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Fuel Manifold Spring Change

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This Service Instruction identifies a new 4 psi flow divider spring Precision P/N 2577011 that is available as a replacement for the 2 psi flow divider spring for improved idle characteristics, especially in hot weather, for Lycoming engine models IO-360-L2A, IO-540-AB1A5, IO-540-AC1A5, and TIO-540-AJ1A. This Service Instruction is NOT a substitute for adjusting the fuel system and idle RPM. A check of the fuel adjustment must be done after the spring is installed.