Transcription of Lycoming SERVICE INSTRUCTION
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Lycoming SERVICE INSTRUCTION
Lycoming652 Oliver StreetWilliamsport, PA 17701 15, 1986 SERVICE INSTRUCTION No. 1029D(Supersedes SERVICE INSTRUCTION No. 1029C)Engineering Aspects areFAA ApprovedDATE:SUBJECT:MODELS AFFECTED:TIME OF COMPLIANCE: tightening Procedures for Crankcase Thru-Studs and BoltsAll Avco Lycoming piston assembling cylinder(s) to Avco Lycoming aircraft engines incorporatebolts and long thru studs that extend through thecrankcase halves primarily for holding themtogether. The studs also secure the cylinders to theirmounting decks on the basic types of thru studs are used: anchoredand anchored-thru studs are threaded into one ofthe crankcase halves; the free-thru studs are not.
Before tightening free-thru studs, make sure that they extend equally from both sides of crankcase. Figure 1. Left Side of Crankcase 3. Using sequences shown in figures 1 thru 11, tighten the 3/8-inch and 1/4-inch nuts at the crankcase parting flange. Torque values are: 3/8-inch nuts, 300 in. lb. (25 ft. lb.);
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