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Using the Tecumseh Carburetor 632774 this page will cover basic repair tasks to get your Tecumseh Carburetor back in shape.

TECUMSEH CARBURETOR 632774

Things to consider prior to making any repair on a Tecumseh Carburetor-


Is the Tecumseh Carburetor worth repairing?
How much does a new Tecumseh Carburetor cost new?
If the time and parts to repair a Tecumseh Carburetor
exceeds half or more of the price of a new carburetor,
you should consider buying a new Tecumseh Carburetor.
What is your time worth? If you want to learn and have the time, then go for it, repair the carburetor and have fun doing so.
When it becomes frustrating for any reason,
you will be more satisfied with your decision to
just put on a new Tecumseh Carburetor.
This may sound like a sales pitch for a new Tecumseh Carburetor,
but this is the same decision process we use in our repair shop.
If it will take more time and cost of parts to repair a
Tecumseh Carburetor than the cost of a new one,
we simply put on a new Carburetor.
If you are taking your mower into a repair shop, be sure
and ask them to apply the same decision method.
If you know a new Tecumseh Carburetor is priced under $60.00
you may want to consider asking the repair shop to just
put on a new Tecumseh Carburetor for you verses trying to
make the old one work. The shop may charge you for more time
trying to make the old one work, then turn around and charge you
for a simple installation of a New Tecumseh Carburetor after they
realize they can't make the old one work.

While the pictures shown below are for a Tecumseh Carburetor 632774
the pictures do represent an Adjustable Jet Tecumseh Carburetor.

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Air Inlet view of the Tecumseh carburetor 632774


Prior to repairing the Carburetor, inspect the inlet of the Carburetor.
Do you see signs of dirt? Any signs of dirt is a clue that your air filter
has failed to filter out the dirt.
You may have internal damage due to dirt injestion.
This is another decision to be made.
If your engine is damaged due to dirt injestion,
will the engine be worth the repair? In either case,
if dirt is present, you should investigate the reason why this happened.

FLOAT ISSUES AND REPAIR

Is fuel dripping out through the air inlet? The inlet needle valve may be leaking. If you remove the bowl, check the float to see if it has any fuel inside the float. If your float is a metal float, shake the float and listen. Can you hear any liquid shaking around inside the float? If so, that may be part of your problem. If the float "sinks" inside the float bowl, it will constantly let fuel enter the carburetor without shutting off the fuel. The float must "float" on top of the fuel while fuel is inside the bowl. If it has fuel inside the float, it will be heavy and will sink. If your float is clear plastic, you can see the fuel inside the float. In either case, replace the float.

INLET NEEDLE VALVE ISSUES AND REPAIR



Figure 1.

If the float is not sinking, then you may have a leaking inlet needle valve or seat. This valve is inside the fuel inlet port of the carburetor. You must remove the float to get to the inlet needle. Under the needle is a seat. Most of the times, Tecumseh uses a small rubber donut type of seal for sealing the tip of the needle. If this seat is installed improperly it will leak around the needle tip. If it is swolen, it will pinch off the fuel flow not letting fuel enter the float chamber. If you remove the seat, install a new one. The inlet seat must be installed properly for it to work correctly (see figure 1).

Special note:

If you are transporting any machine in car, truck, or trailer, you should shut off the fuel valve so the carburetor will not leak.
As a machine riding in the back of a truck or trailer "bounces" around, it will cause th float inside the carburetor to also bounce and this up and down motion will permit the inlet needle to rise up and down, subsequently allowing excess fuel to enter the carburetor. Shut off the fuel inlet valve to prevent from happening.

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Fuel Inlet of the Tecumseh Carburetor 632774


Is the fuel inlet clogged with trash from the fuel line?
Sometimes the Carburetor does not require repair, it is simply no fuel is getting into the Tecumseh Carburetor. Some Tecumseh Engines have a fuel filter between the fuel tank and the Carburetor. Just because there is a filter in the fuel line does not mean you can not have something preventing fuel flow into the Carburetor. A piece of the rubber fuel line can break of inside the fuel line and enter the fuel inlet of the Carburetor blocking partially or completely the required fuel flow into the Carburetor. Remove the fuel line and look into the inlet. If you find something, a complete repair may not be necessary. Try removing the obstruction prior to opening the carburetor, disturbing the bowl seals.

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The Throttle Plate Tecumseh Carburetor 632774


Has the Throttle Plate come off the Carburetor? Is one of the two screws missing? We have seen plates that have fallen off. This can be inspected sometimes with the carburetor still installed. If either or both of the screws are missing, they possibly are inside the valve train. We have seen a screw hold open one of the valves. You should find the screw if missing. Most likely it is inside the air and fuel flow circuit of the engine. You won't find it in the crankcase, the piston and rings will prevent passage of somethng that small from entering the crankcase.

Main Jet adjustment Tecumseh Carburetor 632774


Is the Main Jet simply out of adjustment? This adjustable jet adjusts the amount of fuel entering the air flow. Too much fuel will cause it to run rough and rich, possibly with black smoke coming from the muffler. Not enough fuel will cause it to run lean and rough. A good adjustment position somewhere between rich and lean is a smooth running engine. If your air filter is clogged, that will cause an engine to run rich, perhaps you don't need to adjust your Carburetor, you simply need to change out your air filter. An air filter can collect dirt and oil. Yes, Oil. If you have a paper element air filter, and oil gets on the paper, this will cause an engine to run rich. Did you lean your equipment over on its side? Did oil get onto the air filter? Does the engine run smootly with the air filter off? If it does something is wrong with the air filter.

If none of the items above have provided clues as to a possible Tecumseh Carburetor Problem, then you may have to remove the Carburetor and inspect the inside areas.

The bottom bowl is the first place to start.
Remove the bottom bowl by removing the Jet from the bottom of the bowl.
The only thing holding the bowl on then will be a locking seal formed by the bowl ring seal at the top of the bowl. Twist or tilt the bowl and it will come right off. ALWAYS REPLACE THE BOWL SEAL.

REFERENCE
NUMBER
TECUMSEH
PART NUMBER
DESCRIPTION

This image is for illustration only, may not be exact.
632774 TECUMSEH CARBURETOR COMPLETE
1 632649 THROTTLE SHAFT AND LEVER ASSY.
1A 36288 BUSHING
2 632685 THROTTLE RETURN SPRING
4 631184 DUST SEAL WASHER
5 631183 DUST SEAL (THROTTLE)
6 632517 THROTTLE SHUTTER
7 650506 SHUTTER SCREW
10 632472 CHOKE SHAFT AND LEVER ASSY.
11 632473 CHOKE RETURN SPRING
12 631184 DUST SEAL WASHER
13 631183 DUST SEAL (CHOKE)
14 632429A CHOKE SHUTTER
16 632527 FUEL FITTING
17 651025 THROTTLE CRACK SCREW/IDLE SPEED SCREW
18 630766 TENSION SPRING
20 632281 IDLE MIXTURE SCREW
21 630766 TENSION SPRING
22 630739 IDLE MIXTURE SCREW WASHER
23 630740 IDLE MIXTURE SCREW "O-RING"
25 631867 FLOAT BOWL ASSY.
27 631024 FLOAT SHAFT
28 632019 FLOAT
29 631028 FLOAT BOWL "O-RING"
30 631021 INLET NEEDLE, SEAT AND CLIP
(INCLUDES 31)
31 631022 SPRING CLIP
40 632239 MAIN ADJUSTMENT
(INCLUDES 41 THRU 44)
41 630740 O-RING
42 630739 WASHER
43 630738 SPRING
44 27110A BOWL NUT WASHER
47 630748 WELCH PLUG
48 631027 WELCH PLUG
60 632760 REPAIR KIT

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This web site has been made available to you for the enhancement of the services we provide to our customers. We have provided a number of resources here to help you resolve TECUMSEH CARBURETOR problems, find TECUMSEH CARBURETOR parts you need, and suggest improvements to our service OF PROVIDING INFORMATION FOR REPAIRING OR BUYING TECUMSEH CARBURETORS ONLINE.

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Last modified: DECEMBER 12, 2014

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