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Locating and interpreting engine model, serial numbers, and date of manufacture.
Understanding the meaning of letters and numbers in Tecumseh engine model designations.
Identification and transfer of model numbers for short block replacement.
Recommendations for using fresh, clean unleaded gasoline and reformulated fuels.
Guidelines for selecting and changing engine oil, including capacities and intervals.
A minor tune-up procedure to ensure proper engine operation.
Procedures for storing engines for 30 days or more, including fuel system draining.
The function of the air cleaner in removing dust and dirt from engine intake air.
How the air cleaner components work together to filter air for the engine.
Description of the different parts of the air cleaner assembly.
Diagnosing engine problems caused by a restricted or dirty air cleaner element.
Service procedures for polyurethane and paper air filter elements.
Step-by-step instructions for disassembling the air cleaner assembly.
Cleaning, oiling, and re-oiling procedures for polyurethane air filter elements.
Information on servicing paper air filter elements, which only requires replacement.
Overview of float and diaphragm carburetors and their identification.
Explanation of carburetor operation at different engine speeds.
Function, types, and installation of fuel primers for easier starting.
How impulse fuel pumps are mounted, connected, and operated.
Description of float bowl fuel level maintenance and float height settings.
Explanation of diaphragm carburetor operation and advantages.
Detailed diagram and identification of carburetor components.
Identification of dual system carburetors used on 4-cycle vertical crankshaft engines.
Characteristics and applications of Series 1 float style carburetors.
Identification of Series 3 and 4 carburetors used on larger 4-cycle engines.
Description of Series 6 carburetors used on 2 and 4-cycle engines.
Features of Series 8 carburetors with fixed main and idle circuits.
Characteristics of Series 9 carburetors with simple fixed idle systems.
Details of Series 10 carburetors, identical to Series 8 but with a choke.
Information on Dellorto carburetors, similar to dual system carburetors.
Flow chart for diagnosing engine starting problems.
Chart to diagnose carburetor symptoms based on air, diaphragm, and fuel system issues.
Procedures for testing engine and fuel systems for starting issues.
General service notes and procedures for carburetor adjustment.
Pre-setting and adjusting mixture screws for proper carburetor operation.
Procedure for making final adjustments to main and idle mixture screws.
Step-by-step guide for disassembling float style carburetors.
Disassembly procedure for diaphragm carburetors.
Procedure for servicing the impulse fuel pump.
How to check and adjust the float height for proper carburetor operation.
Inspection of carburetor components after disassembly.
Checking throttle and choke levers, shafts, and carburetor body for wear.
Inspection of mixture adjusting screw tips and tapered surfaces.
Inspection of the fuel bowl retaining nut and its passages.
Inspection and replacement of float bowl, float, needle, and seat.
Inspection of diaphragms, gaskets, and primer bulbs for damage.
General assembly procedures for carburetors.
Procedure for installing new welch plugs after carburetor cleaning.
Reassembly of the throttle shaft and plate, including screw replacement.
Reassembly of the choke shaft and plate, noting screw replacement.
Procedure for installing the fuel inlet fitting squarely into the carburetor body.
Procedure for installing the primer bulb retainer and bulb.
Performing final checks and pre-setting adjustment screws before installation.
Using original parts or new parts for standard service carburetors.
Instructions for installing the fuel fitting in a new carburetor body.
Replacing the choke shaft and shutter, and testing choke operation.
Removing and installing the throttle lever and spring.
Removing and installing the idle speed adjustment screw assembly.
Overview of governor assembly and linkage for speed control.
How governor weights and spool maintain constant engine RPM.
Illustrations of different internal governor component styles.
Diagnosing engine problems suspected to be caused by the governor.
Procedure for diagnosing and correcting engine overspeed conditions.
Troubleshooting engine RPM surging and governor adjustment.
Service procedures for governor adjustment.
Steps for adjusting the governor clamp on the governor lever.
Specific governor adjustment for short block installations prior to 1977.
Procedures for removing and replacing governor spool, gear, or shaft.
Replacing the governor spool on upset style governor shafts.
Replacing the governor gear or shaft on upset style shafts.
Replacing the governor shaft on retaining ring style assemblies.
Information on different speed control and linkage types and their attachment.
Adjusting engine speed using bendable tabs on snap-in style speed controls.
Adjusting speed control for medium frame vertical engines.
Setting governed and non-governed idle RPM for engines.
Adjusting high speed RPM for medium frame vertical engines.
Types of rewind starters used on Tecumseh engines.
How the rewind starter mechanism engages and disengages.
Diagram and identification of rewind starter components.
Procedures for diagnosing and repairing starter problems.
Guidelines for selecting and replacing rewind starter rope.
Procedure for replacing the rope retainer.
Disassembly and assembly of stylized and stamped steel rewind starters.
Steps for disassembling stylized and stamped steel rewind starters.
Steps for assembling stylized and stamped steel rewind starters.
Disassembly and assembly of stylized rewind starters with plastic retainers.
Steps for disassembling rewind starters with plastic retainers.
Steps for assembling rewind starters with plastic retainers.
Disassembly and assembly of standard stamped steel and cast aluminum starters.
Steps for disassembling standard stamped steel and cast aluminum starters.
Steps for assembling standard stamped steel and cast aluminum starters.
Disassembly and assembly for vertical pull starters with horizontal engagement.
Steps for disassembling horizontal engagement vertical pull starters.
Steps for assembling horizontal engagement vertical pull starters.
Disassembly and assembly for vertical pull starters with vertical engagement.
Steps for disassembling vertical engagement vertical pull starters.
Steps for assembling vertical engagement vertical pull starters.
Overview of the three main elements of the electrical system: battery, starting, charging.
How the starting circuit and charging circuit function.
Explanation of the electric starter operation and engagement.
How the charging circuit induces current in the alternator coil.
Using diodes or rectifiers to convert AC to DC for battery charging.
How a single diode allows only the positive half of the AC signal.
Using a bridge rectifier to convert the entire AC signal to DC.
Identification of electrical system components.
Information on 12-volt lead-acid batteries used with Tecumseh engines.
Description of wiring materials and conditions to check.
Importance of wire gauge in electrical circuits and wire diameter.
Definitions of electrical terms like alternator, ignition coil, and rectifier.
Fundamental checks before extensive electrical system diagnostics.
Flow chart for diagnosing electrical starter circuit problems.
Flow chart for diagnosing electrical charging circuit problems.
Procedures for testing the starting and charging circuits.
Testing the power source, starter terminal voltage, and connections.
Testing charging systems using wiring diagrams and voltmeter.
Checking the 350 Milliamp charging system by testing battery voltage.
Checking the 18 Watt AC lighting alternator system.
Checking the 1 Amp (18 Watt) add-on alternator system.
Tests for the DC charging adaptor using an ohmmeter and rectifier bridge.
Checking the 2.5 Amp DC, 35 Watt lighting system.
Checking the 3 Amp AC lighting alternator system.
Checking the 5 Amp alternator system with regulator-rectifier under blower housing.
Checking voltage regulators using a voltmeter for battery charging issues.
Checking the low oil shutdown switch function.
Checking the lighted rocker switch and low oil shutdown.
Checking the 7 Amp alternator system with regulator-rectifier under engine block.
Checking the 10 Amp alternator system with external regulator-rectifier.
Overview of Tecumseh's brake systems meeting compliance standards.
How the flywheel brake system stops the engine and blade.
Operation of the bottom surface flywheel brake system.
Operation of the inside edge flywheel brake system.
Identification of components used in both brake systems.
Service procedures for flywheel brake systems.
Procedure for removing the flywheel after relieving brake pressure.
Service procedures for the brake lever and pad assembly.
Service for the bottom surface brake lever and pad.
Service for the inside edge brake lever and pad.
Checking the ignition kill switch grounding clip for proper alignment.
Checking and replacing the starter interlock switch.
Assembling the control cable conduit and checking cable travel.
Procedure for replacing the inside edge brake bracket assembly.
Overview of solid state capacitor discharge and magneto ignition systems.
How solid state and magneto ignition systems produce a spark.
Explanation of CDI system energy storage and voltage transformation.
How magneto systems generate spark through contact points.
Identifying internal, external, and solid state ignition systems.
Identification of parts in a magneto ignition system.
Flow chart for diagnosing engine ignition problems.
Procedures for testing ignition systems and components.
Checking for spark and related components in the starting circuit.
Service procedures related to ignition components.
Procedures for cleaning, adjusting, and replacing spark plugs.
Common causes of frequent spark plug fouling.
Procedure for setting ignition timing for optimal engine performance.
Information on standard point ignition systems and timing specifications.
Description and timing procedures for fixed timed systems with external coils.
Setting the ignition timing for solid state ignition systems.
Information on solid state systems located under the flywheel.
Important tips and warnings regarding ignition system service.
Overview of internal engine components like pistons, crankshaft, and valves.
Explanation of the 4-cycle engine theory and piston strokes.
Detailed explanation of the four strokes: intake, compression, power, exhaust.
Description of lubrication systems for horizontal and vertical shaft engines.
Information on Ultra-Balance counterbalance systems.
Identification and function of major internal engine components.
Troubleshooting common engine operation issues like knocks, overheating, and misfires.
Diagnosing and resolving engine misfire problems.
Troubleshooting excessive engine vibration.
Diagnosing and resolving issues with the breather passing oil.
Troubleshooting excessive engine oil consumption.
Diagnosing and resolving engine power loss issues.
Procedures for testing specific engine operation problems.
Testing for and diagnosing engine knock conditions.
Testing for and diagnosing engine overheating conditions.
Testing for and diagnosing engine surging or uneven running.
Testing for and diagnosing engine misfire conditions.
General service information for internal engine components.
General procedures for engine disassembly.
Inspection, measurement, and re-sizing procedures for cylinder bores.
Checking cylinder head for warpage and head bolt torque specifications.
Inspection and measurement of pistons, rings, and connecting rods.
Checking piston for wear, ring side clearance, and skirt condition.
Checking ring end gap and side clearance, and installation procedures.
Characteristics and installation of emission rings.
Proper installation of connecting rods to pistons and crankshafts.
Inspection and timing alignment for crankshafts and camshafts.
Checking camshaft bearing surfaces, lobes, and types of compression release.
Checking valve clearance, sealing, wear, and installation.
Procedure for cutting and narrowing valve seats.
Correct installation of valve lifters based on length.
Reaming valve guides oversize and redrilling valve spring caps.
Cleaning and installation of crankcase breathers.
Procedure for servicing top mounted breathers.
Servicing side mounted breathers with reed style check valves.
Information on integral breathers as part of the cylinder block.
Service procedures for cylinder cover, oil seals, and bearings.
Cleaning and inspection of the cylinder cover bearing surfaces.
Procedures for removing and installing oil seals.
Ball bearing service procedures for crankshafts.
Specific procedures for servicing ball bearings in H40-HM100 engines.
Procedure for correctly aligning the Ultra-Balance system.
Procedures for replacing polypropylene fans and servicing flywheel magnets.
Torque specifications for replacing components on engines.
Continued torque specifications for engine components.
Engine specifications for standard point ignition systems.
Continued engine specifications for standard point ignition systems.
Engine specifications for solid state and external ignition systems.
Continued engine specifications for solid state and external ignition systems.
Table for converting decimal measurements to fractions.
List of technician's handbooks covering engine diagnosis and repair.
List of foreign language technician's handbooks for engine repair.
List of VHS video programs for carburetor and ignition system troubleshooting.
List of special booklets on various technical topics and procedures.
Guide to using the Tecumseh Master Parts Manual and carburetor parts breakdown.
Booklet designed to help technicians assess causes of 4-cycle engine failures.
Quick reference booklet for carburetor problems and repair procedures.
Booklet for identifying and troubleshooting Tecumseh ignition systems.
Booklet detailing specialty tools for engines and Peerless units.
Workbench guide for servicing engines and motion drive systems.
Test procedures for electrical components using specific testers.
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