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General| Engine Type | V-twin |
|---|---|
| Bore x Stroke | Varies by model |
| Compression Ratio | Varies by model |
| Fuel System | Carburetor |
| Ignition System | Electronic |
| Cooling System | Air Cooled |
| Starter Type | Electric |
| Oil Capacity | Varies by model |
| Fuel Tank Capacity | Varies by model |
| Weight | Varies by model |
Explains engine model, specification, and date of manufacture on decals.
Explains letter and number designations for engine model and displacement.
Identifies new short blocks by S.B.V. tag for parts identification.
Recommends fresh, clean, unleaded gasoline and specifies acceptable blends.
Details recommended oil types, viscosity, capacity, and change intervals.
Provides a chart for routine maintenance intervals for various engine components.
Outlines a minor tune-up procedure for optimal engine performance.
Provides instructions for storing the engine for 30 days or more to prevent issues.
Explains the air cleaner's function in removing dust and dirt from intake air.
Describes how the air filter cover, pre-filter, and paper filter work together for filtration.
Details the parts of the air cleaner system: cover, pre-cleaner, and paper filter element.
Guides on checking air filters for performance issues like uneven running.
Provides procedures for cleaning the pre-filter and replacing the paper filter.
Introduces the TVT series twin carburetors and emission standards.
Explains the function of the float and inlet needle in maintaining fuel level.
Illustrates the idle, main nozzle, and choke circuits of the Series 7 carburetor.
Describes the governed idle system's role in maintaining engine speed under load changes.
Explains the function of metering holes in the idle mixing well.
Details the function of the idle speed adjustment screw as a stop.
Explains fuel/air mixture for intermediate operation or light loads.
Describes how airflow and venturi create low pressure for fuel delivery at high speeds.
Explains the importance of the atmospheric vent for fuel flow.
Describes how air is bled into the main nozzle for pre-atomized mixture.
Explains the idle air bleed passage function in the low speed circuit.
Provides procedures for testing spark and fuel delivery to diagnose starting issues.
Guides on checking fuel supply, fuel lines, and filters.
Details how to perform a cylinder compression balance test.
Explains how wet spark plugs indicate fuel supply and potential flooding.
Step-by-step guide for disassembling the carburetor.
Instructions for inspecting carburetor parts after disassembly for wear or damage.
Steps for reassembling WELCH PLUGS and the throttle shaft/plate.
Details the procedure for installing the choke shaft and shutter plate.
Covers inlet needle & seat installation and main jet assembly.
Describes installing the main nozzle spring and O-ring.
Guides on installing the float, inlet needle, and hinge pin.
Explains testing inlet needle and seat sealing with a pop-off tester.
Discusses the function and installation of the float bowl retaining bail.
Explains external mounting and operation of impulse fuel pumps.
Details how to test fuel pump lift and pressure holding capacity.
Step-by-step guide for servicing the valve type impulse pump.
Introduces the internal mechanical governor and its function.
Explains how governor weights, spool, and linkage control the throttle plate.
Discusses engine overspeed, hunting, and low power as potential governor issues.
Guides on adjusting governed idle and high speed RPM settings.
Provides steps to diagnose and correct engine overspeed conditions.
Offers troubleshooting steps for engine RPM surging.
Details the procedure for static adjustment of the governor.
Explains removal of governor spool, gear, and shaft.
Step-by-step guide for replacing the governor shaft.
Discusses throttle cable connections and governor spring setup.
Step-by-step procedures to synchronize twin carburetors.
Provides steps to synchronize choke shutters on twin carburetors.
Outlines the three main elements of an electrical system: battery, starting, and charging.
Describes component diagnosis and basic system diagram.
Explains rectification using diodes for charging batteries.
Details battery types and wiring considerations like insulation and gauge.
Lists Tecumseh's standard wiring color codes and gauge requirements.
Defines terms like alternator, rectifier, regulator, and conductors.
Lists fundamental checks before extensive electrical diagnostics.
Explains how the charging system generates current and tests diodes.
Describes the combined DC charging and AC lighting system.
Provides voltage test procedures for 3 Amp DC and 5 Amp AC charging systems.
Details checking the AC voltage output for this system.
A flowchart to diagnose charging circuit problems.
Explains how to check the regulator's function and voltage output.
Describes how to test and replace fuel shut-down solenoids.
Details testing the low oil pressure sensor for proper operation.
Explains the operation of the electric starter motor and its components.
Provides steps to test the starting circuit and battery.
A flowchart to diagnose electric starter circuit issues.
Covers service procedures for 12-volt electric starters.
Details the disassembly of 12-volt electric starter components.
Guides on inspecting starter components like pinion, brushes, and field coils.
Instructions for installing finishing nails for a brush holder jig.
Step-by-step guide for replacing starter brushes.
Lists components of the ignition system and maintenance requirements.
Explains the solid-state ignition system (CDI) operation.
Details the spark plug and its function in ignition.
Provides steps to test for spark and check ignition system components.
Covers spark plug service, fouling causes, and ignition timing.
Guides on spark plug inspection, gap setting, and replacement.
Lists common causes for spark plug fouling.
Explains ignition timing, kickback, and flywheel key importance.
Discusses air gap settings and flywheel key for timing.
Provides important "DO NOT" recommendations for ignition service.
Lists engine parts covered in the chapter and materials used.
Explains the engine's rotary pump lubrication system and oil flow.
Covers initial steps for engine disassembly, including fluid draining and component removal.
Guides on checking for warpage and disassembling cylinder heads.
Details specifications and inspection procedures for valves and their guides.
Covers checking valve spring specifications and proper installation.
Explains checking push rods for straightness and wear.
Describes reconditioning valve seats using specific cutters.
Covers inspection of internal engine components.
Guides on inspecting cylinder bores for damage and measuring dimensions.
Details piston specifications, inspection for scoring, and measuring.
Covers piston ring specifications, side clearance, and end gap checks.
Explains connecting rod specifications and proper installation alignment.
Guides on inspecting crankshaft bearing surfaces and checking for bends.
Explains the MCR system and servicing its components.
Details checking camshaft bearing surfaces and cam lobes for wear.
Guides on visually checking valve lifters for wear.
Covers cleaning, inspecting, and installing the cylinder cover.
Explains the crankcase breather components and installation.
Provides procedures for assembling the engine, starting with crankshaft and piston.
Continues assembly, covering oil pump, breather, and cylinder head installation.
Final assembly steps including push rods, valve lash, flywheel, and carburetors.
Lists potential causes for engine knocking and checks.
Provides steps to diagnose and resolve engine overheating issues.
Guides on diagnosing and fixing uneven engine running.
Lists checks for engine misfires, including spark plugs and fuel.
Steps to diagnose and correct excessive engine vibration.
Guides on troubleshooting oil passing through the breather.
Lists checks for excessive engine oil consumption.
Provides troubleshooting steps for lack of engine power.
Lists specifications for TVT 691 engines, including pistons and valves.
Continues specifications for TVT 691 engines, including crankshaft and connecting rod.
Provides torque specifications for various engine components.
Lists special service, diagnostic, measurement, and repair tools with part numbers.
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