Soaked Engine - Lycoming YO-233-B2A Maintenance Manual

Because of many variables, it is impossible to be sure of the airworthiness of an engine
(3)
that has been operated with incorrect fuel - except by detailed inspection of the engine by
qualified personnel. Therefore, after the engine has been operated with incorrect fuel,
regardless of the power setting or time of operation:
(a) Do not continue flight and engine operation with incorrect fuel.
(b) Drain the aircraft fuel system until all fuel tanks are empty in accordance with the
aircraft manufacturer's installation.
(c) If the aircraft manufacturer has a procedure for cleaning and/or purging the aircraft
fuel system after the use of an incorrect fuel, follow the aircraft manufacturer's
procedure. If there is no aircraft cleaning and/or purging procedure, do service on the
aircraft fuel tanks in accordance with the aircraft manufacturer's instructions.
(d) Remove the engine in accordance with the "Engine Removal Procedure" section in
Chapter 72-00.
(e) At this point, the operator can either:
1 Send the engine to Lycoming for customized evaluation and advisory on whether
an engine repair or overhaul is necessary.
or
2 Complete the following in the field:
a
b Complete then inspection of the engine in accordance with the Direct Drive
c
d Complete the engine repair or overhaul, if necessary, in accordance with the
e
f
D. Soaked Engine
NOTICE: The composition of the substance that the engine has been exposed to can affect the
type and extent of the damage.
Disassemble and examine an engine that has been soaked in water or other liquid. Refer to the
Direct Drive Overhaul Manual.
05-50
Page 46
Disassemble and clean the engine in accordance with the Direct Drive
Overhaul Manual.
Overhaul Manual.
During inspection of engine components, carefully look for signs of
detonation such as tuliped intake valves, burnt pistons, and damage to:
crankpins, main bearings, counterweights and drive train components, and
other conditions that can cause engine failure.
Direct Drive Overhaul Manual.
Refer to the latest revision of Service Bulletin No. 240 which identifies certain
parts that must be replaced on engine reassembly.
Assemble the engine and complete the operational test in accordance with the
Direct Drive Overhaul Manual.
WHEN AN ENGINE HAS BEEN SOAKED IN WATER, MOISTURE AND
UNWANTED MATERIALS CAN CAUSE DAMAGE TO ALL SYSTEMS
OF THE ENGINE. DO NOT OPERATE AN ENGINE THAT HAS BEEN
IMMERSED. THE ENGINE MUST BE DISASSEMBLED AND
EXAMINED.
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
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February 2021