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4. Engine Installation
A. During engine re-installation:
(1) Refer to and follow the "Maintenance Practices" in Chapter 05-00.
(2) Replace any gaskets, seals or packing that was removed with new parts.
(3) Replace any part that was damaged or that could not be repaired with a new part.
(4) Install external accessories as per the airframe manufacturer's instructions.
(5) Examine the engine mounts to make sure they are not damaged or bent.
B. Install the engine after all inspections and maintenance tasks are complete. Refer to the YO-
233-B2A Engine Installation and Operation Manual.
5. Operational Ground Check After Maintenance
NOTICE: The purpose of this check is to make sure the engine operates according to
specifications in Appendix A of the YO-233-B2A Series Engines Installation and
Operation Manual.
A. Per the component manufacturer's instructions, calibrate the cylinder head temperature gage,
oil temperature gage, oil pressure gage, manifold pressure gage, and tachometer prior to
testing.
B. Make sure that all of the engine gages operate correctly.
C. Make sure that the vent and breather lines are correctly installed and secured in accordance
with the airframe maintenance manual.
D. Install the cowling and all of the intercylinder baffles and airframe baffles.
E. Use a test club during the ground tests.
F. Put the aircraft in a position against the wind.
G. Start the engine and complete the Pre-Flight Test. Refer to the YO-233-B2A Engine
Installation and Operation Manual
6. Idle Speed Mixture Adjustment
A. The goal of this procedure is to adjust the idle speed mixture to an optimum level for
maximum rpm with minimum manifold pressure.
(1) Start the engine and operate until the oil and cylinder head temperatures are in the
specified operating range shown in Appendix A of the YO-233-B2A Engine Installation
and Operation Manual.
(2) Set the throttle stop screw to let the engine idle at the aircraft manufacturer's
recommended idling rpm speed.
(3) When the idle speed is stable, move the cockpit mixture control level with a very slow,
steady pull toward the IDLE CUT-OFF position - but do not let the engine stop. Steadily
move the mixture control lever to the FULL RICH position - while monitoring the
tachometer.
72-00
Page 90
IF YOU CANNOT GET A TEST CLUB, YOU CAN USE THE REGULAR
FLIGHT PROPELLER. IF YOU USE THE FLIGHT PROPELLER,
MONITOR THE CYLINDER HEAD TEMPERATURE.
YO-233-B2A Engine Maintenance Manual
TEO-540-A1A Engine Maintenance Manual
© 2021 Avco Corporation. All Rights Reserved
February 2021
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