TC/TM SERIES 2-Cycle Engines - Small Engine Suppliers

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Paper Filter Removal and Replacement1. Remove the polyurethane pre-filter (if equipped) fromthe air filter.2. Inspect the filter(s) for discoloration or dirtaccumulation. (For the polyurethane pre-cleanerservice see step # 5 under "Polyurethane FilterRemoval and Service"). If either condition is present,replace the paper type filter using the following steps.3. Loosen the clamp and slide the clamp toward the airfilter (diag. 2-3).4. Slide the air filter and clamp off the carburetoradapter. Discard the old filter and keep the clamp.5. Apply a thin layer of silicon sealant to the outside ofthe air cleaner adapter.6. Install the clamp on the new air filter, slide the filterassembly onto the carburetor adapter as far as it willgo.7. Slide the clamp as close to the carburetor as possible.Tighten the clamp securely.Polyurethane Filter Removal and ServiceHose ClampScreen APoly Pre-FilterAir CleanerClampCarburetor AdapterCarburetorScreen B2-3Kleen Aire® Air Cleaner, TC Type II or TM1. Remove the cover by pulling outward on the tab (diag.2-4). On the TC Type II/TM style engine, loosen thetwo screws (diag. 2-5).2. Remove screen A (if equipped), foam filter andscreen B from the air cleaner body (diag. 2-4). On TCType II/TM engines, remove the flocked screen andthe foam filter (diag. 2-5).3. Inspect the flocked screen and foam filter fordiscoloration or dirt accumulation. If either condition ispresent, service the element or screen using thefollowing steps.4. The flocked screen pre-filter may be cleaned byblowing compressed air through the screen from theback side. Replace the screen if this procedure doesnot fully remove the accumulated particles.5. Wash the polyurethane filter or polyurethane pre-filter(used with paper air filters) in a detergent watersolution and squeeze (don't twist) until all dirt isremoved.6. Rinse the polyurethane filter or polyurethane pre-filterthoroughly in clean water. Wrap the filter in a cleancloth and squeeze (don't twist) until completely dry.7. Reassemble the filter assemblies per the illustrations.TC TYPE II/TMAir CleanerHousingPolyurethane FilterPoly Air-CleanerFlocked ScreenLock NutWasherFuel Tank2-4Air Cleaner CoverCover Screw2-510
CHAPTER 3 CARBURETORS AND FUEL SYSTEMSGENERAL INFORMATIONTC/TM engines almost exclusively use diaphragm-type carburetors to be able to run effectively at any operating angle.The diaphragm carburetors are produced by Tecumseh, Walbro and Tillotson for Tecumseh. The carburetors use aninternal diaphragm fuel pump to supply the fuel to the carburetor fuel metering chamber. The metering diaphragm hasone side exposed to intake manifold pressure and one side exposed to atmospheric pressure. This diaphragm providesthe same basic function (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. Consultthe Two Cycle Technician's Handbook (part # 692508) if service is required on this series of carburetor.When servicing carburetors, use the engine model andspecification number to obtain the correct carburetor partnumber. An alternate method to find the correctcarburetor part number is to use the manufacturingnumber and date code stamped on the carburetor andconvert this number to a part number. In the carburetorsection of the Master Parts Manual, Microfiche Catalog, orElectronic Parts Catalog, a cross reference chart willconvert a carburetor manufacturing number to aTecumseh part number. When using computer parts lookup system, it is only necessary to enter this information inthe search box using prefix OK for Tecumseh carburetors,WA or WTA for Walbro carburetors or HU for Tillotsoncarburetors (diag. 3-1).OPERATIONIn the "CHOKE" or "START" position, the choke shutter isclosed, and the only air entering the engine flows throughopenings around the choke shutter. As the recoilassembly is operated to start the engine, upward pistontravel creates a low pressure area in the crankcase. Highpressure atmospheric air rushes into the crankcase to fillthe created low pressure area. Since the majority of the airpassage is blocked by the choke shutter, a relatively smallquantity of air enters the carburetor at increased speed.The main nozzle and both idle fuel discharge ports aresupplying fuel due to the low air pressure in the intake ofthe engine and the fuel side of the main diaphragm.Atmospheric air pressure on the opposite side of the maindiaphragm forces the diaphragm upward, depressing theinlet control lever, overcoming inlet spring pressure andallowing fuel to enter the fuel chamber through the inletvalve. A maximum fuel flow through the carburetor orificescombined with the reduced quantity of air that passesthrough the carburetor, make a very rich fuel mixturewhich is needed to start a cold engine (diag. 3-2).FuelImpulseIntake AirEngine VacuumStart3-13-211
Page 1: TECUMSEHT E C H N I C I A N ‘ SH
Page 4 and 5: CHAPTER 6 IGNITION ................
Page 6 and 7: I. Operate Equipment SafelyOperatio
Page 8 and 9: I. TC200 ModelsA sample TC200 decal
Page 10 and 11: FUEL REQUIREMENTSTecumseh Power Com
Page 12 and 13: STORAGE (IF THE ENGINE IS TO BE UNU
Page 16 and 17: At IDLE the throttle shutter is alm
Page 18 and 19: TILLOTSON CARBURETOR1. Diaphragm Co
Page 20 and 21: ENGINE TROUBLESHOOTINGEngine Will N
Page 22 and 23: TROUBLESHOOTING CARBURETION—TC/TM
Page 24 and 25: CARBURETOR DISASSEMBLY1. Note or ma
Page 26 and 27: 10. Install the choke and throttle
Page 28 and 29: FUEL TANK SERVICETC Type II/TM engi
Page 30 and 31: TROUBLESHOOTINGENGINE OVERSPEEDING1
Page 32 and 33: GENERAL INFORMATIONCHAPTER 5 REWIND
Page 34 and 35: GENERAL INFORMATIONCHAPTER 6 IGNITI
Page 36 and 37: TESTING1. After repeated efforts to
Page 38 and 39: COMPONENTS1. CYLINDER2. "G" CLIP3.
Page 40 and 41: TROUBLESHOOTING ENGINE OPERATION PR
Page 42 and 43: 4. Check the flywheel key for parti
Page 44 and 45: 17. Turn the crankshaft to the 90°
Page 46 and 47: 10. Use a piston and rod holder (di
Page 48 and 49: 6. Remove the rewind starter assemb
Page 50 and 51: 7. Clean both gasket surfaces using
Page 52 and 53: CHAPTER 8ENGINE SPECIFICATIONS ANDS
Page 54 and 55: SEARS CRAFTSMAN CROSS REFERENCE143.
Page 56 and 57: TOOLSFLYWHEEL PULLER 670299STRAP WR
Page 58 and 59: SEAL PROTECTOR AND INSTALLER 670275

TC/TM SERIES 2-Cycle Engines - Small Engine Suppliers

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