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Tecumseh engine model, specification, and serial numbers are stamped or located on a decal.
Explains how to interpret the letters and numbers in a Tecumseh engine model number.
Outlines a minor tune-up procedure for engine performance.
Explains the function of the air cleaner to remove dust and dirt from intake air.
Describes how air is filtered through pre-cleaners and filter elements.
Lists and describes the parts of the air cleaner assembly.
Guides on checking the air cleaner for performance issues like smoking or power loss.
Step-by-step instructions for disassembling the air cleaner assembly.
Details cleaning and oiling procedures for polyurethane air filter elements.
States that paper filter elements can only be serviced by replacement.
Introduces float and diaphragm type carburetors and their basic functions.
Explains the operation of carburetors during choke, idle, and high-speed conditions.
Describes the function and types of fuel primers used to supply a fuel charge.
Describes the operation of float carburetors, including float height adjustment.
Explains diaphragm carburetors, their metering function, and tiltability advantage.
Identifies dual system carburetors by their primer bulb and lack of adjustment needles.
Describes Series 1 carburetors used on 2 and 4-cycle engines, noting variations.
Details Series 3 and 4 carburetors used on higher HP engines and how to identify them.
Explains the unique features of diaphragm carburetors, including their tiltability.
Details Series 8 carburetors with fixed main and idle circuits and a primer bulb.
Describes Series 9 carburetors, similar to Series 8 but with a different idle system.
Details Series 10 carburetors, identical to Series 8 but with a choke assist.
Explains Series 11 carburetors used on LEV models with an auto-enrichment system.
Introduces non-Tecumseh carburetors, specifically the Dellorto carburetor.
Describes the Dellorto carburetor, its features, and common applications.
Provides a flow chart for diagnosing engine starting problems based on spark and plug condition.
Covers carburetor pre-sets and adjustments, noting differences for emissionized models.
Explains how to perform final adjustments for main and idle mixture screws on non-emission engines.
Details the process of disassembling float type carburetors, including component removal.
Explains how to service the impulse fuel pump by disassembling and replacing parts.
Describes how to check and adjust float height for proper carburetor operation.
Details inspection of throttle and choke levers, shafts, and carburetor body for wear.
Explains how to inspect idle and high speed mixture needles for damage or wear.
Covers inspection of the fuel bowl retaining nut and its passages for debris.
Details inspection of the fuel bowl, float, needle, and seat for wear or damage.
Describes inspection of diaphragms, gaskets, and primer bulbs for cracks or wear.
Details the installation procedure for welch plugs in the carburetor.
Explains how to reassemble the throttle shaft and plate, noting screw usage.
Covers reassembly of the choke shaft and plate, emphasizing correct positioning.
Describes the installation of the fuel inlet fitting, noting the use of Loctite.
Explains how to install the inlet needle and seat assembly correctly.
Describes how to test the pop-off pressure of the needle and seat assembly.
Details the procedure for reinstalling the float, spring, clip, and inlet needle.
Details fuel bowl and bowl nut installation, including O-ring replacement and dimple function.
Explains the installation of impulse fuel pump diaphragms and gaskets.
Introduces governor assembly and linkage, explaining their function in maintaining RPM.
Describes how governor weights and spool control the throttle based on engine speed.
Illustrates and names various internal components of different governor styles.
Discusses engine problems suspected to be caused by the governor, like hunting or overspeeding.
Covers stabilizing RPM and checking governor adjustment for surging issues.
Explains governor adjustment procedures for various engine models and installations.
Covers replacing the governor gear or shaft on upset style governor shafts.
Details replacing the governor shaft on retaining ring style assemblies.
Describes the snap-in style speed control used on 3-6.75 HP engines and its adjustment.
Explains setting governed idle RPM and non-governed idle RPM for smooth operation.
Covers adjusting high speed RPM on medium frame vertical engines with up/down speed control.
Details setting governed and non-governed idle RPM for warm engine conditions.
Introduces rewind starters, their types, and how they engage the flywheel.
Explains the sequence of rope pulling, dog engagement, and rope retraction.
Identifies and illustrates the main components of rewind starters.
Discusses starter removal for diagnosis and refers to the Master Parts Manual.
Provides guidance on replacing starter rope, including part numbers and diameters.
Covers disassembly and assembly procedures for stylized and stamped steel starters.
Step-by-step instructions for disassembling stylized and stamped steel starters.
Outlines disassembly procedures for stylized rewind starters with plastic retainers.
Step-by-step instructions for disassembling standard stamped steel and cast aluminum starters.
Explains the assembly process for standard stamped steel and cast aluminum starters.
Step-by-step instructions for disassembling vertical pull starters with horizontal engagement.
Outlines disassembly and assembly procedures for vertical pull starters with vertical engagement.
Step-by-step instructions for disassembling vertical pull starters with vertical engagement.
Outlines the three main elements of the electrical system: battery, starting, and charging circuits.
Explains how the starting circuit and electric starter motor operate to crank the engine.
Describes how the charging circuit induces current in alternator coils via flywheel magnets.
Describes half-wave rectification using a single diode to process AC signals.
Explains full-wave rectification using a bridge rectifier to convert AC to DC.
Lists battery and wiring as key electrical system components.
Defines terms like alternator, ignition coil, rectifiers, diodes, conductors, and insulators.
Highlights the importance of checking the operator presence system for starting issues.
Outlines checks for power source, starter voltage, wiring, and mechanical binding.
Explains testing procedures for various Tecumseh charging systems, including voltage measurements.
Explains how to check the 1 Amp (18 Watt) add-on alternator and its voltage values.
Covers rectifier bridge checks using an ohmmeter for DC adaptors.
Describes checking the 2.5 Amp DC, 35 Watt lighting system and its voltage outputs.
Details checking the 3 Amp AC lighting alternator, including exterior tests and AC lead checks.
Outlines checking the fuse and diodes for proper function in the 3 Amp DC alternator system.
Describes checking the DC and AC voltage outputs of a combined 3 Amp DC / 5 Amp AC alternator system.
Explains the combined 3 Amp DC (battery) and 5 Amp AC (lighting) alternator system.
Provides minimum AC voltage readings for all models with alternators.
Details checking the 7 Amp alternator system with an external regulator-rectifier.
Details checking the 10 Amp alternator system with an external regulator-rectifier.
Explains checking the 10 Amp alternator system by measuring AC output.
Describes checking the 12 Amp DC regulated alternator and regulator function.
Explains how to check voltage regulators using a voltmeter and battery voltage readings.
Details checking the Low Oil Shutdown (LOS) switch operation and testing.
Provides disassembly and reassembly steps for electric starters with exposed shafts.
Details disassembly and reassembly steps for electric starters with cap assemblies.
Details the procedure for replacing the starter brush card assembly.
Explains Tecumseh brake systems and their compliance with federal standards for stopping blades.
Describes the bottom surface system operation, including brake pad engagement and kill switch function.
Details the operation of the bottom surface flywheel brake system when the control is released.
Explains the operation of the inside edge flywheel brake system, including ignition grounding.
Lists and describes components common to both bottom surface and inside edge brake systems.
Refers to Chapter 9 for flywheel removal procedures, noting brake pressure relief.
Covers inspection and replacement of the brake lever and pad assembly for contamination or wear.
Details relieving brake pressure and inspecting the brake pad on the bottom surface system.
Explains relieving brake pressure and inspecting the brake pad on the inside edge system.
Covers inspection of the ignition kill switch grounding clip for proper alignment and contact.
Details assembly and adjustment of the control cable for proper brake application.
Covers control cable assembly and adjustment for bottom surface brake systems.
Explains control cable assembly and adjustment for inside edge brake systems.
Details replacing the brake bracket, noting brake spring tension relief and alignment.
Introduces solid state CDI modules and magneto ignition systems, outlining their basic differences.
Explains the operation of solid state ignition (CDI) and magneto ignition systems.
Describes how the CDI system generates spark using a flywheel magnet and capacitor.
Explains how magneto ignition systems use points and a coil to generate spark.
Lists and labels the components of a Tecumseh magneto ignition system.
Describes the spark plug's construction and how it creates a spark to ignite the air-fuel mixture.
Details the construction and operation of contact points, their connection to the primary circuit, and opening mechanism.
Explains the function of the ignition cam in opening the contact points for ignition timing.
Describes the stator plate, its housing for ignition components, and the importance of clean laminations.
Explains the function of the flywheel key in positioning the flywheel and its impact on starting.
Details checking for spark using a spark tester and following manufacturer's recommendations.
Covers checking the spark plug for condition, damage, and proper air gap, recommending replacement if needed.
Explains how to test ignition switches, interlocks, wiring, and oil shutdown switches for grounding issues.
Details checking the air gap between flywheel magnets and external coil/module laminations.
Describes a rough test to check the magnetic strength of flywheel magnets using a screwdriver.
Covers examining stator components like ignition cam, points, and springs for wear or heat damage.
Details examining the ignition coil and lamination assembly for insulation cracks or damage causing shorts.
Explains how to test the ignition coil operation using an approved tester.
Details removing, cleaning, adjusting, and installing spark plugs, including torque specifications.
Lists common conditions that lead to frequent spark plug fouling.
Explains the importance of ignition timing for engine power and efficiency.
Discusses internal coils used on small/medium frame 4-cycle engines and checking ignition dimensions.
Explains how to install and use a dial indicator for measuring piston position relative to TDC.
Describes finding Top Dead Center (TDC) using a dial indicator and setting the dial to zero.
Explains how to rotate the crankshaft to specific B.T.D.C. dimensions to set ignition timing.
Details checking the stator position for proper ignition timing using a continuity light or ohmmeter.
Describes the fixed timed system with external coils and points, noting flywheel key importance.
Details setting the point gap for fixed timed systems and cleaning contact points.
Warns about using the correct flywheel key for timing accuracy in external coil systems.
Explains how to set solid state ignition timing using an air gap gauge and torque specifications.
Provides DO NOT and PLEASE DO tips for servicing ignition systems, including flywheel and spark plug handling.
Covers cylinder block, piston, head, crankshaft, camshaft, valves, and lubrication systems.
Explains the 4-cycle engine theory: intake, compression, power, and exhaust strokes.
Details the four piston strokes required for one power cycle and flywheel inertia.
Describes the intake stroke where the piston moves down, drawing in the air-fuel mixture.
Explains the compression stroke where the piston rises, compressing the mixture.
Describes the power stroke where ignition occurs, forcing the piston down.
Explains the exhaust stroke where piston movement forces out exhaust gases.
Details lubrication for horizontal shaft engines using splash systems and oil dippers.
Describes lubrication for vertical shaft engines using plunger or rotary oil pumps.
Explains the Ultra-Balance counterbalance system used to counteract engine imbalances.
Describes the cylinder block, its material, and housing for internal engine parts.
Explains the function of piston rings in sealing the cylinder and controlling oil.
Describes the connecting rod's role in linking the piston to the crankshaft.
Details the cylinder head, its material, and its function in engine cooling.
Explains how the crankshaft converts linear piston motion to rotational torque.
Describes the camshaft's function in operating the valves for air/fuel intake and exhaust.
Explains the function of valves in controlling the flow of air-fuel mixture and exhaust gases.
Describes the function of valve springs in returning valves to their closed position.
Explains how valve lifters maintain contact with the camshaft to operate the valves.
Describes the crankcase breather's function in managing crankcase pressure and air flow.
Details the cylinder cover's role in providing bearing surfaces for the crankshaft and camshaft.
Explains the oil pump system for vertical shaft engines.
Describes the flywheel's function in smoothing engine operation and its construction.
Lists potential causes for engine knocking, such as loose equipment or ignition timing.
Identifies causes of engine overheating, including excessive loading and clogged cooling fins.
Lists causes for engine surging or uneven running, like fuel cap vent obstruction or carburetor issues.
Outlines reasons for excessive oil consumption, such as high oil level or worn valve guides.
Identifies causes of excessive engine vibration, such as bent crankshaft or unbalanced equipment.
Lists causes for breather passing oil, like incorrect oil level or damaged breather components.
Identifies causes for lack of engine power, such as obstructed air intake or improper lubrication.
Details testing for engine knocks by checking crankshaft, flywheel key, and ignition timing.
Explains how to test for engine overheating by checking load, oil, cooling fins, and RPM settings.
Outlines testing for engine surges by checking fuel cap, air filter, carburetor, and linkages.
Covers testing for engine misfires by checking spark plugs, ignition timing, and valves.
Explains testing for breather passing oil by checking oil level, operation angle, and compression.
Covers testing for excessive oil consumption by checking oil level, viscosity, leaks, and engine compression.
Details testing for lack of engine power by checking air intake, oil, carburetor, and exhaust.
Covers checking valve seating and guide lash, recommending reconditioning or replacement if needed.
Details checking ignition timing and inspecting the flywheel key for shearing.
Refers to Chapter 9 for removing ignition components and covers spark plug service.
Provides general procedures for engine disassembly, applicable to most models.
Covers removing internal engine components, including aligning timing marks for valve lifter pressure release.
Details removing lifters, rod caps, and balance shafts or gears.
Explains removing carbon from the cylinder bore before piston removal to prevent ring damage.
Describes removing valves using a valve spring compressor, noting spring assembly differences.
Details visual inspection of the cylinder for damage and checking main bearings for wear.
Explains how to accurately measure cylinder bore using gauges and micrometers.
Describes the process of re-sizing a cylinder using a hone and proper drill press speeds.
Details honing the cylinder to the desired finish size using coarse and finishing stones.
Explains cleaning the cylinder and crankcase after honing.
Covers replacing pistons and rings with correct oversize parts.
Describes trenching in cylinders and its effect on horsepower, noting ring installation precautions.
Details checking the cylinder head for warpage using a flat surface.
Lists specific washer requirements for cylinder head bolts on certain engine models.
Covers inspection and replacement of pistons, rings, and connecting rods.
Explains how to check pistons for wear, ring side clearance, and piston skirt condition.
Details checking ring end gap and side clearance, and staggering ring end gaps during installation.
Describes emission rings used on compliant engines, their profile, and compatibility with pistons.
Covers installing connecting rods correctly, noting offset piston pins and match marks.
Details inspecting the crankshaft for wear, scoring, roundness, and bends.
Explains the importance of aligning camshaft and crankshaft timing marks for valve timing.
Covers checking camshaft bearing surfaces and cam lobes for wear, and notes on crankshaft replacement.
Describes MCR camshafts and their function in relieving compression for easier cranking.
Mentions newer RCR camshafts and their less aggressive ramp design.
Details the removal and installation procedure for LEV MCR cam bushings.
Covers checking valve clearance, sealing, and wear, and describes valve grinding and replacement.
Explains how to set or check valve clearance when the engine is cold.
Details carbon removal, valve face grinding, and valve replacement criteria.
Explains how to identify and install intake and exhaust valves correctly.
Details reinstalling valves, valve caps, springs, retainers, and pins.
Describes valve stem seals on emissionized engines and their purpose.
Explains that valve seats are not replaceable but can be reground using specific tools.
Details the recommended procedure for cutting valve seats using the Neway system and specific cutters.
Covers checking valve lifters for length differences and proper installation position.
Explains reaming oversize valve guides and the need to recut valve seats.
Covers cleaning and inspecting crankcase breathers, including drain hole orientation.
Describes the top mounted breather found on vertical shaft engines and its connection to the air cleaner.
Details cleaning and inspecting the cylinder cover, measuring bearing surfaces, and reinstallation.
Covers ball bearing service for crankshafts, including bearing lock removal and installation.
Details removing and reinstalling ball bearings from cylinder covers and crankshafts.
Covers replacing polypropylene fans and notes on flywheel magnets.
Lists various technician handbooks covering engine and transaxle repair.
Lists available video programs on carburetor troubleshooting, ignition systems, and transaxle repair.
Lists special booklets on master parts manual use, engine failure analysis, and carburetor troubleshooting.
Depicts specialty tools offered by Tecumseh for engines and motion drive systems.
Contains quick reference information found on Tecumseh wall charts for engine servicing.
Lists test procedures for electrical components using specific testers like Graham-Lee and Merco-O-Tronic.
Lists various oil seal protectors and installers for different engine models and shaft diameters.
Lists flywheel knock-off tools of various sizes for right-hand threads.
Describes the oil seal remover and notes variations in oil seal dimensions.
Lists crankshaft bearing diameters for use with bearing drivers.
Identifies the vibration tachometer tool.
Identifies the taper gap gauge tool.
Lists bearing drivers and bushing drivers for various engine sizes and applications.
Describes oversize valve guide reamers for small and medium/large frame engines.
Identifies the adjustment tool for OVRM and OHV11-17 engines.
Identifies the flywheel puller tool.
General| Compression Ratio | 6.5:1 |
|---|---|
| Engine Type | 4-stroke, single cylinder, air-cooled |
| Lubrication System | Splash |
| Oil Capacity | 20 oz |
| Fuel Type | Gasoline |
| Starter Type | Recoil |
