3
3.5
OIL PRESSURE TEST
1. Engine off, remove center Main Oil Gallery plug (A)
from right side of upper crankcase.
2. Insert a 1/4” NPT oil pressure gauge adaptor and oil
pressure gauge.
3. Start the engine and allow it to reach operating
temperature, monitoring gauge indication.
NOTE
Test results are based on the use of the recommended
engine oil at operating temperature, and may vary
considerably if any other oil is used or if engine is not up
to temperature.
Oil Pressure at Idle RPM (Engine Hot):
Maximum: 100 psi
Minimum: 12 PSI
Oil Pressure at 7000 RPM (Engine Hot):
Maximum: 85 psi
Minimum: 60 PSI
NOTE
Oil pressure results show the relationship between the
flow created by the oil pump and the restriction of the
engine oil passages.
4. If oil pressure is too low, this indicates either not
enough flow or not enough resistance to flow. This
could be due to using oil with lighter viscosity than
recommended. If not, there may be excessive
clearances in the pump, bearings, or a leak in the oil
delivery passages before bearing restrictions. Leaks
that could cause this are a gallery plug, regulator
stuck open, oil filter seal, or pump gasket.
5. If oil pressure is high, this indicates additional
restriction/resistance to flow. This could be from
using oil with heavier viscosity than recommended. If
not, there may be a restriction in the oil galleries.
This could be from contamination in the crankcase,
or if the engine was recently serviced, from
excessive or misplaced crankcase sealant. This
could also be due to a stuck oil pressure regulator.
ENGINE / COOLING SYSTEM
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