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YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
E. Engine on Fire or Near a Fire
(1) Any components exposed to the heat of a fire must be replaced.
(2) Also, disassemble and examine the engine to look for any other damage from heat. Refer
to the Direct Drive Overhaul Manual.
F. Hydraulic Lock
Hydraulic lock is caused by liquid accumulation in the Induction System or the cylinder
assembly.
(1) The liquid prevents movement of the piston during the compression stroke.
(2) Damage to the engine occurs when the other cylinders fire, which forces the piston in the
liquid filled cylinder through the compression stroke.
(3) Damage to an engine from hydraulic lock can be extensive due to the high forces. These
forces can damage connecting rods, pistons, cylinder assemblies, piston pins, the
crankcase, and the crankshaft.
(4) Hydraulic lock can occur as a result of any of the following:
— Incorrect maintenance of the cylinder fuel drain lines
— Incorrect starting procedures
— Failure to remove preservative oil from an engine that had been in storage.
(5) Examine the engine for hydraulic lock as directed below.
(a) Remove all cylinders and connecting rods in accordance with the Direct Drive
Overhaul Manual.
(b) If all connecting rods are in compliance with the specified criteria in the Overhaul
Manual, reassemble the engine in accordance with the Direct Drive Overhaul Manual.
(c) If any connecting rod is not in compliance with acceptance criteria, remove and
disassemble the engine to examine the crankcase and crankshaft in accordance with
instructions in the Direct Drive Overhaul Manual.
G. Volcanic Ash/Particulate Contamination
(1) Given the dynamic conditions of volcanic ash, Lycoming recommends that engines not
be operated in areas where volcanic ash is seen in the air or on the ground. Ash on the
ground and runways can inadvertently get into the engine compartment and cause engine
damage during landing or take-off.
(2) If you know in advance that you could have flight in volcanic or particulate-laden
environments, as a precaution, install inlet and exhaust covers to prevent airborne
volcanic ash from entry into the static engine.
(3) Inlet air which contains volcanic ash or other particulates can cause damage to piston
engines. Solid deposits can collect on engine baffles or other engine surfaces to prevent
engine cooling. Accumulation of deposits on the induction air filter can prevent air flow
to the engine and decrease engine power.
© 2021 Avco Corporation. All Rights Reserved
February 2021
DO NOT OPERATE THE ENGINE IF HYDRAULIC LOCK IS
SUSPECTED.
05-50
Page 47
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