The Aviation DataBase: Service Information: Franklin Engine
The Aviation DataBase®
Complete Aviation Regulatory Library
Sept. 11 Sept. 11
DataBases updated: Jun 5th, 2025
Home Products Library Support Account Login Contact
Service Bulletins
NameRevisionLangSubjectDate
en Use of Gasoline with High Lead Content02/16/1942
en Advance Information Covering Engines 6A4-150-B31 and 6A4-150-B3 Used in Stinson 150 Voyager02/08/1946
en Generator Gear Absorber and Hub for Stinson Voyager 150 Aircraft04/08/1946
en Oil Cooler Reinforcements for Model 6A4-150-B3 Engines05/21/1946
en Effect of Primer on Engine Operation on Model 6A4-150-B3 Engines as Used in Stinson 150 Voyager05/24/1946
en Diagram of Installation of High Tension Ignition Wires as Used on 6A4-150-B3 Franklin Engines06/04/1946
en 25 Hour Check on Oil Cooler Reinforcement Tension Band Nuts - Model 6A4-150-B3 Engines08/15/1946
en Oil Seepage at Valve Rocker Covers and Lifter Rod Tube Packings on 6A4-150-B3 Engines10/14/1946
en Auto-Lite Spark Plugs as Used on the Franklin Models 6A-215-B8F and B9F Engines in the Republic Seabee11/21/1946
en Oil Seepage at Lifter Rod Tube Packings on Model 6A4-150-B3 Franklin Engines11/21/1946
revised en Loose Plugs in Inlet Manifolds on 6A-215-B8F & B9F Engines09/21/1953
en Suggestions for Cold Weather Operation on Franklin Engines Model 6A4-150-B3 and 6A4-150-B3101/14/1947
en Engine Mount Bold Lock Washers fro 6A-215-B8F Engines01/17/1947
en Fuel Pump Installation on 6A4-150-B3 and B31 Engines as Used on Bellanca Cruisair02/08/1947
en Battery and Magneto Ignition on Franklin Engines in Seabee Installation03/27/1947
en Installation of Engine Cooling Fan and Starter Gear Assembly on Franklin Model 6A8-215-B8F and B9F Engines as Used in Seabee Installations04/10/1947
en Fuel Consumption Chart for Franklin 6A8-215-B8F and B9F Engines at a 75% Power Cruise Condition04/10/1947
en Oil Level in Model 6A8-215-B8F and B9F Engines as Used in Republic Seabee Installation04/30/1947
en Bendix-Scintilla Magnetos Model S6LN-21 as Used on Franklin Engine Model 6A4-150-B3 and 6A4-165-B3 in Stinson Voyagers05/27/1947
en Chafing of Balance Pipe on Model 6V4-178-B3 and B32 and 0-335-1 and 0-335-3 Engines Used on Bell Helicopter Installation05/28/1947
en Revised Attachment of Fan and Starter Gear Assembly on Franklin Models 6A8-215-B8F and B9F as Used in Seabee Installation06/11/1947
revised en Revised Attachment of Fan and Starter Gear Assembly on Franklin Models 6A8-215-B8F and B9F as Used in Seabee Installation09/21/1953
en Checking Floating Oil Screen on Franklin Engines Model 6A8-215-B8F and B9F as Used in Seabee Installation06/11/1947
en Replacement of Float Type Oil Inlet Screen on Franklin Engines Model 6A8-215-B8F and B9F up to and Including Engine #2406510/22/1947
revised en Replacement of Float Type Oil Inlet Screen on Franklin Engines Model 6A8-215-B8F and B9F up to and Including Engine #2406509/22/1953
en Conversion of Early Model 6A8-215-B8F Franklin Engines as Used in the Seabee Installation to Incorporate the Floating Bearing Assembly at the Propeller End and Large Oil Pump and By-Pass Plate Assembly10/28/1947
revised en Conversion of Early Model 6A8-215-B8F Franklin Engines as Used in the Seabee Installation to Incorporate the Floating Bearing Assembly at the Propeller End and Large Oil Pump and By-Pass Plate Assembly09/22/1953
en Accelerator Pump Kit, Part A666-581, for Engines with the Marvel-Schebler MA-3-SPA Carburetor10/27/1947
revised en Drilling Moisture Drain Holes in Scintilla-Magneto Breaker Covers06/01/1955
en Fuel and Lubricating Oil as Used in Franklin Engines12/10/1947
en Rocker Arm Pin Replacement in Fuel Pump as Used on Model 6V4-178-B3 and B32 and 0-335-3 Engines in Bell Helicopter Installation Covering Fuel Pump Aircooled Motors, Inc., Part No 17940, AC Part No 153909601/29/1948
revised en Magneto Shock Absorber Drives on Franklin Engines 6A4-150-B3, 6A4-150-B31 and 6A4-165-B303/02/1948
en Fuel Pumps, Aircooled Motors, Inc. Part #14876 and #14877 as Used on Models 6A8-215-B8F and B9F Franklin Engines in the Republic Seabee Installation06/14/1948
en Cylinders Used on Model 6A4-150-B3 and B31 Engines in the Early 11,000 Serial Number Series on Stinson and Bellanca Installations08/17/1948
revised en Cylinders Used on Model 6A4-150-B3 and B31 Engines in the Early 11,000 Serial Number Series on Stinson and Bellanca Installations09/22/1953
revised en Ground Spring and Ground Wire Assembly as Used on Bendix-Scintilla Magnetos on Franklin Engines06/01/1955
en Fuel Pumps and Drain Lines for Model 6A8-215-B8F and B9F Franklin Engines as Used in Republic Seabee Installation11/22/1948
revised en Fuel Pumps and Drain Lines for Model 6A8-215-B8F and B9F Franklin Engines as Used in Republic Seabee Installation09/22/1953
revised en Carburetor Distributor Zones as Used on 6A4-150 and 6A4-165 Engines06/01/1955
revised en Inspection of Oil Pump Gears on Franklin 6V4-178-B32, B33, 6V4-200-32, 0-335-2, 0-335-3, 0-335-4, YO-335-5, 0-335-5, YO-335-6 & 0-335-6 Engines11/01/1951
revised en Magnaflux Acceptance Standard for Connecting Rods for 6A4-150, 6A4-165, 6V4-178 and 6V4-200 Engines06/01/1955
en Connecting Rod Bolt Nut Torque Limit09/15/1953
B en Connecting Rod Bolt Nut Torque Limit05/25/1960
revised en Cylinder Assembly - Inspection of Hold-Down Washer Spot Face Area06/01/1955
en Connecting Rod Modification01/10/1956
en Removal of a Specific Lot of P/N 19751 Connecting Rods from Use05/15/1963
en Inspection of Carburetor Zone for Cracks12/01/1964
en Index to Franklin Service Bulletins05/01/1956
Service Instructions
NameRevisionLangSubjectDate
en Inspection for Replacement of Connecting Rod Assembly05/25/1960
Service Letters
NameRevisionLangSubjectDate
A en Recommended Time Between Overhaul (TBO)02/28/1971
Service News
NameRevisionLangSubjectDate
en Crankshaft and Camshaft Gear Timing Marks06/24/1949
revised en Crankshaft and Camshaft Gear Timing Marks04/15/1957
en Franklin Aircraft Engine Cylinder Reconditioning Models 6A4-150, 6A4-165, 6V4-178 and 6A8-21511/01/1949
revised en Factory Major Overhaul and Franklin Engine Overhaul Exchange Program06/02/1952
en Crankcase for Model 6A4-165-B3 Franklin Engine06/03/1952
revised en Crankcase for Model 6A4-165-B3 Franklin Engine11/09/1964
en Return of Franklin Engines and Parts to the Factory02/28/1951
en Exhaust Valves as Used in Franklin Model 6A4-150, 6A4-165, 6V4-178, 6V4-200 and 6A8-215 Engines03/08/1951
en Recommended Procedure for Replacing the Name Plate on Franklin Engines05/10/1951
en Modification of Franklin Model 6A4-150-B3 Engines to Provide for Use of an Oil Control Propeller06/05/1952
revised en Use of Shell T.O.P. Concentrate in 6A4-150, 6A4-165, 6V4-178, 6V4-200, 6A4-200 and 6A8-215 Series Engines01/25/1954
revised en Regrinding of Nitrided Crankshafts12/16/1955
revised en Recommended Special Tools for Franklin 6A4-150-B3, 6A4-165-B3, 6V4-178-B32 & B33, 6V4-200-C32 & C33 Engines02/08/1956
en Engine Overspeeding02/01/1954
en Motor Mount Bolts on 6A8-215-B8F Engines11/06/1946
revised en Inspection of Throttle Body to Bowl Gaskets on Marvel-Schebler MA-4-5 Carburetors on 6A4-165, 6V4-178, 6V4-200 and 6A8-215 Engines03/01/1955
en Oil Cooler Thermostat for Franklin Models 6A4-150-B3 and 6A4-165-B3 Engines12/21/1954
revised en Valve Lifters for 6A4-165-B3, 6V4-178-B32 & C33, 6V4-200-C32 & C33 Engines04/12/1955
revised en Approved Spark Plugs03/19/1956
revised en Approved Changes & Modifications03/05/1959
en Index to Franklin Service News05/01/1956
Miscellaneous
NameRevisionLangSubjectDate
en Overhaul Changes: Connecting Rod Modification
en Operators Handbooks & Parts Catalog: 4AC-199