To Next PageTo Next Page
Need help?Do you have a question about the Tecumseh HS40 - 50 and is the answer not in the manual?
Locating and identifying Tecumseh engine model, specification, and serial numbers on the engine.
Understanding the designation of letters and numbers in a Tecumseh engine model number.
Identification of new short blocks and transferring original model numbers for parts identification.
Recommendations for using fresh, clean unleaded gasoline and handling reformulated/oxygenated fuels.
Function of the air cleaner in eliminating dust and dirt to protect engine components.
How air is filtered through pre-cleaners, flocked screens, and paper or polyurethane elements.
Description of air cleaner parts including cover, filter element, and polyurethane wrap.
Service recommendations for polyurethane elements (cleaning/oiling) and paper elements (replacement).
Overview of Tecumseh's float and diaphragm type carburetors and their functions.
Explanation of carburetor operation during choke, idle, intermediate, and high-speed engine states.
How impulse fuel pumps are mounted, operated by crankcase impulses, and actuate the diaphragm.
Function of the float in maintaining fuel volume in the carburetor bowl via a needle valve.
Introduction to governor assembly and linkage for maintaining constant engine RPM.
How governor weights and spool regulate throttle opening based on engine speed.
Diagnosing engine problems suspected to be caused by the governor system.
Procedures for removing and replacing governor spool, gear, and shaft.
Types of rewind starters and their engagement mechanisms with the flywheel.
How the starter rope, pulley, dogs, and retainer interact to engage the starter cup.
Procedures for diagnosing and repairing starter-related problems.
Disassembly and assembly procedures for stylized and stamped steel rewind starters.
Overview of the three main elements of the electrical system: battery, starting, and charging circuits.
How the starter switch, armature, and pinion engage to crank the engine.
How the flywheel magnets induce current in the alternator coil and generate an AC waveform.
Using diodes or rectifiers to convert AC signals into DC for battery charging.
Methods for meeting compliance standards by stopping the engine/blade within three seconds.
How the brake lever forces a pad against the flywheel, actuating the ignition kill switch.
Operation of the brake system when the pad contacts the underside of the flywheel.
Operation of the brake system when the pad contacts the inside edge of the flywheel.
Overview of solid state (CDI) and magneto ignition systems.
How magnets, coils, and points (or SCRs) trigger spark for ignition.
Identification of parts in a magneto ignition system including flywheel, coil, and points.
Flow chart for diagnosing engine starting or running issues related to ignition.
Covers cylinder block, piston, crankshaft, camshaft, valves, and lubrication systems.
Explanation of the four piston strokes: intake, compression, power, and exhaust.
Description of splash and positive displacement oil systems for engine lubrication.
Detailed breakdown of engine parts including cylinder block, piston, rings, and crankshaft.
Torque specifications for replacing engine components after disassembly.
Technical specifications for standard point ignition engines.
Engine specifications for solid state and external ignition models.
Table for converting decimal measurements to fractional equivalents.
List of available handbooks covering engine and transaxle repair.
List of special booklets for carburetor, engine failure, and ignition system analysis.
Booklets detailing test procedures for electrical components using specific testers.
Locating and identifying Tecumseh engine model, specification, and serial numbers on the engine.
Understanding the designation of letters and numbers in a Tecumseh engine model number.
Identification of new short blocks and transferring original model numbers for parts identification.
Recommendations for using fresh, clean unleaded gasoline and handling reformulated/oxygenated fuels.
Function of the air cleaner in eliminating dust and dirt to protect engine components.
How air is filtered through pre-cleaners, flocked screens, and paper or polyurethane elements.
Description of air cleaner parts including cover, filter element, and polyurethane wrap.
Service recommendations for polyurethane elements (cleaning/oiling) and paper elements (replacement).
Overview of Tecumseh's float and diaphragm type carburetors and their functions.
Explanation of carburetor operation during choke, idle, intermediate, and high-speed engine states.
How impulse fuel pumps are mounted, operated by crankcase impulses, and actuate the diaphragm.
Function of the float in maintaining fuel volume in the carburetor bowl via a needle valve.
Introduction to governor assembly and linkage for maintaining constant engine RPM.
How governor weights and spool regulate throttle opening based on engine speed.
Diagnosing engine problems suspected to be caused by the governor system.
Procedures for removing and replacing governor spool, gear, and shaft.
Types of rewind starters and their engagement mechanisms with the flywheel.
How the starter rope, pulley, dogs, and retainer interact to engage the starter cup.
Procedures for diagnosing and repairing starter-related problems.
Disassembly and assembly procedures for stylized and stamped steel rewind starters.
Overview of the three main elements of the electrical system: battery, starting, and charging circuits.
How the starter switch, armature, and pinion engage to crank the engine.
How the flywheel magnets induce current in the alternator coil and generate an AC waveform.
Using diodes or rectifiers to convert AC signals into DC for battery charging.
Methods for meeting compliance standards by stopping the engine/blade within three seconds.
How the brake lever forces a pad against the flywheel, actuating the ignition kill switch.
Operation of the brake system when the pad contacts the underside of the flywheel.
Operation of the brake system when the pad contacts the inside edge of the flywheel.
Overview of solid state (CDI) and magneto ignition systems.
How magnets, coils, and points (or SCRs) trigger spark for ignition.
Identification of parts in a magneto ignition system including flywheel, coil, and points.
Flow chart for diagnosing engine starting or running issues related to ignition.
Covers cylinder block, piston, crankshaft, camshaft, valves, and lubrication systems.
Explanation of the four piston strokes: intake, compression, power, and exhaust.
Description of splash and positive displacement oil systems for engine lubrication.
Detailed breakdown of engine parts including cylinder block, piston, rings, and crankshaft.
Torque specifications for replacing engine components after disassembly.
Technical specifications for standard point ignition engines.
Engine specifications for solid state and external ignition models.
Table for converting decimal measurements to fractional equivalents.
List of available handbooks covering engine and transaxle repair.
List of special booklets for carburetor, engine failure, and ignition system analysis.
Booklets detailing test procedures for electrical components using specific testers.
General
