Service Bulletin No. 632 B

Identification of Connecting Rods with Non-Conforming Small End Bushings

  • Publications
DATE:

August 4, 2017

MODELS AFFECTED:

(1) Engines with a serial number listed in Table 1 of this Service Bulletin
(2) Engines that have been overhauled or repaired that could contain connecting rod assemblies or connecting rod bushings shipped from Lycoming during dates identified in Table 2 of this Service Bulletin

TIME OF COMPLIANCE:

Within the next 10 hours of engine operation

REASON FOR REVISION:

Clarified MODELS AFFECTED; added NOTICE on page 1; clarified Steps 1.B and 4.B in “Required Action”; under the “Connecting Rod Bushing Press-Out Verification Procedure” - deleted Step 1 (reference to SB-630), added new Steps 7, 9, and 10 and new Figure 9 for better measuring procedure for indication of bushing movement, clarified the NOTICE after Step 11.A.(2) on page 5; added text to “use new seals and gaskets” in Steps 11.A.(4) and 11.B.(2) on pages 5 to 6; added IO-580 and AEIO-580 engine models to row for LW-12034 in the Top Overhaul Gasket Kit table on page 9.

Please review Service Bulletin 632 Frequently Asked Questions.

Product Support Network

Wherever you are in the world, you have access to exceptional expertise and knowledge about Lycoming engines. Get the most comprehensive customer service and support in the general aviation industry.

Get It Exchanged

Use our Engine Exchange Program to order a new, rebuilt, or overhauled engine to experience more airtime and less downtime.