Lycoming YO-233-B2A Maintenance Manual page 42

Inspection Item
Engine Cylinders (Cont.)
Examine the cylinders for heat
damage i.e. burnt paint and
damaged fins.
(Identify whether the paint has
scaled or peeled from
discolored and blistered paint
appearance. Unburned metallic
surfaces appear bright or clean
with definite edges.
Examine the exhaust system
for leaks in connections
between the exhaust system
and exhaust ports of cylinder -
look for burnt paint around the
spark plug and exhaust flange
bosses or for light gray
deposits near the leaks; look
for a warped exhaust flange
(which can cause a leak).
Look for unusual discoloration
on each engine cylinder.
Examine the inter-cylinder
baffle for damage or looseness.
NOTICE: A cylinder can be discolored because of thread lubricant emission that happens
during assembly of the barrel at the factory. This condition is not harmful or
detrimental to the engine operation.
05-20
Page 22
50-Hour Inspection Checklist (Cont.)
Comments
If you find burnt paint on a
cylinder, then you must
examine it for internal
damage. For possible
causes and corrections,
refer to the "Fault
Isolation" section in
Chapter 12-30.
Exhaust leaks can cause
damage to spark plugs,
ignition cables, and the
cylinder head.
If discoloration is found,
do not allow aircraft to be
flown. Identify and correct
the cause. For possible
causes and corrections,
refer to the "Fault
Isolation" section in
Chapter 12-30.
Replace damaged or loose
inter-cylinder baffle. Refer
to the Direct Drive
Overhaul Manual.
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
Results/Notes
© 2021 Avco Corporation. All Rights Reserved
Done
February 2021