User manual TECUMSEH TNT100-120

[. . . ] TECUMSEH TECHNICIAN'S HANDBOOK This manual covers engine models: ECV100 - 120, H22 - 80, HH40 - 70, HHM80, HM70 - 100, HMSK70 - 110, HMXL70, HS40 - 50, HSK30 - 70, HSSK40 - 50, HT30 - 35, HXL35, LAV30 - 50, LEV80 - 120, TNT100 - 120, TVM125 - 220, TVXL170 - 220, TVS75 - 120, TVXL105 - 115, V40 - 80, VH40 - 70, V60 - 70, VM70 - 100 Model numbers are located on the engine shroud. Main Menu 3 TO 11 HP 4-CYCLE L-HEAD ENGINES Main Menu CONTENTS CHAPTER 1 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ENGINE IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 INTERPRETATION OF MODEL NUMBER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SHORT BLOCKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 8 7 9 10 44 Main Menu BASIC CHECKS Before going into extensive checks, be sure to perform the more basic checks first, such as: 1. Corroded or loose terminals and connections, or wrong connections. A wire "grounding out" in the system. Operator presence system functioning properly. * *NOTE: ALL LAWN AND GARDEN TRACTORS BUILT AFTER JULY OF 1987 ARE REQUIRED TO HAVE AN OPERATOR PRESENCE SYSTEM AND MANY CAME EQUIPPED WITH SUCH A SYSTEM PRIOR TO THIS DATE. IF THE TRACTOR IS "CUTTING OUT" OR WILL NOT START, THIS IS AN AREA THAT SHOULD BE CHECKED OUT. 45 Main Menu TROUBLESHOOTING ELECTRICAL STARTER CIRCUIT FLOW CHART Starter will not turn Intermittent starter operation Starter turns at low rpms or stalls under load NO Is there power at the power source? YES Repair or replace power source NO Is power supplied to the starter terminal? YES Check wiring, connections, safety switches, starter switch NO Isolate engine from the equipment, does engine turn over? YES Check starter for binding brushes, worn brushes, dirty or oily commutator NO Remove spark plug, does engine turn over freely? YES Repair or replace equipment causing excessive loading YES Internal engine failure or flywheel interference NO Reinstall spark plug, does engine bind on compression stroke? YES Check valve lash. Does the engine turn over without binding now? NO Repair or replace electric starter Internal engine failure, repair or replace engine 46 Main Menu TROUBLESHOOTING ELECTRICAL CHARGING CIRCUIT FLOW CHART Identify the charging system used by model and specification number or visually check the electrical plug Consult the Technician's Handbook or Electrical Troubleshooting booklet for test procedure for the charging system used Test for either AC or DC voltage as directed at the proper engine RPM NO Is the voltage greater than or equal to the minimum value? YES NO Is AC voltage before diode or YES rectifier greater than the minimum value? Check wiring, switches, or ammeter for breaks, shorts Alternator coil failure, replace coil assy. Check diodes, replace if no continuity exists or if continuity exists reversing test leads Check fuses, replace as necessary Check switches, wiring, or lights for shorts 47 Main Menu TESTING PROCEDURE STARTING CIRCUIT 1. Check the power source using an electrical tester and follow the testers recommended procedure. Make sure the battery meets the minimum battery voltage requirements found in the original equipment manufacturer's service manual. Check the electric starter terminal for the required voltage (12v D. C. CAUTION: FOLLOW ALL SAFETY PRECAUTIONS WHEN TESTING FOR A. C. Check wiring, connections, fuses, ignition or starter switch, safety switches, or solenoid for continuity using a ohmmeter or a continuity light. Remove all equipment loads from the engine. Take off all drive belts, chains, and couplers to isolate the engine from the equipment it is powering. Try to turn the engine over using the recoil assembly if equipped. If the engine doesn't turn over, a mechanical binding may be the cause. Check for proper lubrication (oil level and viscosity), starter gear and flywheel ring gear interference. If no problem is discovered, the problem is an internal failure. If the engine binds only on the compression stroke, check the engine valve clearance per the specification table in Chapter 10. If the valve clearance is within the specifications, the camshaft (compression release) may require replacement. Valve clearance not within the listed specifications will require either resetting or grinding the valve stems to obtain the proper clearance. If the engine turns over freely, the electric starter should be disassembled and checked. If the preceding steps fail to correct the problem, the engine will require disassembly to find the mechanical failure. [. . . ] 1. 002", 1. 052" and 1. 050") for V70, VM70-100, H70, HM70-100, V50-70, H50-70, HS40-50, LAV40-50, TVS105-120, TNT120 670293 Includes 670268 & 670269 (I. D. . 875" and . 935") H30-35, LAV30-35, TNT100, TVS75-90, ECV90-100 670294 Includes 670273 & 670274 (I. D. . 680" and 1. 005") AH520 & AH600 with one piece oil seal 670330 OHV13. 5-17 w/ 1-1/2" extended camshaft 670335 HM70-100 PTO & Magneto w/dia. of 1. 1870"-1. 1875" 670336 HM70-100 w/ 1-1/8" crankshaft 670337 OHH engines, use w/ tool 670265 Use tool 670266 No. [. . . ]