This method fills the oil pump, oil supply hose feeding pump, and oil hoses

going to the crankcase and air compressor.

Refer to procedure in the Technician Reference Manual provided with the

Digital Diagnostic Software Cartridge.

Conditions Requiring Priming the Oil Pump

Condition Priming Procedure

New engine Use Method 1 or 2

Rebuilt Powerhead Use Method 1 or 2

New Powerhead Use Method 1 or 2

Oil system ran out of oil Use Method 3

Oil drained from oil supply hose feeding pump Use Method 3

Oil pump removed Use Method 3

Oil injedtion hoses drained Use Method 3

HIGH OIL CONSUMPTION

There have been reports of high oil consumption on both 2.5 & 3.0 Litre

OptiMax. A high fuel to oil ratio may be normal for some light boat

applications. When the engine is run between 4000-5000 RPM, the oil to fuel

ratio can appear very rich on oil, even after the oil break-in has been

completed. The reason for this is because the fuel consumption is lower due

to the Opti-Max design, and the light boat application, but approximately the

same amount of oil is required to lubricate the engine.

Example: An older EFI engine might use 1 gallon of oil and 50 gallons of fuel,

at 5000 RPM traveling to and from an offshore fishing location, resulting in a

50:1 ratio. An OptiMax/DFI may use 1 gallon of oil and 28 gallons of fuel at

5000 RPM, to and from the same location, resulting in a 28:1 ratio. The overall

oil consumption of an OptiMax/DFI product will be about the same as (EFI &

Carb) product, if you compare oil consumption to running time and fuel to oil

ratio. Higher than normal oil consumption can still occur, if you get a complaint

of high oil consumption, use the following steps as a guide line.

• Use the DDT to confirm that the engine has completed the break-in

procedure. (120 min. 2.5L & 240 min. 3.0L).

• Confirm how the oil consumption is being measured, and that the above

light boat application does not apply.

• Confirm that the oil tank is NOT retaining pressure on shut down.

• If high oil consumption has been confirmed, it is likely that a check valve in

the oil pump is stuck open. To confirm this, remove the oil pump from the

manifold and remove the oil pump supply hose from the engine oil

reservoir. Using a lower unit pressure checker, apply about 3 psi of

pressure to the oil supply hose. If a continuous flow of oil is exiting an oil

pump, replace the pump.

Notes

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