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Summary of Cylinder Compression Check Results and Corrective Action
Results
Differential pressure of 70 psi (483
kPa) or more for an engine cylinder
Differential pressure of 60 to 69 psi
(414 to 441 kPa) for an engine
cylinder
Differential pressure of less than 60
psi (413 kPa) for an engine cylinder
Difference of 5 psi (34 kPa) or less
between engine cylinders (Pressure
readings for all engine cylinders must
be nearly equal.)
Difference of 6 to 15 psi (41 to 103
kPa) between engine cylinders
Difference of more than 15 psi (104
kPa) between engine cylinders
Air escaping at spark plug spot face
Leak check at the spark plug port
seals (using a soap solution) shows
bubbling around spark plug port seal.
72-30
Page 100
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Table 2
Indication
Satisfactory
No corrective action necessary.
Wear has
Complete the Cylinder Compression
occurred
Check again after the next 100-hour
engine operating interval - record results.
Monitor the differential pressure.
Cylinder worn or
Either manually turn the crankshaft three
not in
times or start the engine and operate for 3
conformance
minutes, stop the engine, and repeat the
Cylinder Compression Check.
If the results of the second Cylinder
Compression Check are too low, listen for
airflow at the exhaust and intake ports.
Identify all of the causes and complete the
necessary corrective action.
Satisfactory
No corrective action necessary.
Repeat the Cylinder Compression Check
after the next 10 hours of engine
operation. A valve can reseat itself and
show satisfactory compression again. If
the difference remains between 6 to 15 psi
(41 to 103 kPa) after the second Cylinder
Compression Check, identify all of the
causes and complete the necessary
corrective action.
Start and operate the engine for 3 minutes,
stop the engine, and repeat the Cylinder
Compression Check.
If the differential pressure between engine
cylinders is still more than 15 psi (104
kPa), complete the necessary corrective
action for each individual cylinder.
Fluorescent
Replace the cylinder with a cylinder kit.
Penetrant
Inspection of
area shows
cracks
Complete the "Heli-Coil
®
Heli-Coil
insert
requires
procedure in this chapter.
replacement
© 2021 Avco Corporation. All Rights Reserved
Corrective Action
®
Replacement"
February 2021
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