Steel, Aluminum, Or Magnesium Parts Cleaning - Lycoming IO-390-D Series Maintenance Manual

NOTICE: There are slightly different cleaning procedures for Precision and AVStar injection
nozzles. Refer to the applicable procedure to clean your injection nozzles.
Clean the Precision fuel injection nozzle with:
• Hoppes No. 9 Gun Cleaning Solvent
(1) Soak the nozzles in Hoppes
Cleaning Solvent for 20 minutes.
(2) Rinse the nozzles with Stoddard Solvent and
blow dry with compressed air.
• Alkon Cleaner
(1) The solution concentration of Alkon cleaner
to water is 7 to 8 oz./gal.
(2) Heat the Alkon/water solution to 140°F
(60°C).
(3) Soak the nozzles in the Alkon/Water solution
for one hour.
(4) Rinse the nozzles with clean hot water and
blow dry with compressed air.
• MEK
(1) Soak the nozzles in MEK for one hour.
(2) Rinse the nozzles with clean hot water and
blow dry with compressed air.
• Acetone
(1) Soak the nozzles in acetone for one hour.
(2) Rinse the nozzles with clean hot water and
blow dry with compressed air.
B. Install the injection nozzle per "Injection Nozzle Installation" procedure in Chapter 73-10.

13. Steel, Aluminum, or Magnesium Parts Cleaning

CAUTION DO NOT PUT STEEL AND MAGNESIUM PARTS INTO THE SAME
DECARBONIZING SOLUTION, BECAUSE IT CAN CAUSE CORROSION
OF THE MAGNESIUM PARTS.
DO NOT USE ANY HEATED DECARBONIZING SOLVENT ON
ALUMINUM OR MAGNESIUM PARTS. THE DECARBONIZING SOLVENT
CAN DAMAGE OR CORRODE MAGNESIUM AND ALUMINUM PARTS.
ONLY USE PETROLEUM-BASED DECARBONIZING SOLUTIONS ON
ALUMINUM PARTS.
DO NOT USE CHLORINATED SOLVENTS (SUCH AS
TRICHLOROETHANE, TRICHLOROETHYLENE, "PERC"-DEGREASER,
ETC), TO PREVENT HYDROGEN EMBRITTLEMENT WHICH CAN
WEAKEN A METAL PART AND CAUSE IT TO FAIL.
DO NOT USE WATER-MIXED SOLVENTS THAT CONTAIN CAUSTIC
COMPOUNDS AND/OR SOAP, BECAUSE THEY CAN CAUSE DAMAGE
TO ALUMINUM AND MAGNESIUM PARTS. WHEN THE ENGINE IS
RETURNED TO SERVICE, THESE MATERIALS CAN ENTER THE PORES
OF THE METAL AND CAUSE OIL FOAMING.
05-30
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IO-390-D Series Engine Maintenance Manual
IO-390-D Series Engine Maintenance Manual
Clean the AVStar fuel injection nozzle with:
®
No. 9 Gun
© 2020 Avco Corporation. All Rights Reserved
• MEK
(1) Soak the nozzles in MEK for one
hour.
(2) Rinse the nozzles with clean hot
water and blow dry with compressed
air.
• Acetone
(1) Soak the nozzles in acetone for one
hour.
(2) Rinse the nozzles with clean hot
water and blow dry with compressed
air.
March 2020