A-2 Ball Bearing Crankshaft Thrust P/N B-550
A-3 Excessive Cylinder Wear
A-4 Valve Springs
A-5 Relocation of all Propellers in the Hubs
A-6 Valve Spring P/N 7741
A-7 Service Memorandum to Owners of Airplanes Powered by Warner Super-Scarab 145 HP Engines
A-8 Valve Springs
A-9 Replacement of Link Rod Bolts
A-10 Replacement of Exhaust Valve Springs
A-11 Periodic Inspection of Crankshafts on
125 HP Engines
A-12 Valve-Carburetor Heat Control Assembly No. 8290 - Modification of Linkage
A-13 Pistons, Exhaust Valve, Cylinder, Link Rod
A-14 Spark Plugs-Installation, Inspection, Maintenance, and Overhaul
A-15 Cylinder Attaching Studs - Proper Maintenance, Inspection, and Assembly Procedure
A-16 Carburetor Heat Control Valve Assembly No. 7720 and 7989 - Drilling of Drain Hole
to Eliminate Fire Hazards
A-17 Replacement of Cylinder Hold-Down Stud, Gasket between Cylinder Barrel and Crankcase
A-18 Recognition of Reinforced Taper Crankshaft
and Availability of New Heavier Stem Exhaust Valve
M-9 Guide-Cam Follower
M-10 Valve Springs for New Engines
M-11 Master Connecting Rod Final Assembly
Part No. 7012-B
M-12 Propeller Installation on all Super Scarab Engines
M-13 On Super Scarab Engines SS-400E to SS-499E, inclusive, Piston Assemby No. 7745 is used.
M-14 Preparing Engines for Export Shipment
M-15 Piston Assembly using 4 rings
M-16 Defective Parts Replacement by Manufacturer
M-17 Suitable Spacers
M-18 Part No. 5012 Connecting Rod-Final Assembly Master is now superseded by Part No. 5099 Connecting Rod-Final Assembly
M-19 Steel ring attached to Part No. 7252, Thrust Bearing Cover has become worn
M-20 Checking Valve Springs
M-21 Part No. 7610 Exhaust Valve on Super Scarab Series 40 and 50, 160 hp Engines
AD 51-04-02 Cylinder Holddown Studs
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