Can’t find your part?   Contact us:
+1-309-603-4777
Sears Parts Direct
Orders

  • Keep track of the models you own in your profile

    Sign in or Register to view or add models

Schedule a repair
Tecumseh
Lawn & Garden Engine

Model # TYPE 643-21 Official Tecumseh engine

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

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 123 parts  |
O-ring 631028
#25

Carburetor no. 631899 diagram

O-ring

Part #631028

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

/carb Float 631023
#14

Carburetor no. 631899 diagram

/carb float

Part #631023

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

Clip 631022
#13

Carburetor no. 631899 diagram

Clip

Part #631022

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

Seal 510105
#26

Basic engine diagram

Seal

Part #510105

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

Retainer 510106
#27

Basic engine diagram

Retainer

Part #510106

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

Spring 510109
#28

Basic engine diagram

Spring

Part #510109

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

Dog Sprng Rh 590412
#5

Rewind starter no. 590420 diagram

Dog sprng rh

Part #590412

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

Nut 650390
#50

Basic engine diagram

Nut

Part #650390

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

Coil 30560A
#11

Magneto no. 610832a diagram

Coil

Part #30560A

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

Piston 310230
#5

Basic engine diagram

Piston

Part #310230

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.

View all

Why won't my pressure washer mix in the detergent?

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

Read more

Why is smoke coming from the pressure washer's exhaust?

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

Read more

Why won't the pressure washer starter rope retract?

Main causes: broken recoil spring, damaged recoil starter…

Read more

Why does my pressure washer's engine lose power?

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

Read more

Why is the spray from my pressure washer weak?

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

Read more

Why doesn't my pressure washer recoil starter work?

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

Read more

Why does my pressure washer spray too hard?

Main causes: faulty unloader valve, bad pressure regulator…

Read more

Why won't my pressure washer engine start?

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

Read more

Why does water spray out of my pressure washer's pressure relief valve?

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

Read more

Repair guides for gas pressure washers

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

View all
How to install a pressure washer check valve kit

How to install a pressure washer check valve kit

Air in the inlet water supply can damage the check valves. If the pump won’t build up pressure due to damaged check valv…

Read more
Repair difficulty
Time required
 120 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…

Read more
Repair difficulty
Time required
 45 minutes or less
How to install a pressure washer chemical injection kit

How to install a pressure washer chemical injection kit

The chemical injection valve draws detergent into the pump. If it’s not drawing detergent, use a repair kit to replace t…

Read more
Repair difficulty
Time required
 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.

View all
Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

Read more
What are the main components of a lawn mower?

What are the main components of a lawn mower?

Learn about the main parts of a lawn mower and when to replace parts.…

Read more

Parts & More