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IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
72-00 - ENGINE REMOVAL AND RETURN TO SERVICE
1. Engine Removal Prerequisites
WARNING
DURING ALL MAINTENANCE PROCEDURES AND INSPECTIONS,
ENSURE THAT THE ENGINE IGNITION SWITCH IS IN THE 'OFF'
POSITION, ALL POWER TO THE AIRCRAFT IS DISCONNECTED, AND
ALL PERSONNEL ARE CLEAR OF THE PROPELLER'S ROTATIONAL
ARC.
A. Before engine removal from the aircraft:
(1) Make sure that all electrical switches, circuit breakers, Ignition Switch, and the Fuel
Selector Valve are in the OFF position.
(2) In accordance with the aircraft manufacturer's instructions, remove all cowling, baffling
and nacelle access panels to enable engine removal.
(3) Disconnect the ground terminal of the battery.
(4) Disconnect the positive terminal of the battery.
(5) Disconnect and examine the leads and wiring for damage or frayed wiring.
(6) Remove a spark plug from each cylinder.
(7) Remove the propeller in accordance with the aircraft manufacturer's instructions and/or
propeller manufacturer's instructions.
(8) Drain oil from engine. Refer to the "Oil Change Procedure" in Chapter 12-10.
(9) Remove accessories.
(10) If the engine is to be stored, complete the engine preservation procedure before engine
removal. Refer to instructions in the IO-390-D Series Engine Installation and
Operation Manual.
2. Engine Removal Procedure
A. Complete the prerequisites in the section "Engine Removal Prerequisites" in this chapter.
B. Document any indications of scoring, burning, fraying, chafing, unusual wear, or any other
unacceptable condition found when removing engine parts, tubing, hoses, wiring and any
other item disconnected for engine removal. Examine each removed component to determine
if it is serviceable or must be replaced before returning the aircraft to service.
C. Disconnect all connecting control cables.
D. Disconnect any relays, gages, or other indicating devices as per the aircraft manufacturer's
procedure.
CAUTION
© 2020 Avco Corporation. All Rights Reserved
March 2020
USE CARE TO PREVENT DUST, DIRT, SAFETY WIRE, NUTS,
SAFETY CABLE, WASHERS OR OTHER FOREIGN MATTER FROM
ENTERING THE ENGINE. DURING ENGINE REMOVAL, IF ITEMS
ACCIDENTALLY FALL INTO THE ENGINE, STOP WORK, FIND AND
REMOVE ALL OF THE DROPPED ARTICLES. USE CORRECT PLUGS,
CAPS, AND OTHER COVERINGS TO COVER EXPOSED OPENINGS.
INSTALL DUST CAPS OVER, NOT IN, TUBE ENDS.
DO NOT PUT TAPE OR PLUGS INSIDE OPEN LINES OR FITTINGS.
72-00
Page 101
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