Table of Contents
Advertisement
3. Engine Overhaul vs. Engine Rebuild
Engine overhaul is different from engine rebuild as follows:
A. Engine overhaul – Completed by an authorized mechanic using technical data provided by
Lycoming, overhauled to serviceable limits maintaining the engine total time in service.
B. Engine rebuild – Completed only by Lycoming Engines at the factory using (design) data,
returning a zero time in service engine to the customer.
4. Time Between Overhaul (TBO)
NOTICE: Lycoming Service Bulletin No. 240 specifies mandatory parts replacement at
overhaul and during repair or maintenance for all Lycoming engines. Requirements
for replacement of parts for accessories such as magnetos, carburetors, fuel
injectors, and AN fuel pumps are described in the applicable manufacturer's manual.
A. If the engine is operated under usual conditions, overhaul or a factory rebuild is
recommended at every 2200 hours of operation or every 12 years (whichever occurs first)
from the date of manufacture. (For rebuild, the engine is to be shipped back to the factory.)
B. However, if the engine is out of service on a usual basis for 30 days or more or it has been
flown or stored in humid, dusty, or volcanic ash conditions, overhaul or rebuild could be
necessary before the 2200 hours or 12 year TBO.
5. Safety Precautions - Before Engine Maintenance
WARNING
BEFORE THE START OF ANY SERVICE OR MAINTENANCE ON AN
INSTALLED ENGINE OR AN ENGINE ON A TEST STAND CONNECTED
TO POWER, ENSURE THE IGNITION SWITCH IS TURNED OFF AND
DISABLE/DISCONNECT ALL POWER TO THE ENGINE TO PREVENT
ACCIDENTAL ENGINE START-UP. FAILURE TO DISABLE POWER
COULD CAUSE ACCIDENTAL ENGINE START-UP, INJURY, OR DEATH.
ENSURE ALL OBJECTS/PERSONNEL ARE CLEAR OF THE
PROPELLER'S ROTATIONAL ARC. IF POWER IS ON, A LOOSE OR
BROKEN WIRE CAN CAUSE THE ENGINE TO START AND THE
PROPELLER TO TURN WHICH CAN LEAD TO DEATH OR SERIOUS
INJURY OR A PROPELLER STRIKE.
IF IT IS NECESSARY TO COMPLETE OPERATIONAL TESTS ON THE
ENGINE WITH POWER ON, KEEP ALL PERSONNEL AWAY FROM THE
ROTATIONAL RADIUS OF THE PROPELLER TO PREVENT INJURY OR
DEATH ON ENGINE START-UP.
A. Disconnect the battery.
B. Remove access panel(s), cowling(s) and/or baffles for access to areas.
6. Maintenance Practices
A. Obey all safety precautions.
B. Do not reuse a gasket, O-ring, or seal. Install a new gasket, O-ring, or seal during component
installation where a gasket, O-ring, or seal was removed.
C. If maintenance is done that could cause contamination of the internal components of the
engine, complete the "Oil Change Procedure" in Chapter 12-10.
05-00
Page 2
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
© 2021 Avco Corporation. All Rights Reserved
February 2021
Advertisement
Table of Contents
