Lycoming Hydraulic Roller Tappet Body Assembly, LRT23381
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Lycoming LRT23381 is the hydraulic roller tappet body assembly for Lycoming 4 and 6 cylinder engines built with the roller tappet crankcase (E suffix serial numbers), including the IO-540 series except IO-540-AG1A5. It replaces flat tappet body 72877 in these engines and is not interchangeable with flat faced tappets.
- Roller tappet engines use the same hydraulic units; dry tappet clearance does not change
- Indexed by flats in the crankcase; either orientation 180 degrees apart is acceptable
- Not field repairable: no disassembly, Magnaflux or Zyglo inspection is allowed
- Must be replaced at overhaul, and when the engine is disassembled for a propeller strike or sudden engine stoppage (SB 533)
- Apply make-up engine oil before installation (SI 1059)
Tech Spec
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