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TEO-540-A1A Engine Installation and Operation Manual
Either a field run-in or a factory run-in procedure is done to ensure that the engine meets all
specifications and is operating correctly. Since a run-in is done on new, rebuilt or overhauled
engines shipped from Lycoming Engines, the field run-in is not necessary. However, a field run-in
procedure herein is done only on engines in the field after any of the following:
• A field-overhauled engine is installed
• Field disassembly and reassembly of the engine for any repair, component replacement, or
inspection that requires separation of the crankcase halves
NOTICE: Refer to the latest revision of Service Instruction No. SI-1427 for any additional details
on the field run-in.
Field Run-In Procedure
Field run-in of fixed wing aircraft includes two procedures, "Preparation for Ground Operational
Test with Engine Installed in Aircraft" and "Ground Operational Test."
1. Preparation for Ground Operational Test with Engine Installed in Aircraft
NOTICE: The "Engine Pre-Oil Procedure" in the "Engine Installation" chapter in this manual
must be already completed before the ground operational test can be done.
A. Ensure that all engine instrumentation is calibrated to ensure accuracy.
CAUTION
B. Install engine intercylinder baffles, airframe baffles/seals, and cowling. All baffles and
seals must be in new or good condition to ensure sufficient cooling airflow differential
across the engine.
C. For optimum cooling during the ground operational test, use a test club propeller. If a test
club is unavailable, a regular flight propeller can be used as long as cylinder head
temperatures are monitored closely.
2. Ground Operational Test
Complete this test while the engine is operating.
WARNING IF THE ENGINE IS OPERATED AT LOW OR NO OIL PRESSURE, THE
CAUTION
NOTICE: Before the ground operational test, the oil cooler system must not have any air locks.
A. Before the start of the ground operational test, examine the oil cooler, propeller, and
governor for metal contamination. These parts must be clean and free of contamination
before the ground operational test can begin. If the engine had failed before overhaul, the
oil cooler, propeller, and governor must be replaced or cleaned and examined by an
approved repair facility.
© 2018 Avco Corporation. All Rights Reserved
October 2018
FIELD RUN-IN
MAKE SURE THAT ALL VENT AND BREATHER LINES ARE
INSTALLED CORRECTLY AND ARE SECURELY IN PLACE IN
ACCORDANCE WITH THE AIRFRAME MAINTENANCE MANUAL.
ENGINE CAN MALFUNCTION OR STOP.
ON TURBOCHARGED ENGINES, OPERATE THE ENGINE AT LOW
SPEED UNTIL THE OIL PRESSURE IS STABLE. OVERBOOST CAN
OCCUR IF THE TURBOCHARGER CONTROL SYSTEM EXPERIENCES
UNUSUAL OIL PRESSURES DUE TO AN OIL TEMPERATURE BELOW
THE MINIMUM OPERATION TEMPERATURE OF 140ºF (60ºC).
Field Run-In
Page 43
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