Non-Overhaul Removal and Replacement
Teledyne Continental Motors, Inc.
TM
10-38
IOF-550 Permold Series Engine Maintenance Manual
1 April 2007
10-6.3. Ground Strap Installation
Procedure
1.
Clean contact surface thoroughly with MEK or other mild solvent
2.
If Alodine surface is scratched, restore the Alodine treatment according to
instructions in Appendix C.
3.
Install a new ground strap with a bolt and washer at each connection point. Torque to
specification in Appendix B.
4.
Measure continuity between newly installed ground strap and aircraft ground with a
DVM. Resistance should not exceed 0.5 ohms.
5.
Measure continuity between the installed ground strap and the engine with a DVM.
Resistance should not exceed 0.5 ohms.
6.
Perform FADEC Level I Diagnostics in Chapter 8, Troubleshooting.
10-6.4. Electronic Control Unit (ECU) Removal
WARNING
Do not attempt to open the ECU. There are no field serviceable
parts inside. Opening the ECU may cause damage that could
result in abnormal engine operation or loss of power while in
flight. Should an ECU malfunction, replace it with a
serviceable unit. The three ECUs are not interchangeable.
CAUTION: Each ECU is shipped in a sealed, anti-static plastic bag.
Keep the ECU in the sealed bag until it is time to install it on the
engine to prevent damage from electrostatic discharge.
NOTE: Master Power Controller (MPC) and Electronic Control
Unit (ECU) nomenclature refer to the same unit.
Procedure
1.
Disconnect electrical power to the engine and remove the high voltage ignition lead
wires from the ECU. Cut and remove cable ties as necessary to pull the leads clear of
the ECU mounting area.
2.
Place protective covers over the threaded end of each of the ECU spark towers.
3.
Cut and remove cable ties from the engine low voltage harness stalk leading up to the
50-pin connector as necessary.
4.
Cut and remove the 120# cable tie from the 50-pin connector.
5.
Cut and remove the safety wire from the 50-pin connector fasteners.
6.
Loosen the two fasteners until they are fully disengaged from the ECU.
NOTE: The securing screws are held captive in the 50-pin
connector backshell and cannot be removed from the connector.