Model:
4 Cycle OHV Engines
Model Variants:
OV691EA, OV691EP, OV691XA, OV691XP, OV691RA, and other OV series models
Production Years Covered:
Emission regulation years 1995 through 2005
Engine Type:
Air-cooled, 4-stroke, overhead valve (OHV)
Delivery:
Instant download
Target Audience:
Technicians and DIY owners servicing small engines
Advantage:
Comprehensive coverage of all OHV engine systems with factory specifications and repair procedures
Coverage:
Includes complete engine, ignition, fuel, and governor systems
Detail:
Step-by-step instructions with specifications
Engine Mechanical:
Cylinder head, valve train, cylinder, piston, connecting rod, crankshaft, crankcase
Lubrication System:
Oil pump, oil filter, oil passages, oil types and capacities
Fuel System:
Carburetor, fuel pump, fuel lines, fuel tank, air cleaner
Ignition System:
Flywheel, ignition coil, spark plug, ignition timing
Governor System:
Mechanical governor, linkage, adjustment
Rewind Starter:
Recoil assembly, rope, spring, replacement
Electric Starter:
Starter motor, solenoid, wiring
Charging System:
Alternator, regulator, battery (if equipped)
Cooling System:
Air cooling, flywheel fan, cooling fins
Exhaust System:
Muffler, exhaust pipe
Emission Control:
Evaporative emission components, PCV system
Diagnosis:
Troubleshooting charts, no-start, performance, noise and smoke diagnosis
Disassembly:
Step-by-step removal and disassembly instructions
Inspection:
Clearance checks, wear limits, component testing
Repair:
Overhaul, valve adjustment, carburetor rebuild, ignition repair
Assembly:
Torque specifications, assembly sequences, adjustments
Maintenance:
Scheduled maintenance procedures, oil change, filter service, tune-up
Specifications:
Complete torque values, clearances, and wear limits
Illustrations:
Detailed diagrams and exploded views
Special Tools:
Reference to required special tools
Part Numbers:
Common replacement part numbers provided
Parts Identification:
Visual identification and location of components
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Engine Type:
Air-cooled, 4-stroke, overhead valve (OHV)
Cylinder Arrangement:
Single cylinder
Displacement:
Various displacements available; typically 14.5 cu in to 21.5 cu in (238 cc to 352 cc) depending on model
Bore and Stroke:
N/A - varies by model
Compression Ratio:
N/A - varies by model
Valve Train:
OHV, single intake and exhaust valve
Horsepower:
Ranges from 4 HP to 10 HP depending on model
Maximum Torque:
N/A - varies by model
Maximum RPM:
N/A - governed to specific application
Fuel System Type:
Carburetor
Fuel Pump:
Mechanical or gravity feed, depending on application
Fuel Type:
Regular unleaded gasoline
Fuel Capacity:
N/A - varies by application
Wheelbase:
N/A - not applicable
Length:
N/A - varies by application
Width:
N/A - varies by application
Height:
N/A - varies by application
Curb Weight:
N/A - varies by application
Dry Weight:
Approximately 30-50 lbs depending on model
Oil Change:
Every 50 hours of operation or annually
Air Filter:
Clean every 25 hours, replace every 100 hours
Spark Plug:
Replace every 100 hours
Fuel Filter:
Replace annually or every 100 hours
Engine Oil:
SAE 30 above 32°F, 5W-30 below 32°F
Oil Capacity:
Approximately 0.6-0.9 quarts depending on model
Fuel:
Regular unleaded gasoline, 87 octane minimum
Common Wear Items:
Carburetor rebuild, ignition coil failure, valve clearance adjustment, oil leaks
Preventive Maintenance:
Regular oil changes, air filter service, spark plug replacement
Manufacturer:
Tecumseh Products Company
Country of Origin:
United States
Introduction:
OHV engine line introduced in the 1980s
Discontinuation:
Tecumseh ceased engine production in 2009
Significant Changes:
Emission compliance updates through 2005
Manufactured In:
Various plants in the United States
