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NON AERATED OIL
G E N E R A L D I A G N O S T I C S
#5 INJECTOR OFF
ALL INJECTORS ON
165
#5 GLOW PLUG
REMOVED
GOOD ENGINE
166
AERATED OIL
167
Cylinder Balance Test
• The cylinder balance test is now available for
the 6.0L Power Stroke.
• The cylinder balance test measures the
increase of engine RPM during each firing
cycle. It then compares the RPM of all
cylinders to determine a weak cylinder.
• Further testing should be done to verify the
weak cylinder (Relative compression,
Injector disable, actual compression, etc.).
Relative Compression Test
• The relative compression test is now
available for the 6.0L Power Stroke.
• The relative compression test measures
engine RPM during each compression
stroke while cranking the engine. It then
compares the RPM of all of the cylinders to
determine if there is a cylinder that is
weaker than the rest.
• Once a cylinder is determined to be weak a
manual compression test should be run on
that cylinder and a good cylinder to verify
results.
Oil Aeration Test
• If oil aeration is suspected, install a valve
and hose into the oil system at either the
EOT or EOP sensor.
• Note: All materials being used should be
rated above 300 psi and 300°F.
• Run the engine until the oil is at a normal
operating temperature.
• Run the engine at high idle for approximately
one minute and then return to idle.
• With engine at idle open the valve and drain
a sample of oil into a clear container and
observe for air or foam in the oil.
• Caution: Oil will be hot and under
pressure.
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