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Tecumseh TYPE 643-21 engine Parts
Here are the diagrams and repair parts for Tecumseh TYPE 643-21 engine, as well as links to manuals and error code tables, if available.
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Browse Parts for TYPE 643-21 Engine
Carburetor no. 631899 diagram
Screw Assembly
Part #631271
The manufacturer no longer makes this part, and there's no substitute part
Rewind starter no. 590420 diagram
/start Rope
Part #590386
The manufacturer no longer makes this part, and there's no substitute part
Carburetor no. 631899 diagram
Bowl
Part #631700
The manufacturer no longer makes this part, and there's no substitute part
Basic engine diagram
Cntrl Lvr St
Part #570468
The manufacturer no longer makes this part, and there's no substitute part
Basic engine diagram
Bearing
Part #530105
The manufacturer no longer makes this part, and there's no substitute part
Rewind starter no. 590420 diagram
Pin Centring
Part #590459
The manufacturer no longer makes this part, and there's no substitute part
Basic engine diagram
Idle Adj Rod
Part #570425
The manufacturer no longer makes this part, and there's no substitute part
Basic engine diagram
Control Bracket
Part #570469
The manufacturer no longer makes this part, and there's no substitute part
Screw
Part #650618
The manufacturer no longer makes this part, and there's no substitute part
Carburetor no. 631899 diagram
Flap Valve
Part #631555
The manufacturer no longer makes this part, and there's no substitute part
Symptoms for gas snowblowers
Choose a symptom to see related snowblower repairs.
Main causes: stale gas, clogged carburetor, clogged or broken fuel line, dirty spark plug, bad rewind starter, incorrect…
Main causes: punctured tire, damaged rim…
Main causes: snow build-up in chute, chute drive mechanism failure, bad chute control assembly…
Main causes: clogged chute, damaged auger blades, broken shear pins, worn auger belt, damaged gear case, engine problems…
Things to do: replace the spark plug, change the oil, rebuild the carburetor, adjust valve lash, adjust or replace the b…
Main causes: dirty carburetor, stale fuel…
Main causes: clogged chute, snow build-up in auger housing, broken auger shear pins, auger drive belt needs adjustment, …
Main causes: broken shear pins, worn or loose auger drive belt, auger drive cable failure, damaged auger, bad gear case…
Main causes: loose drive clutch cable, damaged drive clutch cable, worn friction disc, scraper blade scraping the ground…
Repair guides for gas snowblowers
These step-by-step repair guides will help you safely fix what’s broken on your snowblower.
How to adjust snowblower skid shoes
To prevent snowblower auger and shave plate damage, adjust the skid shoes regularly to keep the shave plate ¼-inch high.…
Repair time and Difficulty
15 minutes or less
How to rebuild a snowblower carburetor
Rebuild the carburetor on your snowblower if the engine isn't getting fuel.…
Repair time and Difficulty
45 minutes or less
How to replace a snowblower 4-way chute control assembly
Replace the 4-way chute control assembly on your snowblower if it’s damaged.…
Repair time and Difficulty
30 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 snowblower.
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.…
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