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l-3. The tools required for overhauling the engine (ex- cluding the ordinary mechanic’s tools found in most overhaul shops) are listed in the Special Service Tool Catalog No. SSP2172. Inspection gages are also listed in the same catalog. Any special information required con-cerning the tools may be obtained by writing to Service Department. Lycoming Division, Williamsport, Pa. 17101. When requesting information concerning any of these tools refer to the tool name and part number.
l-4. Parts catalog for specific models of 16 series engines may be ordered from the department listed in paragraph 1-3. Because of product improvement it is almost impossi- ble to call out attaching part numbers in the overhaul manual. Therefore, it is recommended that a parts catalog be used in conjunction with the overhaul manual. when reassembling the engines.
l-5. Service bulletins, service instructions and service let- ters are issued from time to time whenever the engine is modified or overhaul procedures revised. When received, these publications should be inserted in the rear of this manual or maintained in a separate file for ready reference.
1.6. The following procedures should be followed for any reason that parts are to be returned to Lycoming for warranty. The proper forms must be completed by your
Lycoming Distributor, including the engine model. serial number. “umber of hours in service, the reason the parts are being returned, and any other pertinent informa-tion concerning the parts.
l-7. In this manual all references to locations of various components will be designated when viewing the engine from the rear. The power take off end is considered the front and the accessory drive end the rear. The oil sump is considered the bottom. Cylinders are numbered from front to rear with odd numbered cylinders on the right side and eve” numbered cylinders on the left side.
l-8. The direction of rotation of the crankshaft, as viewed from the rear, is clockwise on all models. All references to direction of rotation of the various accessory drives are as viewed facing the accessory drive mounting pad.
n

Figure l-l. Typical 4 Cylinder Engine
OVERHAUL  MANUAL  LYCOMING  76  SERIES AIRCRAFT  ENGINES  Section2 
GeneralDescription 
SECTION  2 
GENERAL  DESCRIPTION 

2-1. The engines covered in this manual are direct drive, four cylinder, horizontally opposed, air cooled models.
2-2. Cylinders. The cylinders are of air cooled construction with two major parts, head and barrel, screwed and shrunk together. The head is made from an aluminum alloy casting with a fully machined combustion chamber. Valve guides and valve seats are shrunk into machined recesses in the head. The rocker box is an integral part of the cylinder head which forms the housing for both the in-take and exhaust valve rockers.
2-3. The cylinder barrels are machined from a chrome nickel molybdenum steel forging with deep integral cool-ing fins. The interior of the barrels are ground and honed to a specified finish.
　
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