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2-4. Lycoming incorporates a color code painted on cylinder heads designating differences in the cylinder bar-rels and spark plug lengths. It is essential that personnel
be familiar with this code as described in the latest edition of Service Instruction No. 1181.
2-5. Damage will result with the use of incorrect piston rings or spark plug lengths. The latest edition of Service Instruction No. 1037 lists the approved piston, pistonring and cylinder assemblies for all models while the latest edition of Service Instruction No. 1042 lists the approvedspark plugs. Consult these publications for correct ap-plication to you particular installation.
2-6. Valve Operating Mechanism. A conventional typecamshaft is located above and parallel to the crankshaft. The camshaft actuates the hydraulic lifter which operates the valve through the push rod and valve rocker. The valve rocker is held in place by the use of the rocker arm fulcrum. The valve spring bears against hardened steel seat and is retained on the valve stem by the use of split key. A rotator cap is used on the stem of the sodium cool-ed exhaust valve. The hydraulic lifter automatically keeps the valve clearance at zero thus eliminating the need for any valve clearance adjusting mechanism.
2-7 Crankcase. The crankcase consists of two reinforced aluminum alloy castings with the accessory housing as an integral part, fastened together by means of thru bolts, studs and nuts. The mating surfaces are joined without use of gaskets and the main bearing bores are machined for use of precision type bearing inserts.
Descriptionof Engine ModelCode
Example: TIO 541 EIB4D
PREFIX DISPLACEMENT SUFFIX L-LefthandEngineRotation 000* E -PowerSection8 Rating
Cubicin.
T-Turbocharged I -NoseSection
V -VerticalHelicopter B -AccessorySection
H-Horizontal ApplicationHelicopter 4-Counterweight
A-Aerobatic D-Dual Magneto *NcNote: integalDual
(001)"I"Indicates I -Fuel Injected acacessorydrive
G-GearedNoseSection Subsequent toModels
changes S -Supercharged arereflectedin this Section
0 -Opposed Cylinder
Figure 2-1. Description of Engine Code Section2 OVERHAUL MANUAL LYCOMING 76 SERIES AIRCRAFT ENGINES
GeneralDescription
2-8. Crankshaft. The crankshaft is made from a chrome nickel molybdenum steel forging and all journal surfaces are nitrided.
2-9. Crankshaft Counterweights. A system of dynamic counterweight, to eliminate torsional vibration, is employed on some four cylinder engines. Consult the latest edition of Service Instruction No. 1012 for the pro-per combination and location of the crankshaft.
2-10. Connecting Rods. The connecting rods are made in the form of "H" sections from alloy steel forgings. They have replaceable bearing inserts in the crankshaft ends and split type bronze bushings in the piston ends. The bearing caps on the crankshaft end of the rods are retain-ed by two bolts through each cap secured by a nut.
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