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Information on locating model, serial, and date of manufacture (DOM) stamped on the engine.
Explanation of model number designations indicating engine type, shaft orientation, and frame size.
Identification of new short blocks by tag (SBH/SBV) and transfer of original model numbers.
Recommendation for using fresh, clean unleaded regular gasoline for optimal engine life.
Details the function of the air cleaner in removing dust and dirt to protect engine components.
Explains how the air cleaner cover, pre-cleaner, and filter element work together to clean air.
Lists and describes parts of the air cleaner assembly, including cover, elements, and seals.
Guides on checking the air cleaner for unsatisfactory engine performance like smoking or power loss.
Step-by-step guide for disassembling the air cleaner assembly for cleaning or replacement.
Instructions for cleaning and oiling polyurethane filter elements to restore performance.
States that paper-type filter elements can only be serviced by replacement, not cleaning.
Explains the two main types of Tecumseh carburetors: float and diaphragm, and their basic functions.
Describes how carburetors function at different engine speeds (choke, idle, intermediate, high).
Details the function and types of fuel primers used to supply a charge of air to the carburetor.
Identifies dual system carburetors by their primer bulb and lack of adjustment needles.
Describes Series 1 carburetors used on various engines, noting venturi size and adjustment types.
Explains identification of Series 3 and 4 carburetors based on bosses and throttle plate screws.
Highlights unique features of diaphragm carburetors, including tiltability and lack of fuel bowl.
Compares the Dellorto carburetor to the dual system type, noting its lack of adjustments.
Steps for testing the starting circuit, including checks for spark and power at the starter.
Testing various Tecumseh charging systems using voltmeter readings at different RPMs.
Details pre-setting and adjusting mixture screws, noting differences for emission-grade carburetors.
Step-by-step instructions for disassembling float-style carburetors, noting component removal.
Inspecting throttle and choke levers, shafts, and carburetor body for wear or damage.
Inspecting the idle and high speed mixture needle tips and tapered surfaces for damage.
Explains the function of the retaining nut and its passages, and proper torque for reinstallation.
Instructions for cleaning and inspecting the fuel bowl, float, needle, and seat for wear or damage.
Inspecting diaphragms, gaskets, and primer bulbs for cracks, tears, or brittleness.
Instructions for installing new welch plugs after carburetor cleaning, ensuring proper sealing.
Guidance on reassembling the throttle shaft and plate, ensuring correct positioning and using new screws.
Instructions for assembling the choke shaft and plate, checking for free movement and proper operation.
Steps for installing the fuel inlet fitting squarely into the carburetor body, ensuring proper sealing.
Explains governor assembly and linkage, and the governor's function in maintaining constant RPM.
Describes how governor weights move outward with speed, affecting the throttle linkage.
Diagrams illustrating various styles of internal governor components like spool, gear, and shaft.
Outlines engine problems suspected to be governor-related, such as hunting or overspeeding.
Procedure for adjusting the governor by loosening and tightening the clamp on the governor lever.
Specific governor adjustment steps for short block installations built before 1977.
Adjusting engine speed for snap-in style speed controls using bendable tabs and an adjustment tool.
Information on rewind starters used on vertical and horizontal shaft engines, and how they engage the flywheel.
Describes the process of pulling the starter rope, engaging the starter dog, and retracting the rope.
Diagrams showing components of rewind starters, including handle, pulley, dog spring, and retainer.
Procedures for removing and diagnosing starter problems, inspecting components for wear or breakage.
Guidance on replacing starter rope, including correct part numbers and diameter conversions.
Instructions for disassembling stylized and stamped steel rewind starters, including removing the center pin.
Steps for disassembling rewind starters with plastic retainers, including removing the retainer legs.
Instructions for disassembling standard stamped steel and cast aluminum starters.
Steps for assembling the rewind spring and keeper, pulley, and retainer into the starter housing.
Instructions for disassembling vertical pull starters with horizontal engagement.
Instructions for disassembling vertical pull starters with vertical engagement, including spring capsule removal.
Overview of electrical systems: battery, starting circuit, and charging circuit.
Explains how the electric starter motor engages the flywheel to crank the engine.
Describes how alternating coils cut magnetic fields to induce current from flywheel magnets.
Information on 12-volt lead-acid batteries used in Tecumseh engines.
Details on wiring systems, emphasizing insulation, secure connections, and foreign material prevention.
Procedures for testing the starting circuit, including checks for spark and power at the starter.
Testing various Tecumseh charging systems using voltmeter readings at different RPMs.
Performing tests on the DC adapter using an ohmmeter to check rectifier bridge continuity.
Procedures for removing and disassembling 12V/120V electric starters with exposed shafts.
Procedures for disassembling 12V/120V electric starters with cap assemblies.
Overview of Tecumseh's brake systems providing two methods for meeting compliance standards.
Explains how the brake pad applies pressure to the flywheel to stop the blade and kill ignition.
Describes the inside edge system where the brake pad applies to the flywheel edge, grounding the ignition.
Lists common components used in both Bottom Surface and Inside Edge brake systems, like brake lever and kill switch.
Instructions for removing the flywheel, noting the need to relieve brake pressure first.
Procedures for relieving brake pressure, removing, inspecting, and replacing the brake lever and pad.
Inspecting the ignition kill switch grounding clip for proper alignment and contact with the brake arm.
Assembling the control cable conduit correctly, ensuring proper lever travel and brake contact.
Replacing the control cable screw and ensuring proper lever travel for brake contact.
Overview of ignition systems: solid state capacitor discharge modules and magneto ignition systems.
Explains how CDI systems produce energy stored in a capacitor, released by an SCR.
Describes how magneto systems use mechanical contact points to trigger spark generation.
Steps for testing spark, checking spark plugs, and diagnosing ignition ground leads and switches.
Checking air gap between flywheel magnets and coil, and testing magnet strength.
Inspecting ignition cam, movable point arm, point assembly spring, contact points, and condenser.
Procedures for removing, cleaning, and adjusting spark plugs, including gap setting and torque.
Lists common causes for frequent spark plug fouling, such as rich carburetor settings or restricted air cleaners.
Explains the importance of ignition timing for maximum power and preventing kickback or power loss.
Information on standard point ignition systems used on small and medium frame engines.
Covers cylinder block, piston, crankshaft, camshaft, valves, and lubrication systems.
Explains the four piston strokes (intake, compression, power, exhaust) that complete an engine cycle.
Procedures for testing and diagnosing engine knocks, including checks for loose components and flywheel key.
Steps for diagnosing and resolving engine overheating issues, such as checking for overload and cleaning cooling fins.
Troubleshooting steps for engines that surge or run unevenly, including fuel cap venting and RPM checks.
Diagnosing engine misfires by checking spark plugs, carburetors, ignition timing, and valve seats.
General procedures for disassembling engine models, including disconnecting leads, draining fluids, and removing components.
Checking piston wear, ring side clearance, and inspecting skirt for scoring or scratches.
Checking ring end gap and side clearance, and staggering ring end gaps during reassembly.
Cleaning and inspecting top-mounted breathers, noting rubber boot and breather tube design.
Cleaning and inspecting the cylinder cover for wear, and applying Loctite to cover screw threads.
Removing and installing ball bearings from cylinder covers and crankshafts, including heating bearings.
List of technician's handbooks covering diagnosis and repair of different Tecumseh engine series.
List of available foreign language technician's handbooks for Tecumseh engines.
List of VHS video programs on carburetor troubleshooting, ignition systems, and transaxle repair.
List of special booklets including instructional guides, failure analysis, and troubleshooting guides.
Booklet containing quick reference information found on Tecumseh wall charts for engine servicing.
Booklets detailing test procedures for Tecumseh electrical components using specific testers.
General