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Model # TYPE 643-20C Official Tecumseh engine
Here are the diagrams and repair parts for Official Tecumseh TYPE 643-20C engine, as well as links to manuals and error code tables, if available.
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TYPE 643-20C Engine
#25
Carburetor diagram
O-ring
Part #631028
The manufacturer no longer makes this part, and there's no substitute part
#14
Carburetor diagram
/carb float
Part #631023
The manufacturer no longer makes this part, and there's no substitute part
#43
Basic engine diagram
Cover
Part #610118
The manufacturer no longer makes this part, and there's no substitute part
#59
Basic engine diagram
Spring
Part #630766
The manufacturer no longer makes this part, and there's no substitute part
#5
Rewind starter diagram
Dog sprng rh
Part #590412
The manufacturer no longer makes this part, and there's no substitute part
#26
Basic engine diagram
Seal
Part #510105
The manufacturer no longer makes this part, and there's no substitute part
#22
Basic engine diagram
Gasket
Part #510282
The manufacturer no longer makes this part, and there's no substitute part
#5
Basic engine diagram
Piston
Part #310230
The manufacturer no longer makes this part, and there's no substitute part
#3
Rewind starter diagram
Brake spring
Part #590411
The manufacturer no longer makes this part, and there's no substitute part
#6
Basic engine diagram
Pistn rng st
Part #310190
The manufacturer no longer makes this part, and there's no substitute part
Symptoms for band saws
Choose a symptom to see related band saw repairs.
Main causes: damaged rubber tire, worn wheel bearings, loose blade tension, dull saw blade…
Main causes: dull blade, using the wrong type of blade, feeding work piece to quickly, loose blade tension…
Main causes: angle indicator needs adjustment, dull blade…
Main causes: dull blade, improper feeding, loose blade tension, not using a work piece guide…
Main causes: broken saw blade, bad drive belt, damaged rubber tire…
Main causes: dull blade, using the wrong type of blade, weak drive motor…
Main causes: lack of electrical power, broken power cord, bad on/off switch, faulty drive motor…
Repair guides for band saws
These step-by-step repair guides will help you safely fix what’s broken on your band saw.
How to replace a band saw on-off switch
If the switch won't turn the band saw on or off, it could be defective. Replace the switch, using these steps.…
Repair difficulty
Time required
15 minutes or less
How to replace a band saw drive belt
If the motor runs but the blade doesn't move, it could be that the drive belt is broken. Here's how to replace it.…
Repair difficulty
Time required
15 minutes or less
How to replace a band saw blade
If the saw blade is dull or damaged and isn't cutting cleanly, replace the blade following these steps.…
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 band saw.
Get answers to frequently asked questions about Sears and Sears PartsDirect.…
Learn about the main parts of a lawn mower and when to replace parts.…