Superior Starter Ring Gear - SL72566 replaces Lycoming's 72566 for a more economical robust starter ring gear solution. FAA approved under Superior's PMA. This gear has 149 teeth.
Question - What is a starter ring gear?
Answer - A starter ring gear is a geared part attached to an internal combustion engine that is part of the assembly that transfers the torque from the starter motor to the engine's crankshaft. This is required in order to start the engine. The starter ring gear is usually made from medium carbon steel.
Starter ring gears are attached to either the flywheel or the flexplate of an engine. The teeth of the ring gear are driven by the smaller gear (known as the pinion or Bendix) of the starter motor. The pinion engages the starter ring only during the engine starting process and once the engine is running the pinion withdraws.
Alternate Part Numbers: AEL72566
OEM Part Number: 72566
This particular product is compatible with over 20 Lycoming engines. See the table below for the list. You can also view the included Superior PMA document also showing FAA approval and which engines this starter ring gear SL72566 works on. This document is found at the bottom of this page in a click-able hyperlink or by clicking HERE.
O-235 -C2A
HO-360 -B1A, -B1B
AIO-320 -B1B, -C1B
AEIO-360 -A1E, -B1G6, -H1A
O-320 -A2A, -A2B, -A2C, -A2D, -A3A, -A3B, -A3C, -B2A, -B2B, -B2C, -B3A, -B3B, -B3C, -D1A, -D1D, -D1F, -D2A, -D2B, -D2C, -D2G, -D2J, -D3G, -E1A, -E1F, -E2A, -E2B, -E2C, -E2D, -E2F, -E2G, -E2H, -E3D, -E3H, -H2AD
O-290 -D, -D2, -D2B
AEIO-540 -D4B5, -L1B5D
IO-320 -B1A, -B1C, -C1A, -D1A, -D1B, -E2A
AIO-360 -A1A, -A1B, -B1B
HIO-360 -A1A, -B1A, -C1A, -C1B, -D1A, -E1AD, -E1BD, -F1A
IO-540 -A1A5, -B1A5, -B1C5, -C1B5, -C4B5, -C4C5, -C4D5D, -D4A5,E1A5, -E1B5, -G1A5, -G1B5, -G1C5, -G1D5, -G1E5, -G1F5, -J4A5, -K1A5, -K1A5D, -K1B5, -K1C5, -K1D5, -K1E5, -K1F5, -K1F5D, -K1G5, -K1G5D, -K1J5, -K1J5D, -K1K5, -L1C5, -M1A5, -M1B5D, -N1A5, -P1A5, -R1A5, -S1A5, -T4A5D, -T4B5D, -T4C5D, -V4A5D, -W1A5D, -AA1A5 IO-360-A1A, -A1B, -A1B6, -A1B6D, -A1C, -A1D, -A1D6, -A2A, -A2B, -A3B6D, -B1A, -B1B, -B1D, -B1E, -B1F, -B2F, -B2F6, -B4A, -C1A, -C1B, -C1C, -C1C6, -C1D6, -C1E6, -C1F, -J1A6D IVO-360-A1A
TO-360 -C1A6D, -E1A6D
TIO-360 -A1B, - C1A6D O-360-A1A, -A1AD, -A1C, -A1D, -A1F6, -A1F6D, -A1G6, -A1G6D, -A1LD, -A2A, -A2D, -A2E, -A2F, -A2G, -A3A, -A3AD, -A4A, -A4G, -A4J, -A4K, -A4M, -A4N, -A5AD, -B2A, -C1A, -C1C, -C1E, -C1F, -C1G, -C2A, -C2C, -C2D, -C2E, -D2A, -D2B, -E1A6D, -F1A6
O-540 -A1A, -A1A5, -A1B5, -A1C5, -A1D, -A1D5, -A2B, -A3D5, -B1A5, -B1B5, -B2B5, -B2C5, -B4B5, -E4A5, -E4B5, -E4C5, -F1A5, -F1B5, -G1A5, -G2A5, -H1B5D, -H2B5D, -J1A5D, -J3A5D, -J3C5D, -L3C5D VO-360-A1A, -A1B, -B1A
TIO-540 -A1A, -A1B, -A2A, -A2B, -A2C, -C1A, -E1A, -F2BD, -G1A, -H1A, -J2B, -J2BD, -N2BD, -R2AD, -S1AD, -V2AD, -AA1AD, -AB1AD
TIO-541-A1A, -E1A4, -E1B4, -E1C4