Supersedes Service Instruction No. 1191 September 28, 1998 MODELS AFFECTED All Lycoming aircraft engines. TIME OF COMPLIANCE As required to determine cylinder compression The condition of the working parts in the combustion chamber of a cylinder can be determined by measuring the static leak rate of the cylinder as compared to the leak rate through an orifice of specified size. This is...

Supersedes Service Instruction No. 1187H DATE: May 23, 1997 MODELS AFFECTED TIO-540-A1A, -A1B, -A2A, -A2B, -A2C, -C1A, -F2BD, -J2B, -J2BD, -N2BD, -AA1AD, -AB1AD, -AF1A, -AF1B, -AG1A; LTIO-540-F2BD, -J2B, -J2BD, -N2BD. TIME OF COMPLIANCE On newly installed engines; before aircraft is flown. Also recommended at 100 hour inspection or at owner's discretion. Although engines are thoroughly tested...

Supersedes Service Instruction No. 1241B DATE: April 18, 1997 MODELS AFFECTED All Textron Lycoming engines. TIME OF COMPLIANCE Prior to initial start after engine change, overhaul, oil cooler replacement or draining or any prolonged period of inactivity. To avoid possible high speed bearing failure resulting from lack of lubrication during initial starts all aircraft engines should be pre-oiled...

Supersedes Service Instruction No. 1094 C DATE: March 25, 1994 MODELS AFFECTED All Lycoming Opposed Series Engines. TIME OF COMPLIANCE As required during aircraft operation. Lycoming strongly recommends that all engine instrumentation be calibrated annually. All instrumentation for manifold pressure, engine RPM, oil temperature, cylinder head temperature, exhaust gas temperature, and turbine inlet...

(Supersedes Service Instruction No. 1425) DATE: January 19, 1988 MODELS AFFECTED All Textron Lycoming Reciprocating Engines. TIME OF COMPLIANCE As required. Field experience has shown that engine oil contamination increases the possibility of sticking and/or stuck valves. This situation occurs when the contaminants in the engine lubrication oil become deposited on the valve stems, restricting the...

DATE: August 15, 1986 MODELS AFFECTED All Avco Lycoming Direct Drive Engines. TIME OF COMPLIANCE Each 100 hour inspection. During each 100 hour inspection, Avco Lycoming Textron recommends the use of one of two methods for checking alignment of engine timing marks prior to timing magneto to engine.

DATE: April 25, 1986 MODELS AFFECTED Avco Lycoming Direct Drive Engines. TIME OF COMPLIANCE At next overhaul or earlier at owner's discretion. A change from constant speed to fixed pitch and vice versa dictates a change in model designation. Replacement nameplates are only issued if the original nameplate is lost. Refer to the latest edition of Service Instruction No. 1304. Engines may be changed...

DATE: July 30, 1976 MODELS AFFECTED O-235; O-290; O, IO, AIO, AEIO, LIO-320 series; O, IO, AIO, AEIO, HIO, LIO-360 series; O-540 series except dual magneto models identified by “D” as 5th character in model designation; IO, AEIO-540 series except IO-540- E1A5, -K1B5, -K1E5, -P1A5, -S1A5 using large volume oil pump and dual magneto models. TIME OF COMPLIANCE At next overhaul. Positive lubrication...

Supersedes Service Instruction No. 1193 DATE: June 12,1970 TIME OF COMPLIANCE As required. In some instances, when a valve or one of its related parts is replaced because of failure, a subsequent failure of the same part is experienced. This is the result of neglecting to determine the cause of failure. For example, the failure of avalve canbe causedby installation ofapush rod of incorrect length...