Franklin Overhaul Manual - Republic RC-3 Seabee

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Service Instructions

FRANKLIN AIRCRAFT ENGINES

MODEL 6A8-215-B8F & B9F ENGINE

INSPECTION, MAINTENANCE AND

OVERHAUL INSTRUCTIONS

AIRCOOLED MOTORS

SYRACUSE 8, NEW YORK

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TABLE OF CONTENTS

SECTION

I II III IV V VI VII VIII IX X XI XII XIII XIV XV XVI XVII XVIII XIX XX XXI XXII XXIII XXIV XXV XXVI XXVII XXVIII XXIX XXX

Introduction ....................................................................... Warranty ........................................................................... Replacement Parts and Shipping Instructions .................. Engine Specifications........................................................ Table of Limits and Tolerance ........................................... Recommended Tightening Torque Values........................ Periodic Inspection and Overhaul Periods ........................ Engine Lubrication ? General............................................ Crankcase ......................................................................... Crankshaft......................................................................... Camshaft Assembly .......................................................... Timing Gear Case ............................................................. Connecting Rod ................................................................ Piston, Piston Pin and Rings ............................................. Cylinder Assembly ............................................................ Valves and Valve Springs ................................................. Valve Actuating Mechanism.............................................. Propeller Shaft and Propeller Shaft Housing Assembly .... Fan, Starter Gear and Generator Drive............................. Lubrication System ? Details of Units................................ Inlet Manifold System........................................................ Ignition and Tachometer Drives ........................................ Ignition System ? Model 6A8 ? 215 ? B8F ........................ Ignition System ? Model 6A8 ? 215 ? B9F ........................ Fuel Pumps....................................................................... Carburetion ....................................................................... Generator and Voltage Regulator ..................................... Starting Motor ................................................................... 6A8 ?215 ? B8F and B9F Engine Assembly ..................... Engine Testing ..................................................................

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3 4 6 6 8 11 12 13 15 16 17 18 18 19 20 22 22 26 28 29 31 32 35 39 41 42 45 45 45 48

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I ? INTRODUCTION

Years of Franklin engineering experience plus the highest quality in materials and workmanship, together with the most modern manufacturing methods are back of every Franklin engine shipped from our factory. It is the purpose of this manual to furnish ready reference and practical information on the operation, inspection, preventive maintenance and complete overhaul of the model 6A8-215-B8F and 6A8-215-B9F Franklin engines and their accessories. The name and data plate located on top of the propeller shaft housing at the crankcase and indicates the engine model. An effort has been made to arrange the material in the manual so that the description, function, inspection and repair of the component parts of the engine and its accessories are completely covered in their individual sections. In referring to locations on the engine, it is assumed that the observer's position is at the fan end of the engine looking toward the propeller end. Hence, the propeller end will be referred to as the front of the engine irrespective of the position the engine occupies in the aircraft. Cylinders number 1, 3 and 5 are on the left side of the engine and cylinders number 2, 4 and 6 are on the right side of the engine. It is recommended on the interest of safety, operating economy and maximum service life of the engine that the operation limits, inspections, tolerances, maintenance and overhaul instructions and methods be strictly adhered to. It is also recommended that existing instructions of the various aircraft, propeller and accessory manufacturers regarding the servicing of their products be rigidly followed. Additional or revised information, together with the latest service bulletins, will be issued as they become available. Please keep us advised of your current mailing address to insure prompt receipt of this material. To insure that your best interests be served and satisfaction be guaranteed, we recommend that replacements be made with genuine Franklin parts only. Please address all service inquiries or comments to Service Division, Aircooled Motors, Inc., Syracuse 8, New York. They will receive prompt and courteous attention.

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II ? WARRANTY Aircooled Motors, Inc. warrants each new Franklin engine or new part manufactured by it against defects in material or workmanship under normal use, but its obligation under this warranty is specifically limited to replacing or repairing at its factory any such engine or part which shall, within 90 days after delivery thereof to the original purchaser and prior to 50 hours of operation, be returned to Aircooled Motors, Inc., with its permission, transportation charges prepaid, and which upon examination by Aircooled Motors, Inc., is determined by Aircooled Motors, Inc., to be defective. This warranty shall not apply to any such engine or parts which have been repaired or altered outside Aircooled Motors, Inc. factory in any way so as to affect, in its judgment, its operation, or which have been subjected to misuse, neglect, improper maintenance or accident, or which shall have been operated at a speed exceeding the factory rated speed. Aircooled Motors, Inc. makes no warranty with respect to ignition apparatus, carburetors, instruments, trade accessories, or other equipment which it does not itself build or manufacture inasmuch as such equipment is usually guaranteed by the respective manufacturers thereof. The foregoing is the exclusive warranty made by Aircooled Motors, Inc. There are no other warranties expressed or implied, in fact or in law, made by Aircooled Motors, Inc.

AIRCOOLED MOTORS, INC. Syracuse 8, New York

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