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. In-stead, the free-thru studs extend through bothcrankcase halves. Because of their interference fit inthe main bearing webs, the free-thru studs alsoserve as dowels to align the crankcase insure uniform loading on the main bearings, itis necessary to tighten these studs and bolts in a se-quence beginning at the approximate center of theengine and progressing evenly to both front and rearof the engine as described in detail in the different procedures are shown.
the crankcase halves; the free-thru studs are not. In-stead, the free-thru studs extend through both crankcase halves. Because of their interference fit in the main bearing webs, the free-thru studs also serve as dowels to align the crankcase halves. To …
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