SE ED CONTENTS 1 Page Corvair 10100 and 10500 Series 6 1 Engine Tune Up 6 1 Engine Mechanical 6 1 coRVA1R 10 100 ENGINI I Page General Description 6 1 Tune up Chart 6 2 Mechanical Checks and Adjustments 6 1 Remove Spark Plugs 6 1 Test Compression 6 3 Clean and Inspect Spark Plugs 6 3 Install Spark Plugs 6 3 Service Ignition System 6 3 Service Battery and Battery Cables 6 4 Service Blower Belt And Delcotron g g Service Fuel Line and Fuel Filter 6 5 Service Air Cleaner 6 5 Service Crankcase Ventilation 6 5 Carburetor Synchronization 6 5 Mechanical Adjustments 6 5 Instrument Check out 6 6 Instrument Hook Up 6 6 GENERAL The engine tune up has become increasingly important to the modern automotive engine with its vastly improved power and performance With the higher compression ratios improved electrical systems and other advances in design today s engines have become more sensitive to usage and operating conditions all of which have a decided effect on power and performance Since the modern engine is admittedly more temperamental and sensitive to adjustments some means must be devised to put back into the engine the standard of performance and economy of which it is capable Since it is seldom advisable to attempt an improvement in performance by correction of one or two items only time will normally be saved and more lasting results assured if the serviceman will follow a definite and thorough procedure of analysis and correction of all items affecting power performance and economy The tune up will be performed in three parts The first part will consist of visual and mechanical checks and adjustments the second part will consist of mechaniMECHANICAL CHECI Remove Spark Plugs 1 Remove spare tire 2 Remove air cleaner assembly 3 Disconnect spark plug wires at spark plugs 4 Remove any foreign matter from around spark plugs by blowing out with compressed air then loosen all plugs one turn TION 6 MINE F THIS SECTION Corvair 10700 Series and R P O L63 Page 4 x 1 Carburetors 6 56 Corvair with Turbocharger 6 59 Special Tools 6 62 AND 10500 SERIES I TUNE UP NDEX Page Ignition Dwell g 6 Ignition Timing g g Carburetor Synchronization 6 6 Vacuum Advance 6 7 Idle Speed and Mixture Adjustment g 7 Fast Idle Cam Adjustment 6 7 Choke Vacuum Diaphragm Adjustment 6 q Vapor Vent Adjustment 6 7 Choke Adjustment 6 7 Choke Unloader Adjustment 6 q Final Adjustment 6 7 Additional Checks 6 8 Cylinder Balance Test 6 Starting Circuit Checks 6 9 Charging Circuit Checks 6 9 Ignition Circuit Checks 6 9 Fuel Pump Tests 6 g DESCRIPTION Cal synchronization of carburetors while the third part will consist of an instrument checkout that can be performed with any one of the modern compact units of service equipment available for this purpose Always follow the instructions provided by the manufacturer of the particular equipment to be used Additional checks and adjustments are included in the latter part of this section for use as required Many of these operations would normally be used to isolate and correct trouble located during the tune up Where conditions are uncovered requiring major corrective action refer to the appropriate section of this manual for detailed service information All operations included herein will be performed on the vehicle Illustrations depicting bench operations have been employed for convenience only and are intended only to clarify the operations which will be performed on the vehicle Since it is impractical to illustrate all possible installations that may be encountered only a typical installation will be used to illustrate the point in question IS AND ADJUSTMENTS 5 Start engine and accelerate to 1000 rpm to blow out loosened carbon NOTE Clearing out carbon in this manner is important in preventing false compression readings due to chips of carbon being lodged under the valves C04VAR 5lIOr MANUAL