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Tecumseh TYPE 643-21A engine

Tecumseh TYPE 643-21A engine Parts

Here are the diagrams and repair parts for Tecumseh TYPE 643-21A engine, as well as links to manuals and error code tables, if available.

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Browse Parts for TYPE 643-21A Engine

  • Carburetor for Tecumseh TYPE 643-21A - Part 631899

    Basic engine diagram

    Carburetor

    Part #631899

    The manufacturer no longer makes this part, and there's no substitute part

  • Crankshaft for Tecumseh TYPE 643-21A - Part 290446

    Basic engine diagram

    Crankshaft

    Part #290446

    The manufacturer no longer makes this part, and there's no substitute part

  • Terminal for Tecumseh TYPE 643-21A - Part 610836

    Basic engine diagram

    Terminal

    Part #610836

    The manufacturer no longer makes this part, and there's no substitute part

  • Piston Pin for Tecumseh TYPE 643-21A - Part 310178

    Basic engine diagram

    Piston Pin

    Part #310178

    The manufacturer no longer makes this part, and there's no substitute part

  • Pin Centring for Tecumseh TYPE 643-21A - Part 590459

    Rewind starter diagram

    Pin Centring

    Part #590459

    The manufacturer no longer makes this part, and there's no substitute part

  • Rod Spring for Tecumseh TYPE 643-21A - Part 570406

    Basic engine diagram

    Rod Spring

    Part #570406

    The manufacturer no longer makes this part, and there's no substitute part

  • Condenser for Tecumseh TYPE 643-21A - Part 30548A

    Magneto diagram

    Condenser

    Part #30548A

    The manufacturer no longer makes this part, and there's no substitute part

  • Bearing for Tecumseh TYPE 643-21A - Part 530105

    Basic engine diagram

    Bearing

    Part #530105

    The manufacturer no longer makes this part, and there's no substitute part

  • Washer for Tecumseh TYPE 643-21A - Part 610385

    Magneto diagram

    Washer

    Part #610385

    The manufacturer no longer makes this part, and there's no substitute part

  • Washer for Tecumseh TYPE 643-21A - Part 650761

    Basic engine diagram

    Washer

    Part #650761

    The manufacturer no longer makes this part, and there's no substitute part

Symptoms for gas pressure washers

Choose a symptom to see related pressure washer repairs.

Main causes: overfilling engine with oil, improper fuel/air mixture, choke system problems, dirty carburetor, engine nee…

Main causes: dirty air filter, stale fuel, clogged or dirty carburetor, bad unloader valve…

Things to do: tune up the engine, inject pump saver into the water pump when storing the pressure washer for the winter…

Main causes: pump running for more than 5 minutes when the spray wand isn't being used, faulty pressure relief valve, ba…

Main causes: faulty unloader valve, bad pressure regulator…

Main causes: damaged recoil starter, oil inside cylinder, locked up engine piston…

Main causes: insufficient water supply, clogged water inlet screen, clogged pressure hose, faulty pump check valves, stu…

Main causes: stale fuel, gummed up carburetor, engine needs tune up, throttle and choke controls need adjustment, bad re…

Main causes: using a high-pressure spray tip when applying detergent, clogged siphon tube, chemical injection system fai…

Repair guides for gas pressure washers

These step-by-step repair guides will help you safely fix what’s broken on your pressure washer.

How to replace a pressure washer pump

How to replace a pressure washer pump

The pump can be damaged by air in the inlet water supply or by chemicals that remain in the pump body after using the ch…

Repair time and Difficulty

 15 minutes or less
How to install a pressure washer O-ring kit

How to install a pressure washer O-ring kit

O-rings seal fittings on the pressure washer pump. Damaged seals allow water to leak from the pump. Follow these steps t…

Repair time and Difficulty

 45 minutes or less
How to replace a pressure washer unloader valve

How to replace a pressure washer unloader valve

The unloader valve recirculates water to protect the pump from damage. If the unloader valve is defective, replace it us…

Repair time and Difficulty

 15 minutes or less

Effective articles & videos to help repair your lawn & garden engines

Use the advice and tips in these articles and videos to get the most out of your pressure washer.

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Top questions about Sears and Sears PartsDirect

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