OIL INJECTION
Page 3C-12 90-855347R1 JANUARY 1999
Priming the Oil Pump
Priming the oil pump (filling pump and hoses) is required on new or rebuild engines and
any time maintenance is performed on the oiling system.
There are three methods for priming the oil pump:
METHOD 1 – SHIFT SWITCH ACTIVATION PRIME
This method does three things:
a. Fills the oil pump, oil supply hose feeding pump and oil hoses going to the crank-
case and air compressor.
b. Activates break-in oil ratio.
c. Initiates a new 120 minute engine break-in cycle.
Refer to priming procedure following.
METHOD 2 – (DDT) DIGITAL DIAGNOSTIC TERMINAL – RESET BREAK-IN
This method is the same as Method 1, except the run history and fault history are erased
from the ECM.
Refer to procedure in the Technician Reference Manual provided with the Digital Diagnos-
tic Software Cartridge Part. No. 91-822608-4 or -5.
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 Diagnos-
tic Software Cartridge Part. No. 91-822608-4 or -5.
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 injection hoses drained Use Method 3
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