NOTE: If the oil pump outlet pressure is less than the spec-
ification, check for damage to the oil transfer tube, the oil
pressure regulators, and the lubricating oil pump. Refer to
Procedures 2-11 (Lubricating Oil Transfer Tube), 2-13 (Lu-
bricating Oil Pump) and 2-15 (Main Lubricating Oil Pressure
Regulator).
NOTE: If oil pump outlet pressure exceeds specifications,
change the oil filter and repeat the measurement. If the
pressure is still high, check for restrictions in the oil transfer
passage and in the oil cooler passages.
6. If either of the following conditions exist,
• at 93°C [200°F] maximum oil rifle pressure below
69 kPa [10 psi], or
• oil filter outlet pressure is within or exceeds spec-
ifications and oil rifle pressure is below specifica-
tions at high idle
Install a pressure gauge of known accuracy at the
back end of the piston cooling nozzle rifle. At high
idle, the oil pressure at the end of the piston cooling
rifle must be 240 to 310 kPa [35 to 45 psi].
NOTE: If the piston cooling rifle pressure is within or ex-
ceeds specifications and the main oil rifle pressure is below
specifications, check for restrictions in the block oil pas-
sages or for internal engine damage.
Section 2 - Lubricating System Lubricating Oil System Diagnostic Checking (2-01)
N14 Page 2-17
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