Step 2. Connect The Wiring Harness; Step 3. Install External Accessories (As Necessary); Step 4. Connect The Linkages; Step 5. Install Baffling - Lycoming IO-390-D Series Installation And Operation Manual

Step 2. Connect the Wiring Harness

1. Connect the aircraft engine wiring harness as necessary. Refer to the aircraft manufacturer's
wiring diagram, specifications and drawings.
2. Connect wiring to the starter.

Step 3. Install External Accessories (as necessary)

1. Remove the accessory drive cover plate and gasket.
2. Install the accessory on the supplied pad in accordance with the aircraft manufacturer's
instructions. Refer to Table A-3 or A-4 in Appendix A.
3. If necessary, install the propeller governor; use the manufacturer's supplied gasket and
hardware. Refer to Table A-3 or A-4 in Appendix A.
4. Install the alternator per airframe manufacturer's instructions.

Step 4. Connect the Linkages

Connect the throttle, mixture, and propeller linkages as necessary in accordance with the aircraft
manufacturer's specifications and drawings.

Step 5. Install Baffling

Install baffling around the engine compartment per the aircraft manufacturer's instructions.

Step 6. Install the Compressor Belt (as necessary)

Install the compressor belt (which will drive an aircraft-supplied air conditioning unit) in accordance
with aircraft and compressor manufacturer's instructions.

Step 7. Install the Propeller

CAUTION IF THE CORRECT PROPELLER BUSHING IS NOT INSTALLED IN THE
SPECIFIED LOCATION, THE PROPELLER WILL NOT BE INDEXED
CORRECTLY AND EXCESSIVE PROPELLER BLADE STRESSES CAN
OCCUR.
Install the propeller in accordance with the propeller and aircraft manufacturer's instructions. Make
sure the propeller flange bushings of the correct part number are installed in the correct indexed
location. Refer to the latest revision of Service Instruction No. SI-1098 and any supplements.

Step 8. Connect Fuel Lines

1. Before connection of the main fuel inlet line to the fuel pump, remove all contaminants from
aircraft fuel tanks and fuel lines.
WARNING
2. Remove unwanted material from the aircraft fuel strainer. Let a minimum of 1 gallon (3.8
liters) of fuel flow through the strainer, aircraft fuel filter and fuel supply line.
3. Make sure that the aircraft manufacturer has a fuel filter installed on the aircraft.
4. Remove protective caps from the main fuel inlet.
Engine Installation
Page 18
IO-390-D Series Engine Installation and Operation Manual
REMOVE ANY CONTAMINATION FROM AIRCRAFT FUEL TANKS
AND FUEL LINES. FAILURE TO REMOVE ALL CONTAMINATION
CAN CAUSE PREMATURE FUEL FILTER REPLACEMENT OR
INCORRECT FUEL SYSTEM OPERATION.
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March 2020