Tecumseh OHV125-203020A Manuals

Manuals and User Guides for Tecumseh OHV125-203020A. We have 1 Tecumseh OHV125-203020A manual available for free PDF download: Handbook

Tecumseh OHV125-203020A Handbook

Tecumseh OHV125-203020A Handbook (95 pages)

4-CYCLE OVERHEAD VALVE ENGINES

Brand: Tecumseh | Category: Engine | Size: 3 MB

Table of Contents

Contents
2
Chapter 1 General Information

4
- Engine Identification
  4
- Interpretation of Model Number
  4
- Engine Oil
  5
- Fuels
  5
- Short Blocks
  5
- Oil Change Intervals
  6
- Oil Change Procedure
  6
- Oil Check
  6
- Tune-Up Procedure
  6
- Draining the Fuel System
  7
- Oil Cylinder Bore
  7
- Storage
  7
- Air Cleaners
  8
- Components
  8
- Operation
  8
- Disassembly Procedure
  9
- Service
  9
- Troubleshooting or Testing
  9
- Flocked Screen
  10
- Paper-Type Filter Element
  10
- Polyurethane-Type Filter Element or Pre-Cleaner
  10
- Carburetors and Fuel Systems
  11
- Float Style Carburetors
  12
- Fuel Primers
  12
- Impulse Fuel Pumps
  12
- Carburetor Visual Identification
  13
- Series 1 Carburetors
  13
- Series 3 & Series 4 Carburetors
  13
- Series 6 Carburetors
  13
- Series 10
  14
- Series 8
  14
- Series 9
  14
- Walbro Model LMK
  14
- Carburetor Pre-Sets and Adjustments
  15
- Testing
  15
- Final Adjustments
  16
- Pre-Sets and Adjustments (Tecumseh and Walbro Carburetors)
  16
- Tecumseh Carburetors
  16
- Carburetor Disassembly Procedure
  17
- Impulse Fuel Pump
  18
- Float Adjusting Procedure
  19
- Idle and High Speed Mixture Adjusting Screw
  19
- Inspection
  19
- Throttle and Choke
  19
- Fuel Bowl, Float, Needle and Seat
  20
- Assembly Procedure
  21
- Throttle Shaft and Plate
  21
- Welch Plugs
  21
- Choke Shaft and Plate
  22
- Fuel Inlet Fitting
  22
- High and Low Speed Adjusting Screw, Main Nozzle
  22
- Float Installation
  23
- Inlet Needle and Seat
  23
- Fuel Bowl and Bowl Nut
  24
- Installing the Float Bowl
  24
- Primer Bulb
  24
- Engine Overspeeding
  25
- Engine Surging
  25
- Governors and Linkage
  25
- Troubleshooting
  25
- Governor Adjustment
  26
- Governor Gear and Shaft Replacement, Upset Style Governor Shaft
  26
- Governor Gear and Shaft Service
  26
- Governor Shaft Replacement, Retaining Ring Style
  27
- OHH Governed Idle Speed Control
  28
- OHH Remote Speed Control
  28
- Speed Controls and Linkage
  28
- Conversion to Remote Control
  30
- OHV 11-17 Horizontal Speed Control
  31
- OVM, OVXL, OHV Vertical Speed Control
  31
- Recoil Starters
  32
- Rope Service
  32
- Rope Retainer Replacement
  33
- Stylized Rewind Starter and Stamped Steel Starter
  33
- Stylized Rewind Starter with Plastic Retainer
  34
- Keeper Spring Style Starters
  35
- Charging Circuit
  38
- Electrical Systems
  38
- Starting Circuit and Electric Starters
  38
- Converting Alternating Current to Direct Current
  39
- Full Wave Rectifier Bridge Rectifier
  39
- Half Wave Rectifier Single Diode
  39
- Basic Checks
  40
- Electrical Terms
  40
- Wire Gauge
  40
- Troubleshooting Electrical Starter Circuit Flow Chart
  41
- Troubleshooting Electrical Charging Circuit Flow Chart
  42
- 350 Milliamp Charging System
  43
- Charging Circuit Testing Procedure
  43
- Starting Circuit Testing Procedure
  43
- 18 Watt A.C. Lighting Alternator
  44
- 2.5 Amp D.C., 35 Watt Lighting
  44
- 3 AMP DC Alternator System - Diode in Harness Sleeve
  45
- 3 Amp D.C. 5 Amp A.C. Alternator
  46
- 5 AMP D.C. Alternator System Regulator-Rectifier under Blower Housing
  46
- Models OHV 13.5-17.0 (3/5 Amp Split)
  47
- Models OVM/OVXL/OHV12.5
  47
- 7 Amp D.C. Alternator System Regulator - Rectifier under Engine Housing
  48
- 10 Amp A.C. Alternator
  49
- 16 Amp Alternator System with External Regulator
  49
- Fuel Shut-Down Solenoids
  49
- Voltage Regulators
  49
- Low Oil Shutdown Switches
  50
- 12 Volt or 120 Volt Electric Starters
  51
- Electric Starter Service
  51
- Low Oil Pressure Sensor
  51
- Low Oil Sensor
  51
- Brush Card Replacement
  52
- Inspection and Repair
  52
- Flywheel Brake Systems
  53
- Brake Bracket Assembly
  55
- Control Cable
  55
- Ignition Groundout Terminal
  55
- Starter Interlock Switch
  55
- Ignition
  56
- Solid State Ignition System (CDI)
  56
- Four Cycle Ignition Troubleshooting
  58
- Conditions Causing Frequent Spark Plug Fouling
  59
- Spark Plug Service
  59
- Ignition Timing Check
  60
- 4-Cycle Engine Theory
  61
Chapter 9 Internal Engine and Cylinder

61
- Counterbalance Systems
  62
- Lubrication Systems
  62
- Engine Operation Problems
  64
- Engine Knocks
  66
- Engine Misfires
  66
- Engine Overheats
  66
- Engine Surges or Runs Unevenly
  66
- Breather Passing Oil
  67
- Engine Vibrates Excessively
  67
- Excessive Oil Consumption
  67
- Engine Disassembly Procedure
  68
- Lacks Power
  68
- Cylinders
  71
- Cylinder Head and Valve Train Service
  72
- Valves, Springs, and Push Rods
  72
- Piston
  73
- Piston Ring Orientation
  73
- Piston Rings
  73
- Connecting Rods
  74
- Crankshafts and Camshafts
  74
- Valve Seats
  75
- Valve Guide Installation
  76
- Valve Guide Removal
  76
- Valve Guides
  76
- Valve Lifters
  76
- Crankcase Breathers
  77
- Side Mounted Breather
  77
- Top Mounted Breather
  77
- Ball Bearing Service
  78
- Crankshaft Bearing Service
  78
- Cylinder Cover
  78
- Oil Seal Service
  78
- Engine Assembly
  79
- Service Bushing
  79
- Engine Specifications and Sears Craftsman Cross-Reference
  86
- Overhead Valve Torque Specifications
  89
- Educational Materials and Tools
  91

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