72566 Lycoming Starter Ring Gear 12/14 Pitch

Part# 07-03070
MFR Model# 72566


Lycoming's 72566 is a gear starter ring for the company's engines, specifically wide cylinder flange crankcase model engines. This starter ring has a 12/14 pitch that is used on Lycoming's crankshafts and camshafts.

Note: 149 Teeth.
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No problem installing this.

Roger P
January 25, 2018


Please note, Pilotshop's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Pilotshop assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Is Lycoming 72566 the whole assembly including alternator pulley?

It is just the ring gear, no pulley.

Q: What is the diameter of this 72566 Lycoming ring gear?

ID approx 11-3/8". OD approx 12-1/2".

Q: How wide is the gear ring when measured across the teeth?

0.440" wide.

Q: How many teeth does the 72566 LYCOMING STARTER RING GEAR 12/14 PITCH have?

149 teeth.