Oil Pressure Test

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Oil Pressure Test

Inspection and Verification

Verify the customer concern.
Visually inspect for obvious signs of damage.
If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
If the concern is not visually evident, check the base oil pressure.
Remove the engine oil temperature (EOT) sensor. Refer to Section 303-14B.Install the special tool.

Tighten to 12 Nm (9 lb-ft).
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CAUTION: Use a backup wrench on the special tool when installing the oil pressure gauge or engine damage may occur.
Install a commercially available oil pressure gauge and check the base oil pressure. The minimum engine oil pressure specifications are 82.7 kPa (12 psi) at 700 rpm, 165.5 kPa (24 psi) at 1,200 rpm and 310.3 kPa (45 psi) at 1,800 rpm with the engine at operating temperature.
Remove the oil pressure gauge and special tool.
Install the EOT sensor. Refer to Section 303-14B.
If the concern is not evident, verify the symptom. GO to Symptom Chart.Symptom Chart
<TABLE cellSpacing=0 cellPadding=3 rules=groups width="90%" border=1><CAPTION>Symptom Chart</CAPTION><COLGROUP><COLGROUP><COLGROUP><TBODY><TR><TH>Condition</TH><TH>Possible Sources</TH><TH>Action</TH></TR><TBODY></TBODY><TBODY><TR vAlign=top><TD>

Low oil pressure
</TD><TD>

Inaccurate gauge reading
</TD><TD>

DIAGNOSE the instrument cluster. REFER to Section 413-01.
</TD></TR><TR vAlign=top><TD></TD><TD>

Low oil level
</TD><TD>

ADJUST the oil level.
</TD></TR><TR vAlign=top><TD></TD><TD>

Oil dilution (fuel)
</TD><TD>

INSPECT the fuel injector O-rings. REFER to Section 303-04C. REPAIR as necessary. TEST the system for normal operation.
</TD></TR><TR vAlign=top><TD></TD><TD>

Stuck open oil pressure regulator
</TD><TD>

INSTALL a new oil pressure regulator. REFER to Oil Pressure Regulator in this section. TEST the system for normal operation.
</TD></TR><TR vAlign=top><TD></TD><TD>

Scored/damaged oil pump
</TD><TD>

REMOVE the oil pump and inspect. REFER to Oil Pump in this section. REPAIR as necessary. TEST the system for normal operation.
</TD></TR><TR vAlign=top><TD></TD><TD>

Damaged or misaligned oil filter drain back valve in the oil filter housing
</TD><TD>

INSTALL a new oil filter drain back valve. TEST the system for normal operation.
</TD></TR><TR vAlign=top><TD></TD><TD>

Rear main gallery plug
</TD><TD>

REMOVE the rear engine cover and inspect the plugs. REPAIR as necessary. TEST the system for normal operation.
</TD></TR><TR vAlign=top><TD></TD><TD>

Broken or damaged piston cooling jets
</TD><TD>

REMOVE the lower oil pan. REFER to Oil Pan — Lower in this section. INSPECT the cooling jets. REPAIR as necessary. TEST the system for normal operation.
</TD></TR><TR vAlign=top><TD></TD><TD>

Front cover gasket leaks
</TD><TD>

REMOVE the engine front cover. REFER to Engine Front Cover in this section. INSPECT the gasket. REPAIR as necessary. TEST the system for normal operation.
</TD></TR><TR vAlign=top><TD></TD><TD>

Missing gallery plugs
</TD><TD>

INSPECT for missing plugs. REPAIR as necessary. TEST the system for normal operation.
</TD></TR><TR vAlign=top><TD></TD><TD>

Missing bearing shell(s)
</TD><TD>

REMOVE the crankshaft and inspect the main bearings. REPAIR as necessary. TEST the system for normal operation.
</TD></TR><TR vAlign=top><TD></TD><TD>

Restriction in the pickup tube or oil pan
</TD><TD>

REMOVE the lower oil pan. REFER to Oil Pan — Lower in this section. INSPECT the oil pan and pickup tube. REPAIR as necessary. TEST the system for normal operation.
</TD></TR></TBODY></TABLE>