Tecumseh TM SERIES Technician's Handbook
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Tecumseh TM SERIES Technician's Handbook

Tecumseh TM SERIES Technician's Handbook

2-cycle engines tm series; tc series;
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TECUMSEH
T E C H N I C I A N ' S
H A N D B O O K
TC/TM SERIES
2-Cycle
Engines
ENGINES
TRANSMISSIONS
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Summary of Contents for Tecumseh TM SERIES

  • Page 1 TECUMSEH T E C H N I C I A N ‘ S H A N D B O O K TC/TM SERIES 2-Cycle Engines ENGINES TRANSMISSIONS &...
  • Page 2 • You would like to request additional printed copies of this handbook. Safety Defi nitions You may fi nd your Authorized Tecumseh Servicing Dealer on our website at www.TecumsehPower.com Statements in this manual preceded by the following words and or call Tecumseh Power Company at 1-800-558-5402 graphics are of special signifi...

  • Page 3: Table Of Contents

    GENERAL INFORMATION ........................11 OPERATION ............................11 FUEL PRIMERS ............................ 12 COMPONENTS............................. 13 ENGINE TROUBLESHOOTING ......................16 TROUBLESHOOTING CARBURETION—TC/TM SERIES ..............17 TESTING ............................... 19 SERVICE............................... 19 CARBURETOR PRE-SET AND ADJUSTMENT ................... 19 CARBURETOR DISASSEMBLY ......................20 CARBURETOR INSPECTION ......................20 CARBURETOR ASSEMBLY .........................
  • Page 4 CHAPTER 6 IGNITION ......................30 GENERAL INFORMATION ........................30 OPERATION ............................30 COMPONENTS............................. 30 IGNITION TROUBLESHOOTING ......................31 TESTING............................... 32 SERVICE............................... 32 AIR GAP SETTING ..........................32 SPARK PLUG SERVICE........................32 CHAPTER 7 INTERNAL ENGINE AND CYLINDER ............33 GENERAL INFORMATION ........................33 OPERATION ............................

  • Page 5: Chapter 1 General Information

    Failure to follow the instructions and warnings may All engine exhaust contains carbon result in serious injury or death. Call Tecumseh Power monoxide, a deadly gas. Breathing Company at 1-800-558-5402 or visit www.Tecumseh- carbon monoxide can cause headaches, dizziness, Power.com if you have any questions.
  • Page 6 Operate Equipment Safely Operation of equipment presented for service can be hazardous. To avoid serious injury or death, DO NOT operate equipment, until: • all relevant inspection procedures presented in this handbook are performed and • technician is satisfied equipment can be operated safely.

  • Page 7: Engine Identification

    The engine identification decal will include the model number, engine type, warranty code, and date of manufacture. See diag. 1-2 and 1-3. The model number designation following TC (Tecumseh Compact) indicate the cubic inch displacement of the engine. TC300 indicates a 3.0 cubic inch displacement.
  • Page 8 Table 1-1. TC200 Engine Model Code Designations diag. 1-2. Using model TC200-2015B 2354D as an example, inter- Code Model Number pretation is as follows: See Table 1-1. Indicates Tecumseh Engine Manufac- turer. Indicates compact model. Indicates 2.0 cubic inch displacement. Code Specification Number...

  • Page 9: Oil Requirements

    OIL REQUIREMENTS Tecumseh recommends using two-cycle oil part # 730227C, which is a synthetic blend that ensures cylinder wall lubrication, mixes easy, and does not separate. Two cycle oil part # 730227C is specially formulated for use in air or water cooled two cycle engines and contains an added fuel stabilizer.

  • Page 10: Fuel Requirements

    See “STORAGE” instructions in Technician’s Manual, Operator’s Manual, or Bulletin 111. Tecumseh two-cycle oil part # 730227C contains a fuel stabilizer for year round fuel stability in and out of season. If oil other than Tecumseh two cycle is used, use Tecumseh's fuel stabilizer part # 730245.

  • Page 11: Tune-Up Procedure

    TUNE-UP PROCEDURE The following is a minor tune-up procedure. If the engine does not perform properly after the tune-up is completed, consult the "Troubleshooting Engine Operation Chart" found in Chapter 7. Repair procedures are listed in each chapter. Remove the spark plug wire before doing any service work on the engine. CAUTION 1.

  • Page 12: Storage

    To prevent deposits from forming, all gasoline must be removed from the fuel tank and the carburetor. An acceptable alternative to removing all gasoline is adding a fuel stabilizer to the gasoline such as Tecumseh part # 730245A. A fuel stabilizer is added to the fuel tank or storage container. Always follow the mix ratio and mixing procedure found on the stabilizer container.

  • Page 13: Chapter 2 Air Cleaners

    Dirt allowed into the engine will quickly wear the internal components and shorten the life of the engine. Tecumseh engines use either a polyurethane or a paper type air filter system. A polyurethane pre-filter or a flocked screen may be used in conjunction with the main filter. Extremely dirty operating conditions may require frequent filter cleaning or replacement.

  • Page 14: Paper Filter Removal And Replacement

    Paper Filter Removal and Replacement 1. Remove the polyurethane pre-filter (if equipped) from the air filter. Poly Pre-Filter 2. Inspect filter(s) discoloration dirt accumulation. (For the polyurethane pre-cleaner service see step # 5 under "Polyurethane Filter Removal and Service"). If either condition is present, replace the paper type filter using the following steps.

  • Page 15: Chapter 3 Carburetors And Fuel Systems

    (maintaining the proper fuel level in the carburetor) as the float. A limited number of TC engines were produced as outboards using a Tecumseh Series II float style carburetor. Consult the Two Cycle Technician's Handbook (part # 692508) if service is required on this series of carburetor.

  • Page 16: Fuel Primers

    At IDLE the throttle shutter is almost closed, the low pressure acts only on the primary idle fuel discharge port Fuel due to throttle plate position. A relatively small quantity of Impulse fuel is needed to operate the engine (diag. 3-3). Intake Air Engine Vacuum During INTERMEDIATE throttle operation, the secondary...

  • Page 17: Components

    COMPONENTS WALBRO CARBURETOR 1. Diaphragm Cover Screw 2. Metering Diaphragm Cover 3. Diaphragm 4. Diaphragm Gasket 5. Metering Lever 6. Metering Lever Screw 7. Metering Lever Pin 8. Metering Lever Spring 9. Inlet Valve Needle 10. Inlet Valve Seat 11. Welch Plug 12.
  • Page 18 TILLOTSON CARBURETOR 1. Diaphragm Cover Screw 2. Metering Diaphragm Cover 3. Diaphragm 4. Diaphragm Gasket 5. Metering Lever 6. Metering Lever Screw 7. Metering Lever Pin 8. Metering Lever Spring 9. Inlet Valve Needle 10. Air Vane 11. Air Vane Screw 12.
  • Page 19 TECUMSEH CARBURETOR 1. Diaphragm Cover Screw 2. Metering Diaphragm Cover 3. Diaphragm 4. Diaphragm Gasket 5. Metering Lever Screw 6. Metering Lever Pin 7. Inlet Valve Needle 8. Metering Lever 9. Metering Lever Spring 10. Welch Plug 11. Dust Seal 12.

  • Page 20: Engine Troubleshooting

    ENGINE TROUBLESHOOTING Engine Will Not Start See Chapter 6 Check For Spark under "Troubleshooting" Check If Spark Plug Is Wet or Dry Check Compression Release Defective Spark Plug for Stuck Open Condition Check Fuel Supply Restricted Air Filter and Fuel Cap Vent Restriction in Fuel System Improper or Stale Fuel (filter, screen)

  • Page 21: Troubleshooting Carburetion-Tc/Tm Series

    TROUBLESHOOTING CARBURETION—TC/TM SERIES ADJUSTMENTS ● ● ● ● ● ● ● ● ● ● ● High FUEL SYSTEM ● ● ● ● ● ● Plugged Tank Filter or Vent ● ● ● ● ● Restricted Fuel Line ● ● ●...
  • Page 22 TROUBLESHOOTING CARBURETION—TC/TM SERIES (CONTINUED) METERING SYSTEM LEVER ● Worn Lever ● ● ● ● ● ● ● Set Too High ● ● ● Set Too Low ● ● ● ● ● ● ● Not Free SPRING ● ● Distorted ●...

  • Page 23: Testing

    1. After repeated efforts to start the engine using the procedure listed in the operator's manual fail, check for spark by removing the high tension lead and removing the spark plug. Install a Tecumseh Spark Plug Tester (part # 670366) and check for spark.

  • Page 24: Carburetor Disassembly

    CARBURETOR DISASSEMBLY Dust Seal Retainer Metering Lever 1. Note or mark the location and sequence of the Metering Lever Pin diaphragm(s), gasket(s), and the metering or pump cover. Remove the screw(s), gaskets, and diaphragms. Dust Seal Metering Lever Screw 2. Remove the idle mixture screw. On Tillotson model Metering Lever Spring Dust Seal HU carburetors, remove the plastic screw or brass...

  • Page 25: Carburetor Assembly

    Walbro carburetors. On Metering Lever Tip 3-14 Tecumseh and Tillotson carburetors the tip of the metering lever should be flush with surface of the carburetor body. 6. Install the idle mixture screw and spring and back the screw out from the closed position 1 - 1-1/8 turns for Walbro, 1-1/4 - 1-3/8 turns for Tillotson carburetors.
  • Page 26 11. If applicable, attach the air vane and torque the mounting screw to 3-5 inch pounds (.34 Nm - .57 Nm). 12. TC and TM series engines use an insulator / spacer between the carburetor and cylinder. That spacer MUST be installed correctly for the fuel pump to operate (diag.
  • Page 27 TC/TM, EMISSIONIZED TECUMSEH CARBURETOR The Tecumseh emissions diaphragm carburetor has fixed main and idle jets (diag. 3-18). It uses a married idle and high speed circuitry. The idle has a metering jet that can be removed for cleaning. It is covered by a small cap that must be removed to expose the jet for servicing.

  • Page 28: Fuel Tank Service

    FUEL TANK SERVICE Lock Nut TC Type II/TM engines have fuel tanks with an integral fuel screen and integral outlet fuel fitting. Integral screens or Washer fittings are not serviceable (diag. 3-19). Some TC Type I engine models use a pressed in fuel filter or a weighted filter and a flexible fuel line in the tank.

  • Page 29: Chapter 4 Governors And Linkage

    GENERAL INFORMATION TC/TM series engines are equipped with pneumatic (air vane) governors. The governor's function is to maintain a R.P.M. setting when engine loads are added or taken away. Air vane governors are controlled by the air velocity created by fins on the flywheel.

  • Page 30: Troubleshooting

    TROUBLESHOOTING ENGINE OVERSPEEDING 1. If the engine runs wide open (faster than normal), shut the engine off or slow it down immediately. 2. Visually inspect the air vane, linkage, carburetor throttle shaft, and speed control for debris blockage, binding, breakage, or incorrect hook-up. Check the governor spring for a stretched or distorted condition. To view the components, remove the recoil assembly and/or fuel tank if necessary.
  • Page 31 TC TYPE I and some TC Type II ADJUST GOVERNED HIGH SPEED WITH SPEED CONTROL PLUNGER PULLED BACK AGAINST SPEED ADJUSTMENT SCREW DECREASE INCREASE SPEED ADJUST SCREW AIR VANE MUST ROTATE FREELY AFTER CLIP IS INSTALLED ITEM DESCRIPTION ITEM DESCRIPTION Base - Housing Spring - Governor Body Assy.

  • Page 32: Chapter 5 Rewind Starters

    GENERAL INFORMATION TC/TM series engines have the recoil assembly as a part of the engine's blower housing. Two different styles of recoil starters are used along with different starter rope locations. Use the engine model and specification number to identify the recoil style and correct replacement parts.

  • Page 33: Assembly Procedure

    2. Release the recoil spring tension on the rope by removing the staple or knot in the starter handle and slowly release the rope into the recoil housing (diag. 5-2). 3. Remove the 5/16" retainer screw. On TC Type I starters, remove the pawl retainer, brake spring, and pawl.

  • Page 34: Chapter 6 Ignition

    CHAPTER 6 IGNITION GENERAL INFORMATION All TC/TM engines are equipped with a solid state ignition module mounted outside the flywheel. The solid state ignition system consists of a flywheel magnet, charge coil, capacitor, a silicon controlled rectifier, a pulse transformer, trigger coil, high tension lead, and a spark plug.

  • Page 35: Ignition Troubleshooting

    IGNITION TROUBLESHOOTING Engine Runs Erratically Engine Will Not Start Or Shuts Off, Restarts Check For Spark SPARK NO SPARK Replace spark plug Check compression release for stuck open condition Isolate engine and repeat test Check flywheel for damaged SPARK NO SPARK or sheared key Equipment problem, check Engine problem, check for...

This manual is also suitable for:

Tc seriesTc300-3133c(b)5114gTc300 seriesTc200 seriesTm049xa seriesTm049xa 3617b a 4056ca

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