2003 Lycoming. All rights reserved. Lycoming and "Powered by Lycoming" are trademarks or registered trademarks of Lycoming.

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3 O-50-AD5 Engine Parts Catalog Lycoming Part Number: PC Lycoming. All rights reserved. Lycoming and "Powered by Lycoming" are trademarks or registered trademarks of Lycoming. All brand and product names referenced in this publication trademarks of their respective companies. are trademarks or registered For additional information: Mailing address: Lycoming 5 Oliver Street Williamsport, PA 770 U.S.A. Phone: Factory: Sales Department: Fax: Lycoming's regular business hours are Monday through Friday from 8:00 A.M. through 5:00 P.M. Eastern Time (+5 GMT) Visit us on the World Wide Web at:

4 O-50-AD5 PARTS CATALOG This illustrated parts catalog contains a complete parts listing for the Lycoming O-50-AD5 wide cylinder flange crankcase model aircraft engines. Major assembly and sub-assembly parts of the engine are listed in the Group Assembly sections in the general sequence of engine build up. A Service Kits section and Oversize and Undersize Parts List are included to aid in ordering parts as necessary during overhaul. The Numerical Index is provided for convenience in finding parts when only the part number is known. Parts coverage of Vendor Accessories used on Lycoming engines may be found in the appropriate Vendor's Parts Catalog. A list of addresses of where to obtain these publications appears in the latest edition of Service Letter No. L. NOTE The illustrations, pictures and drawings shown in the publication are typical of the subject matter they portray. This catalog, when used in conjunction with the appropriate overhaul manual, shall be used for parts identification only. Under no circumstances shall this catalog be used as an assembly or installation document. Any reference in this document to a suppliers/parts manufacturer's product, by name, trademark, part number or other description is solely for the purposes of identificationand does not indicate or infer that Lycoming accepts responsibility for quality control and/or airworthiness of parts which do not pass through the Lycoming quality control system. 003 by Lycoming, "All Rights Reserved." All Lycoming publications are to be considered copyrighted and may not be reproduced without permission of the company. SERVICE BULLETINS, INSTRUCTIONS AND LETTERS Although the information contained in this parts catalog is up-to-date at time of publication, users are advised to procure current information through all Lycoming distributors or from the factory by subscription. Consult the latest edition of Service Letter No. L for subscription information. HOW TO ORDER PARTS In ordering parts for your engine, observe the following instructions which will expedite shipment of correct parts required without delay. a. Always specify the model and serial number of your engine. b. Always specify part number, nomenclature and quantity required.

5 0-50-AD5 PARTS CATALOG SECTION TABLE OF CONTENTS PAGE In tro d u ctio n... i Table of Contents ii Oversize and Undersize Parts Listing iii. CRANKCASE, CRANKSHAFT AND CAMSHAFT GROUP C rankcase A ssem bly... - Oil Level Gage and Engine Mounting Brackets C rankcase R elated Parts Crankshaft and Counterweight Assembly Camshaft, Tachometer Drive and Crankshaft Idler Gears Propeller Governor Drive Assembly... - Crankcase Attaching Parts ACCESSORY HOUSING AND RELATED PARTS Accessory Housing Assembly Oil Pump Assembly and Accessory Housing Attaching Parts Fuel Pum p A ssem bly Oil Filter Assembly and Oil Cooler Bypass Valve Vacuum and Hydraulic Pump Drives and Covers CYLINDER, PISTON AND VALVE TRAIN Connecting Rods, Pistons and Ring Assemblies C ylinder A ssem bly Valve Assembly and Related Parts C ylinder R elated Parts IGNITION SYSTEM Slick Magnetos, Magneto Drives, Slick Harnesses and Spark Plugs ELECTRICAL SYSTEM Sky-Tee Starter and Attaching Parts Alternator Assembly and Belt Alternator Mounting and Attaching Parts OIL SUMP AND INDUCTION SYSTEM Oil Sump Assembly and Oil Suction Screen... - Intake Pipe Assembly Carburetor and Related Parts SERVICE KITS SECTION 7-8. NUMERICAL INDE 8- ii

6 O-50-AD5 PARTS CATALOG Oversize and Undersize Parts Listing PART NO. DESCRIPTION P0 P P0.00 OVERSIZE P5 P P P0.00 P UNDERSIZE M03 M0 M GUIDE 0 BUSHING 79 INSERT 979 DOWEL 7057 SEAT 7058 SEAT 755-S BUSHING 7380 BUSHING 755-S BUSHING 7557-S BUSHING LW-997 SEAL LW-35 BEARING * * * LW-379 SEAL STD-05 DOWEL R9 GUIDE 8M9389 BEARING * * * 8A9 BEARING 8D335 BEARING * Also available in P0 oversize. Also available in P5 oversize. In addition to the above, studs are available in P03, P07 & P. NOTE When ordering oversize and undersize parts, be sure to specify the required oversize and undersize dimension with the proper part number. For example, to order bearing LW-35 in.003 undersize, order part number LW-35- M03. Oversize code letter is "P" while undersize code letter is "M". These letters are then followed by the number designating the size in thousandths of an inch. iii

7 O-50-AD5 PARTS CATALOG CRANKCASE, CRANKSHAFT AND CAMSHAFT GROUP CRANKCASE ASSEMBLY FIG. REF. PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY E000-S CRANKCASE ASSEMBLY LW-379 STUD, 5/-8 x.00 long, drilled 3C- 3C-3 STUD, 5/-8 x -/ long STUD, 5/-8 x -5/8 long 38-3 STUD, 3/8- x -5/8 long 50-5 STUD, /-3 x -7/8 long 38- STUD, 3/8- x -3/ long 38D-7 STUD, 3/8- x -/8 long, drilled 38- STUD, 3/8- x.00 long DOWEL, Crankshaft bearing STD-5 DOWEL, 5/ dia. x / long STD-557 DOWEL, / dia. x / long 758 BUSHING, Gov. drive idler shaft STD-339 * PLUG, /-7 pipe 7 0 PLUG, /8 pipe 3C- STUD, 5/-8 x -3/ long * at governor pad, at piston squirt holes. -

8 LYCOM ING 0-50-AD5 PARTS CATALOG 5 Figure. CRANKCASE ASSEMBLY -

9 O-50-AD5 PARTS CATALOG CRANKCASE, CRANKSHAFT AND CAMSHAFT GROUP OIL LEVEL GAGE AND ENGINE MOUNTING BRACKETS FIG. REF. PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 7057 GASKET, Oil filler extension ETENSION, Oil filler (short), -/ long "O" RING, Oil level gage LW-75 GAGE ASSY., Oil level 5 A9770 BRACKET, Engine mounting (dynafocal) STD-33 WASHER, 3/8 plain 7 STD-78 WASHER, 3/8 lock, internal teeth 8 STD-59 NUT, 3/8- plain -3

10 O-50-AD5 PARTS CATALOG Figure. OIL LEVEL GAGE AND ENGINE MOUNTING BRACKETS -

11 O-50-AD5 PARTS CATALOG CRANKCASE, CRANKSHAFT AND CAMSHAFT GROUP CRANKCASE RELATED PARTS FIG. REF. 3 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 08-B 08 * 88 * 777 * LW-73 * LW-8085 * 3 0E D335 LW-7 8A9 LW LW-997 ** LW-379 ** BALL, / dia. SPRING, Oil pressure relief valve SPRING, Oil pressure relief valve SPRING, Oil pressure relief valve SPRING, Oil pressure relief valve SPRING, Oil pressure relief valve GASKET, -/ I.D. x -/ O.D. x 3/3 annular VALVE ASSY., Oil pressure relief, adjustable BEARING, Crankshaft BEARING, Crankshaft (alternate) BEARING, Crankshaft, front BEARING, Crankshaft, front (alternate) SEAL, Crankshaft oil, split SEAL, Crankshaft oil, solid RING, Oil seal, 3/ I.D. x 7/ dia. section BODY, Hydraulic tappet * Select spring to give a minimum of three threads exposed on adjusting screw to allow field adjustment. Reference latest revision of SSP-77, Part I for spring identification. ** Refer to latest edition of Lycoming Service Instruction No. 3 for installation. -5

12 O-50-AD5 PARTS CATALOG Figure 3. CRANKCASE RELATED PARTS -

13 0-50-AD5 PARTS CATALOG CRANKCASE, CRANKSHAFT AND CAMSHAFT GROUP CRANKSHAFT AND COUNTERWEIGHT ASSEMBLY FIG. REF. PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 3E7 CRANKSHAFT AND BUSHING ASSY. STD- PLUG,.00 dia. expansion 7380 BUSHING, Crankshaft dyn. counterweight 70 PLUG, -3/8 dia. 755-S BUSHING, Propeller flange, long 755-S BUSHING, Propeller flange, short 7557-S BUSHING, Propeller flange, indexing STD- 05 DOWEL, Stepped, 5/ x / dia. x 35/ long LW-97 * COUNTERWEIGHT ASSEMBLY 7903-A BUSHING, Dynamic counterweight 7797 * ROLLER, Dynamic counterweight,.3 order 795 * ROLLER, Dynamic counterweight, 5. order LW-80 RING, Internal retaining 7907 WASHER, Dynamic counterweight 3S97 ** GEAR, Crankshaft LW-838 LOCKPLATE, Crankshaft gear STD-7 BOLT, 5/- UNF-3 x -3/ long, hex. hd. LW-7 SUPPORT ASSY., Starter ring gear, / pitch 75 GEAR, Starter ring, / pitch * See latest edition of Lycoming Service Instruction No. 0 for proper counterweight and roller location. ** See latest edition of Lycoming Service Bulletin No. 75 for proper installation. CRANKSHAFT & COUNTERWEIGHT ASSEMBLY, Kit P/N 05K77 available. -7

14 O-50-AD5 PARTS CATALOG 3 NO. CRANKPIN -0 7 INDE Figure. CRANKSHAFT AND COUNTERWEIGHT ASSEMBLY -8

15 O-50-AD5 PARTS CATALOG CRANKCASE, CRANKSHAFT AND CAMSHAFT GROUP CAMSHAFT, TACHOMETER DRIVE AND CRANKSHAFT IDLER GEARS FIG. REF. 5 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY LW-930 CAMSHAFT ASSEMBLY 78 SPACER, Tachometer shaft centering SHAFT ASSEMBLY, Tachometer LW-87 PIN, 3/ dia. x -/ long 5 STD-3 RING, Internal retaining 5 PLUNGER, Fuel pump, long 7 75 GEAR ASSEMBLY., Crankshaft idler BUSHING, Crankshaft idler gear 9 78 GEAR ASSEMBLY, Crankshaft idler, plain BUSHING, Crankshaft idler gear LW-3795 SHAFT, Crankshaft idler gear LW-3 H0.88 BOLT, 5/-8 x 7/8 long, hex. hd., dr. 3 STD-8 NUT, 5/-8 NC-3 slotted shear -9

16 O-50-AD5 PARTS CATALOG 8 Figure 5. CAMSHAFT, TACHOMETER DRIVE AND CRANKSHAFT IDLER GEARS -0

17 O-50-AD5 PARTS CATALOG CRANKCASE, CRANKSHAFT AND CAMSHAFT GROUP PROPELLER GOVERNOR DRIVE ASSEMBLY FIG. REF. PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY LW-0 GEAR, Propeller governor driven 3 LW-0 LW-05 SHAFT, Propeller governor idler gear GEAR ASSEMBLY, Propeller governor idler 7787 BUSHING, Propeller governor idler gear 5 STD-9 DOWEL, 3/3 dia. x 7/3 long 7 STD L8 DOWEL, 3/3 dia. x 9/3 long WASHER, Thrust WASHER, Thrust WASHER, Thrust WASHER, Thrust WASHER, Thrust A AR AR AR AR AR 8 AN55B03H5 * SET SCREW, No. 0-3 x 5/ long GASKET, 5/3 I.D. x -/8 O.D. x /3 thick 0 LW-389 PLUG, 3/- hex. hd GASKET, Governor 7378 COVER, Governor drive 3 STD-35 WASHER, 5/ plain 0 STD-75 WASHER, 5/ lock, internal teeth 5 STD-0 NUT, 5/-8 plain * For alternate set screws and installation information, see latest edition of Lycoming Service Instruction No

18 O-50-AD5 PARTS CATALOG Figure. PROPELLER GOVERNOR DRIVE ASSEMBLY -

19 O-50-AD5 PARTS CATALOG CRANKCASE, CRANKSHAFT AND CAMSHAFT GROUP CRANKCASE ATTACHING PARTS FIG. REF. 7 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY LW BOLT, /-0 x -/ long, hex. hd. STD-8 WASHER, / plain 0803 STRAP, Lifting LW BOLT, /-0 x -3/ long, hex. hd. LW-5-.3 BOLT, /-0 x -/8 long, hex. hd. STD-0 WASHER, / lock, internal teeth 3 STD- NUT, /-0 plain LW-5S.50 BOLT, /-0 x -/ long, hex. hd., dr. end STD-8 WASHER, / plain (max. 8) AR STD-09 NUT, /-0 slotted shear STD-33 WASHER, 3/8 plain STD-87 NUT, 3/8- slotted AN-3A BOLT, 3/8- x 3-37/ long, hex. hd. STD-33 WASHER, 3/8 plain 3 STD-78 WASHER, 3/8 lock, internal teeth STD-59 NUT, 3/8- plain 70 STUD, /-0 x 0-5/ long 8 LW BOLT, 5/-8 x -3/ long, hex. hd. LW-3-. BOLT, 5/-8 x -5/3 long, hex. hd. 3 STD-35 WASHER, 5/ plain STD-75 WASHER, 5/ lock, internal teeth -3

20 LCYOMING O-50-AD5 PARTS CATALOG,,,7,,,7, Figure 7. CRANKCASE ATTACHING PARTS -

21 0-50-AD5 PARTS CATALOG ACCESSORY HOUSING AND RELATED PARTS ACCESSORY HOUSING ASSEMBLY FIG. REF. 8 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 7388 GASKET, Accessory housing C539-0 HOUSING ASSY., Accessory 3 3C- STUD, 5/-8 x -/ long 3C- STUD, 5/-8 x -5/8 long 5 5C- STUD, /-0 x -5/8 long 3CD-7 STUD, 5/-8 x -/8 long, drilled PLUG, /8-7 NPT, Allen head 8 STD-78 PLUG, 3/8 pipe, Allen head -

22 O-50-AD5 PARTS CATALOG Figure 8. ACCESSORY HOUSING ASSEMBLY -

23 O-50-AD5 PARTS CATALOG ACCESSORY HOUSING AND RELATED PARTS OIL PUMP ASSEMBLY AND ACCESSORY HOUSING ATTACHING PARTS FIG. REF. 9 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 7853 BODY ASSY., Oil pump 05K93-S * OIL PUMP IMPELLER KIT 3 7 SHAFT, Oil pump drive STD-35 WASHER, 5/ plain 3 5 STD- 0 NUT, 5/-8 slotted 3 LW-0 SEAL, Tachometer drive, oil 7 STD-8 WASHER, / plain 8 STD-0 WASHER, / lock, internal teeth 9 LW BOLT, /-0 x 5/ long, hex. hd. 9 0 LW-5-.3 BOLT, /-0 x -/8 long, hex. hd. LW-5-. BOLT, /-0 x -7/ long, hex. hd. * To insure impellers are replaced together, oil pump impellers available in kit form only. -3

24 O-50-AD5 PARTS CATALOG Figure 9. OIL PUMP ASSEMBLY AND ACCESSORY HOUSING ATTACHING PARTS -

25 O-50-AD5 PARTS CATALOG ACCESSORY HOUSING AND RELATED PARTS FUEL PUMP ASSEMBLY FIG. REF. 0 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 009 GASKET, Fuel pump LW-57 FUEL PUMP, Dual diaphragm 3 STD-33 WASHER, 3/8 plain STD-88 SCREW, 3/8- x -9/3 long, socket dr ELBOW, 3/8 flared tube, adjustable, 90 MS95-0 "O" RING -5

26 L 0-50-AD5 PARTS CATALOG 5 5 Figure 0. FUEL PUMP ASSEMBLY -

27 0-50-AD5 PARTS CATALOG ACCESSORY HOUSING AND RELATED PARTS OIL FILTER ASSEMBLY AND OIL COOLER BYPASS VALVE FIG. REF. PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY LW-795 * GASKET, Oil filter adapter 7785 OIL FILTER BASE ASSEMBLY LW-35 * OIL FILTER, Short, spin-on STD-8 WASHER, / plain STD-0 WASHER, / lock, internal teeth STD- NUT, /-0 plain LW BOLT, /-0 x.00 long, hex. hd. STD- 0 WASHER, / lock, internal teeth 53E VALVE ASSY., Temp. control oil cooler bypass 750 GASKET, Valve assembly 5C-0 STUD, /-0 x -/ long 0E GASKET, Annular, 5/8 I.D. 7 PLUG, Oil cooler bypass MS08-8 ELBOW, / flared tube, 3/8 NPT AN8-8 NIPPLE, / flared tube 799 FITTING, Breather * Extra gasket and oil filter, shipped as loose parts, with engine. NOTE Reference latest edition of Lycoming SSP-885 for oil filter kits and replacement filters. -7

28 O-50-AD5 PARTS CATALOG Figure. OIL, FILTER ASSEMBLY AND OIL COOLER BYPASS VALVE -8

29 0-50-AD5 PARTS CATALOG ACCESSORY HOUSING AND RELATED PARTS VACUUM AND HYDRAULIC PUMP DRIVES AND COVERS FIG. PART QUANTITY REF. NUMBER DESCRIPTION PER ASSEMBLY 83 GASKET, Accessory adapter 753 ADAPTER ASSY., Vacuum pump 3 STD-77 PIN, /8 dia. x / long 0A995 OIL SEAL, 7/8 I.D. x -/ O.D. x 5/ wide GEAR ASSY., Vacuum pump driven 759 WASHER, Accessory drive gear GASKET, Vacuum pump COVER, Vacuum pump 9 STD-8 WASHER, / plain 0 STD-0 WASHER, / lock, internal teeth STD- NUT, /-0 plain 955 GASKET, Accessory drive adapter 3 90 COVER, Governor drive adapter pad STD-35 WASHER, 5/ plain 5 STD-75 WASHER, 5/ lock, internal teeth STD-0 NUT, 5/-8 plain -9

30 O-50-AD5 PARTS CATALOG _ Figure. VACUUM AND HYDRAULIC PUMP DRIVES AND COVERS -0

31 O-50-AD5 PARTS CATALOG CYLINDER, PISTON AND VALVE TRAIN CONNECTING RODS, PISTON AND RING ASSEMBLIES FIG. REF. 3 PART NUMBER DESCRIPTION.QUANTITY PER ASSEMBLY LW-750 CONNECTING ROD ASSEMBLY LW-393 BUSHING, Connecting rod, upper BOLT, Connecting rod LW-8 NUT, Connecting rod bolt 5 8M9389 BEARING, Connecting rod LW-35 BEARING, Connecting rod (alternate) PISTON, Compression ratio 8.50: 7 LW-078 * PIN, Piston * PLUG, Piston pin 9 7 RING, Piston compression 0 H950 RING, Piston, oil regulating (expander type) * See latest edition of Lycoming Service Instruction No

32 LYC OMIG 0-50-AD5 PARTS CATALOG Figure 3. CONNECTING RODS, PISTON AND RING ASSEMBLIES 3-

33 0-50-AD5 PARTS CATALOG CYLINDER, PISTON AND VALVE TRAIN CYLINDER ASSEMBLY FIG. REF. PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY LW-7 CYLINDER AND HEAD ASSY., Nitrided 7057 SEAT, Intake valve 7058 SEAT, Exhaust valve 8 * GUIDE, Valve intake, flanged R9 * GUIDE, Valve exhaust, flanged 79 INSERT, Spark plug, 8-.5 MM STD-353 INSERT, No. 0- Heli-coil x 3/8 long 3C- STUD, 5/-8 x -/ long 5C-8 STUD, /-0 x.00 long MS083-D ELBOW, 5 x 3/8 flared tube 0 BUSHING, Rocker shaft 0 ** PLUG, /8-7 NPT, Allen head LW-99 GASKET, Exhaust flange 0 FLANGE, Exhaust, stainless STD-35 WASHER, 5/ plain STD-75 WASHER, 5/ lock, internal teeth STD-0 NUT, 5/-8 plain * See latest edition of Lycoming Service Instruction No. 5. ** Assemble in cylinder head. 3-3

34 O-50-AD5 PARTS CATALOG Figure. CYLINDER ASSEMBLY 3-

35 O-50-AD5 PARTS CATALOG CYLINDER, PISTON AND VALVE TRAIN VALVE ASSEMBLY AND RELATED PARTS FIG. REF. 5 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY VALVE, Intake LW-900 VALVE, Exhaust (rotator type) 3 LW-795 SPRING, Valve, inner LW-800 SPRING, Valve, outer 5 LW-0077 SEAT, Valve spring, upper intake 5 SEAT, Valve spring, lower intake 7 LW-333 SEAT, Valve spring, lower exhaust 8 LW-75 SEAT, Valve spring, upper exhaust (rotator type) C9 KEY, Valve intake KEY, Valve exhaust (rotator type) 7C938 CAP, Valve stem, exhaust (rotator type) B39 LW-85 PLUNGER ASSY., Hydraulic tappet SOCKET, Push rod, hydraulic tappet SHROUD TUBE ASSY., Push rod 5 LW-995 SPRING, Shroud tube LW-7 LOCKPLATE, Shroud tube 7 STD- NUT, /-0 plain 8 LW-8 SEAL, Shroud tube SEAL, Shroud tube 0 5F * ROD ASSY., Push (A total of reqd.) AR 5F * ROD ASSY., Push (A total of reqd.) AR 5F * ROD ASSY., Push (A total of reqd.) AR 5F * ROD ASSY., Push (A total of reqd.) AR 7F9357 ROCKER ASSY., Valve intake and exhaust 737 BUSHING, Valve rocker, intake and exhaust 3 LW-3790 SHAFT, Valve rocker LW-89 THRUST BUTTON, Rocker shaft * See latest edition of Lycoming Service Instruction No. 00 for complete push rod application. 3-5

36 O-50-AD5 PARTS CATALOG Figure 5. VALVE ASSEMBLY AND RELATED PARTS 3-

37 O-50-AD5 PARTS CATALOG CYLINDER, PISTON AND VALVE TRAIN CYLINDER RELATED PARTS FIG. REF. PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 7590 GASKET, Rocker box cover 7 COVER, Rocker box STD-95 SCREW, /-0 x 5/8 long, pan. hd., self-locking 3 78 RING, Oil seal, 3/3 dia. x -7/3 I.D SPACER, 33/ I.D. x 7/8 O.D. x /8 thick 7887 SPACER, 33/ I.D. x 7/8 O.D. x 3/8 thick 383-B NUT, 3/8- plain STD-090 NUT, /-0 plain 8 STD-8 NIPPLE, Straight, 3/8 I.D. hose STD-8 HOSE, 3/8 I.D. x -/ long LW CLAMP, Hose 8759 TUBE ASSY., Cyl. head oil drain, cyl. no TUBE ASSY., Cyl. head oil drain, cyl. no. 87 TUBE ASSY., Cyl. head oil drain, cyls. no. 3,, 5, BAFFLE ASSY., Intercylinder 7 RETAINER, Intercylinder baffle 70 HOOK, Intercylinder baffle retainer 3-7

38 O-50-AD5 PARTS CATALOG 7. _ 8 Figure. CYLINDER RELATED PARTS 3-8

39 YCOMING O-50-AD5 PARTS CATALOG IGNITION SYSTEM SLICK MAGNETOS, MAGNETO DRIVES, SLICK HARNESSES AND SPARK PLUGS FIG. REF. 7 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY COUPLING, Magneto drive 7303 COUPLING, Magneto drive LW-3 CUSHION, Magneto drive LW-909 GEAR ASSY., Retainer 75 BALL BEARING GASKET, Magneto adapter LW-707 ADAPTER, Magneto LW-8 GASKET, Magneto LP-OSCNN MAGNETO, Slick, Plain (350) LR37SCNN MAGNETO, Slick, Retard (393) 7U008 HARNESS, Right, Slick M-878 7U009 HARNESS, Left, Slick M-877 M95 CLAMP, Magneto STD-75 WASHER, 5/ lock, internal teeth STD-0 NUT, 5/-8 plain STD-73 COTTER PIN, 3/3 dia. x 3/ long 8-E7 * SPARK PLUG, Champion (REM38E) or Auburn (SR8) 0P BAG, Magneto harness attaching * Item No. 7 spark plugs are used in current production only. Additional spark plugs are available for this engine. See latest edition of Lycoming Service Instruction No. 0 for complete listing of all approved spark plugs. ** See page - for a breakdown of individual parts contained in the magneto and harness attaching parts bag. These parts to be attached by customer per engine line drawing included in each bag. -

40 0-50-AD5 PARTS CATALOG 0P ATTACHING PARTS LW--5-5 LW-00 STD-8 STD-0 STD LW--5- STD-9 LW-M-37 STD- CLIP, One wire CLIP, Two wire WASHER, / plain WASHER, / lock SCREW, /-0 x 3/ long ZIP STRAP CLAMP WASHER, / plain PLATE Spark plug cable NUT, /-0 plain Figure 7. SLICK MAGNETOS, MAGNETO DRIVES, SLICK HARNESSES AND SPARK PLUGS -

41 O-50-AD5 PARTS CATALOG ELECTRICAL SYSTEM SKY-TEC STARTER AND ATTACHING PARTS FIG. REF. 8 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 3B05 STARTER, Sky-Tec (9- LS) STD-75 WASHER, 5/ lock, internal teeth 3 LW-3-. BOLT, 5/-8 x -5/3 long, hex. hd. STD-0 NUT, 5/-8 plain 3 NOTE See latest edition of Lycoming Service Instruction No. 5 for complete listing of FAA approved starters, generators, alternators, regulators and relays. 3 Figure 8. SKY-TEC STARTER AND ATTACHING PARTS 5-

42 O-50-AD5 PARTS CATALOG ELECTRICAL SYSTEM ALTERNATOR ASSEMBLY AND BELT FIG. REF. 9 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 3C9553 ALTERNATOR ASSY., Volt, 70 Amp. LW-3 ALTERNATOR, (ALU-85-LS) 3 3B98 37A PULLEY, Alternator BELT, Alternator drive, 3/8 wide NOTE See latest edition of Lycoming Service Instruction No. 5 for complete listing of FAA approved starters, generators, alternators, regulators and relays. A Figure 9. ALTERNATOR ASSEMBLY AND BE,T 5-

43 O-50-AD5 PARTS CATALOG ELECTRICAL SYSTEM ALTERNATOR MOUNTING AND ATTACHING PARTS FIG. REF. 0 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 07A97 BRACKET, Alternator LOCKPLATE, 5/ bolt x.00 spacing 3 LW BOLT, 5/-8 x 5/ long, hex. hd LINK, Alternator adjusting 5 STD-35 WASHER, 5/ plain LW-3 H0.75 BOLT, 5/-8 x 3/ long, hex. hd. dr. 7 STD-77 WASHER, Plain, 3/ O.D. x /3 I.D. x /8 thick 8 LW-3 H0.75 BOLT, 5/-8 x 3/ long, hex. hd. dr. 9 07F38 STRUT, Alternator support 0 LW-3H0.75 BOLT, 5/-8 x 3/ long, hex. hd. dr. STD-90 WASHER, 3/ O.D. x 5/ I.D. x / thick AN-7 BOLT, 3/8- x -/ long, hex. hd. 3 STD-90 WASHER, 3/ O.D. x 5/ I.D. x / thick AR. STD-87 NUT, 3/8- slotted 5 STD-73 COTTER PIN, 3/3 dia. x 3/ long AN- BOLT, 3/8- x -53/ long, hex. hd., drilled end SHIM, -/8 O.D. x 3/3 I.D. x.005 thick AR 8 STD-90 WASHER, 3/ O.D. x 5/ I.D. x / fhick AR 9 STD-87 NUT, 3/8- slotted 0 STD-73 COTTER PIN, 3/3 dia. x 3/ long 5-3

44 O-50-AD5 PARTS CATALOG Figure 0. ALTERNATOR MOUNTING AND ATTACHING PARTS 5-

45 O-50-AD5 PARTS CATALOG OIL SUMP AND INDUCTION SYSTEM OIL SUMP ASSEMBLY AND OIL SUCTION SCREEN FIG. REF. PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 0B3 GASKET, Oil sump LW-390 SUMP ASSY., Oil 799 CONNECTION, Intake pipe 5C- STUD, /-0 x -3/8 long 3C-5 STUD, 5/-8 x -7/8 long 38-5 STUD, 3/8- x -7/8 long STD-73 INSERT, /-0 Helicoil x / long STD-8 WASHER, / plain STD- 0 WASHER, / lock, internal teeth LW-5-.3 BOLT, /-0 x -/8 long, hex. hd. LW BOLT, /-0 x.00 long, hex. hd. STD- NUT, /-0 plain STD-55 PLUG, /- NPT, Sq. hd., drilled STD-9 PLUG, / NPT, Allen hd. 708 SCREEN, Oil suction 0E GASKET, Annular..00 I.D. LW-55 PLUG, 5/8 hex. hd. x.00-0 thd. -

46 O-50-AD5 PARTS CATALOG Figure. OIL SUMP ASSEMBLY AND OIL SUCTION SCREEN -

47 O-50-AD5 PARTS CATALOG OIL SUMP AND INDUCTION SYSTEM INTAKE PIPE ASSEMBLY FIG. REF. PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY 7085 PIPE, Intake 903 HOSE, -3/ I.D. x -3/ O.D. x -3/ long 3 LW CLAMP, Hose 7973 GASKET, bolt flange, -3/ I.D FLANGE, Intake pipe, upper STD-8 WASHER, / plain 7 STD- 0 WASHER, / lock, internal teeth 8 LW-5-.5 BOLT, /-0 x -/ long, hex. hd. -3

48 O-50-AD5 PARTS CATALOG Figure. INTAKE PIPE ASSEMBLY -

49 O-50-AD5 PARTS CATALOG OIL SUMP AND INDUCTION SYSTEM CARBURETOR AND RELATED PARTS FIG. REF. 3 PART NUMBER DESCRIPTION QUANTITY PER ASSEMBLY LW STD-35 STD-75 5 STD-0 GASKET, Carburetor CARBURETOR, MA-5 (0-505) WASHER, 5/ plain WASHER, 5/ lock, internal teeth NUT, 5/-8 plain I -5

50 O-50-AD5 PARTS CATALOG 3 5 Figure 3. CARBURETOR AND RELATED PARTS -

51 O-50-AD5 PARTS CATALOG SERVICE KIT SECTION... SEAL AND GASKET SET Part No. Part Name Qty LW-7 LW-8 LW-795 0B3 LW-379 LW-0 LW-995 LW-58 LW-838 LW-8 LW-99 STD-3 0E STD-3 0E E A995 9-C KIT - SEAL AND GASKET SET LOCKPLATE, Shroud tube GASKET, Magneto GASKET, Oil filter adapter GASKET, Oil sump SEAL, Crankshaft oil SEAL, Tachometer drive oil SPRING, Shroud tube SEAL, Crankshaft LOCKPLATE, Crankshaft gear SEAL, Shroud tube GASKET, Exhaust flange RING, Internal retaining GASKET, Annular SEAL, Oil GASKET, Annular GASKET, Annular SEAL, Oil GASKET, Fuel pump GASKET, Fuel pump GASKET, Oil pressure housing GASKET, Accessory adapter GASKET, Magneto adapter GASKET, Carburetor GASKET, Accessory drive adapter GASKET, Fuel pump adapter SPACER GASKET, Accessory drive adapter SEAL, Shroud tube GASKET GASKET RING, Oil seal LOCKPLATE, Fuel pump idler gear GASKET, bolt flange GASKET, Governor GASKET, Oil level gage RING, Oil seal LOCKPLATE, Cam gear RING, Oil seal GASKET RING, Oil seal LOCKPLATE GASKET, Accessory housing "O" RING, Oil level gage 8 7-

52 O-50-AD5 PARTS CATALOG SERVICE KIT SECTION... SEAL AND GASKET SET (Continued) Part No. Part Name Qty KIT - SEAL AND GASKET SET (Continued) 708 "O" RING 7305 SEAL 7590 GASKET, Rocker box cover 750 GASKET 790 SEAL, Crankshaft oil 833 GASKET, Vacuum pump SERVICE KIT SECTION... CYLINDER, PISTON AND RING KIT Part No. Part Name Qty. 05K0 KIT - CYLINDER, PISTON AND RING ASSY. LW-7 CYLINDER ASSEMBLY LW-900 VALVE, Exhaust VALVE, Intake LW-800 SPRING, Valve, outer LW-795 SPRING, Valve, inner LW-0077 SEAT, Valve spring, upper intake LW-75 SEAT, Valve spring, upper exhaust 5 SEAT, Valve spring, lower intake LW-333 SEAT, Valve spring, lower exhaust 0009 KEY, Valve, intake 7C9 KEY, Valve, exhaust 7C938 CAP, Valve stem, exhaust PISTON 7 RING, Piston, compression H950 RING, Piston, oil regulating LW-078 PIN, Piston 088 PLUG, Piston pin 78 RING, Oil seal LW-8 SEAL, Shroud tube 7030 SEAL, Shroud tube 7590 GASKET, Rocker box cover 798 PLUG, Piston pin 77 GASKET, Exhaust 7973 GASKET, bolt flange LW-7 LOCKPLATE, Shroud tube SSP-99 TAG 7-

53 O-50-AD5 PARTS CATALOG SERVICE KIT SECTION... CRANKCASE ASSY. AND THRU STUD KIT Part No. Part Name Qty. E000-S-S E000-S 70 3C- 3C- STD-339 AN55B 03H AN55B 03H5 0 LW LW-3-. STD-35 STD-75 KIT, CRANKCASE ASSY. AND THRU STUD CRANKCASE ASSEMBLY THRU STUD STUD, 5/-8 x -3/ long STUD, 5/-8 x.00 long PLUG, /-7 NPT SET SCREW, No. 0-3 x / long SET SCREW, No. 0-3 x 5/ long PLUG, /8 pipe, oil pressure BOLT, 5/-8 x -3/ long BOLT, 5/-8 x -5/3 long WASHER, 5/ plain WASHER, 5/ lock, internal teeth SERVICE KIT SECTION... CRANKSHAFT & COUNTERWEIGHT ASSY. KIT Part No. Part Name Qty. 05K77 3E7 LW LW-80 KIT, CRANKSHAFT & COUNTERWEIGHT ASSY. CRANKSHAFT & BUSHING ASSY. COUNTERWEIGHT ASSY. ROLLER, Counterweight ROLLER, Counterweight WASHER, Dynamic counterweight RING, Internal retaining

54 O-50-AD5 PARTS CATALOG PART NO. NUMERICAL INDE PART NAME PAGE NO. PART NO. PART NAME PAGE NO. AN55B03H5 AN- AN-7 AN-3A AN8-8 LW LW LW LW-5-.3 LW-5-.3 LW-5-.3 LW-5-.5 LW-5-. LW LW LW-5S.50 LW LW-3-. LW-3-. LW LW-3H0.75 LW-3H0.88 LW-0077 LW-0 LW-050 LW-05 LW-85 LW-73 LW-750 LW-795 LW- 800 LW-997 LW-8 LW-7 LW-7 LW-55 LW-8 LW-707 LW-795 LW-89 LW-35 LW-333. LW-35 LW-3 Set Screw Bolt Bolt Bolt Nipple Bolt Bolt Bolt Bolt Bolt Bolt Bolt Bolt Bolt Bolt Bolt Bolt Bolt Bolt Bolt Bolt Bolt Seat Gear Carburetor Gear Assy. Shroud Tube Assy. Spring Conn. Rod Assy. Spring Spring Crankshaft Seal Nut Lockplate Cyl. & Head Assy. Plug Gasket Adapter Gasket Thrust Button Oil Filter Seat Bearing Cushion LW-3790 LW-379 LW-379 LW-3795 LW-388 LW-389 LW-390 LW-393 LW-0 LW-078 LW-0 LW-3 LW-75 LW-80 LW-995 LW-57 LW LW LW-7 LW-75 LW-7 LW-8085 LW-838 LW-8 LW-87 LW-900 LW-909 LW-97 LW-99 LW-930 MS08-8 MS083-D MS95-0 STD-8 STD-8 STD-8 STD-8 STD-8 STD-8 STD-9 STD-33 STD-33 STD-33 STD-35 Shaft Crankshaft Seal Stud Shaft Bearing Plug Sump Assy. Bushing Shaft Piston Pin Tachometer Seal Alternator Gage Assy. Ring Spring Fuel Pump Clamp Clamp Support Assy. Seat Bearing Spring Lockplate Seal Pin Exhaust Valve Gear Assy. Counterweight Assy. Gasket Camshaft Assy. Elbow Elbow "O" Ring Dowel

55 O-50-AD5 PARTS CATALOG NUMERICAL INDE (Continued) PART NAME Dowel Plug Dowel Nut Nut Nipple Cotter Pin Cotter Pin Plug Dowel Nut Nut Dowel Insert Plug Plug Insert Nut Nut Nut Nut Nut PAGE NO. PART NO STD-0 STD-0 STD- STD- STD- STD- STD- STD-0 STD-77 STD-77 STD-8 STD-88 STD-95 STD-090 STD-8 STD-9 STD-3 STD-7 5C-8 5C-0 5C- 5C- 3C- 3C- 3C- 3C-3 3C- 3C-5 3C- 3CD D B 08-B E PART NAME Nut Nut Nut Nut Nut Nut Nut Nut Pin Hose Screw Screw Nut Nut Plug Ring Bolt Stud Stud Stud Stud Stud Stud Stud Stud Stud Stud Stud Stud Stud Stud Stud Stud Stud Stud Nut Ball Plug Plug Plug Spark Plug Gasket Key 8- PART NO. STD-35 STD-35 STD-35 STD-35 STD-35 STD-35 STD-0 STD-0 STD-0 STD-0 STD- 0 STD-0 STD-75 STD-75 STD-75 STD-75 STD-75 STD-75 STD-75 STD-5 STD-55 STD-557 STD-59 STD-59 STD-78 STD-78 STD-8 STD-90 STD-73 STD-73 STD-78 STD-798 STD-87 STD-87 STD- 05 STD-73 STD- STD-339 STD-353 STD- 09 STD-0 STD-0 STD-0 STD-0 PAGE NO

56 O-50-AD5 PARTS CATALOG PART NO. NUMERICAL INDE (Continued) PART NAME PAGE NO. PART NO. PART NAME PAGE NO A Gasket Cover Lifting Strap Spring Gasket Cover Exhaust Flange Plunger Valve Guide, Intake Gasket Plug Seat Gasket Bushing Insert Bushing Adapter Assy. Ball Bearing Spring Tube Assy. Tube Assy. Cover Gasket Hose Dowel Seal Gasket Gasket Screen Intake Pipe Ring Hook Retainer Plug Gear Assy. Gear Assy. Connection Tube Assy. Bushing Gasket Gasket Seat, Intake S S 7557-S Seat, Exhaust Ring Bushing Bushing Piston Pin Plug Elbow Cover Starter Ring Gear Roller Body Roller Gear Assy. Breather Fitting Coupling Coupling Thrust Thrust Thrust Thrust Flange Lockplate Bushing Gasket Intake Valve O Ring Ring Bushing Shaft Spacer Bolt Piston Baffle Assy. Link Bushing Bushing Extension Gasket Spacer Shaft Assy. Stud Gasket Shim Spring Valve Assy

57 O-50-AD5 PARTS CATALOG NUMERICAL INDE (Continued) PART NO. PART NAME PAGE NO. PART NO. PART NAME PAGE NO L8 0P K93-S 0A995 0B3 0E E E A97 07F38 E000-S A9770 3E7 3S97 H950 5B39 5F F F F R9 7C938 7C9 7F9357 8A9 8D335 8M9389 C B05 3C9553 3B98 37A E LP-OSCNN LR37SCNN M95 7U008 7U009 Oil Filter Base Assy. Bushing Spacer Plunger Assy. Body Assy. Thrust Magneto Attaching Impeller Kit Oil Seal Gasket Gasket Gasket Gasket Bracket Strut Crankcase Assy. Engine Mtg. Bracket Crk'shft & Bush. Assy. Gear Ring Socket Rod Assy. Rod Assy. Rod Assy. Rod Assy. Valve Guide, Exhaust Cap Key Rocker Assy. Bearing Bearing Bearing Housing Assy. Starter Alternator Assy. Pulley Belt Valve Assy. Magneto Magneto Clamp Harness Assy. Harness Assy