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James W
James W, Small Engine Troubleshooting Expert
Category: Small Engine
Satisfied Customers: 3700
Experience:  7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
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I have a Sears Eager 1 lawn mower with a Tecumseh engine. It

Resolved Question:

I have a Sears Eager 1 lawn mower with a Tecumseh engine. It starts strong, runs for about 3~5 seconds and dies. It appears to be getting gas with no issue. I think the governer or linkage and spring placement may be the issue. Any ideas?
Submitted: 5 years ago.
Category: Small Engine
Expert:  James W replied 5 years ago.

These engines made by tecumseh but restricted by sears didn't get gas with no issue when they were working right...

 

If it is the model I expect, it has a NON adjustable carburetor..

 

This is why they had so much trouble burning exhaust valves. They had lots of power (at first), but they always ran lean...

 

If you had said it ran for 10 minutes then I would say something else (liek check your gas cap vent or the magnito was breaking down with heat).

 

BUT,

 

As they sit, fuel that is left in the carburetor can turn to gum and varnish and cause this and other problems.

Also, any gasoline that was left in a gas can for a period of more than 30 days must be discarded because it also has begun to turn to varnish.

More than 70% of all of our repairs in our lawn mower business are due to this same issue. You most likely have dirt, gum, varnish...etc in your carburetor plugging up the small passageways and jets in the carb. It Must be removed from the engine, cleaned very well, the tiny passages ways and holes probed with a tiny stiff wire, blown out with compressed air and reassembled using a NEW carburetor rebuild kit.

ALWAYS clean the fuel tank and replace the fuel line when doing this repair or you may have to do it all over again. The inside of the fuel line disintegrates over time and these small pieces of rubber will plug up the carb too. Dirt and water from a dirty fuel tank will also plug up the carb. Find the Model, type and serial or code numbers off of the engine and take them to your local dealer to get the carb kit.

 

You could also have the CHOKE misadjusted.

Customer: replied 5 years ago.

I rebuilt the carb yesterday with a new kit. It is the non adjustable as you guessed. I cleaned all the passageways as well. Playing with the governor (which I know I'm not supposed to do) can get it to run at an extremely low rpm without dying but nothing like the rpm that would be expected or needed for proper operation. Can you offer any further ideas?

 

Thanks,

Mike

Expert:  James W replied 5 years ago.

How is the compression.?.

 

Do you have a way to test it?

 

WHen you pull the rope, does it have kind of a swoosh swoosh hissing sound when you pull the rope.

 

I wonder if it is a valve problem?

 

 

 

Customer: replied 5 years ago.
When the rope is pulled it acts like another craftsman mower I have (only w/ a briggs and stratton eng.) a slight resistance then start. Again, I suspect sring or linkage to the governer or governor itself to be the problem. The normal byways don't have anyone who knows the placement of the two, but it seems pretty apparent based on the relationship to everything (and each other) where they go. The mower was reworked by someone else and the positions where placed back in the identical locations, however as I'm sure you're aware it doesn't mean they were right in the first place. Seems like a mower that is strong and ready to run, just some piece of info missing.
Expert:  James W replied 5 years ago.

After careful disassembly of the carburetor and the removal of all non metallic parts, the carburetor body and all other

metallic parts should be cleaned with solvent, or commercial carburetor cleaner, no longer than 30 minutes. Use compressed

air and soft tag wire to clean internal carburetor passages. To do a proper cleaning job, the welch plugs must be removed

to expose the drilled passages.

NOTE: The nylon check balls used in some diaphragm carburetors are not serviceable. Nylon can be damaged if

subjected to harsh cleaners for prolonged periods.

 

Examine the throttle lever and shaft, choke lever and shaft, and carburetor body at the bearing points and holes into

which the linkage is fastened, and replace if worn or damaged. Any looseness in these areas can cause dirt to enter the

engine and cause premature wear. If dust seals are present, these should be positioned next to the carburetor body.

 

Idle and High Speed Mixture Adjusting Screw

 

Examine the idle mixture needle tip and tapered surface

for damage. The tip and tapered surface of the needle must

not show any wear or damage at all. If either is worn or

damaged, replace the adjusting needle. Tension is

maintained on the screw with a coil spring. Examine and

replace the "O" ring seal if damaged (diag. 40).

Examine the tapered surface of the high speed mixture

needle. If the tapered surface is damaged or shows wear,

replace the needle (non-emissioned). Some Tecumseh

carburetors use serviceable jet main nozzles. These are

identified as being non-metallic.

Fuel Bowl Retaining Nut

 

The retaining nut contains the transfer passage or metering

jet through which fuel is delivered to the high speed and

idle circuit of the carburetor. If a problem occurs with the

RETAINER NUT

SPRING

"O" RING

HIGH SPEED

ADJUSTMENT SCREW

BRASS WASHER (used to protect the

"O" ring from the spring)

40

ONE-HOLE TYPE TW0-HOLE TYPE

FUELMETERING

PORT

FUEL-INLET

PORTS

41

IDLE FUEL

TRANSFER

PASSAGE

idle circuit, examine the small fuel passage in the annular groove in the retaining (metering) nut. This passage must

be clean for the proper transfer of fuel into the idle metering circuit. Torque retaining nut to 50 in. lbs. (5.65 Nm) when

reinstalling.

There are two different types of bowl nuts that are used on adjustable main, float style carburetors. One type has one fuel

metering port at the bottom of the nut, and the other has two fuel inlet ports at the bottom of the nut. This difference

relates to calibration changes to the carburetor and is dependent on the application (diag. 41).

NOTE: DO NOT INTERCHANGE BOWL NUTS.

The fuel inlet ports must be free of any debris to allow proper fuel flow.

Fuel Bowl, Float, Needle and Seat

 

The float bowl must be free of dirt and corrosion. Clean with solvent or carburetor cleaner.

Examine the float for damage. Check the float hinge bearing surfaces for wear, as well as the tab that contacts the inlet

needle. Replace any damaged or worn parts.

The needle and seat should be replaced if any fuel delivery problems are experienced (flooding or starvation). Sealing

problems with the inlet needle seat may not be visible, so replacement is recommended.

 

Diaphragms, Pulse Pumps, and Primer Bulbs

Inspect diaphragms, gaskets, and primer bulbs for cracks, tears, hardness or brittleness. Replace if necessary.

 

ASSEMBLY

Welch Plugs

To install a new welch plug after cleaning the carburetor,

secure the carburetor in a vise equipped with protective

jaws. Place the welch plug into the receptacle with the

raised portion up. With a punch equal to, or greater than

the size of the plug, merely flatten the plug. Do not dent or

drive the center of the plug below the top surface of the

carburetor. After installation of the welch plug, seal the

outer diameter with finger nail polish or equivalent (diag.

42).

Throttle Shaft and Plate

When reassembling, it is important that the lines or lettering

on the throttle plate are facing out when in the closed

position. Position throttle plate with two lines at 12 and 3

o'clock. If the throttle plate has only one line, the line should

be positioned in the 12 o'clock position on Series 1, 6, 8,

and 9 carburetors, and positioned in the 3 o'clock position

on Series 3 and 4 carburetors (diag. 43 & 44).

Test the operation of the throttle and return spring (if

equipped). If binding occurs, correct by loosening screws

and repositioning throttle plate.

Always use a new screw(s) when reinstalling the throttle

shutter (Tecumseh screws are treated with dry-type

adhesive to secure them in place).

NOTE: NEVER REUSE OLD SCREWS.

Choke Shaft and Plate

The choke plate is inserted into the air horn of the carburetor

in such a position that the flat surface of the choke is

down. Choke plates will operate in either direction. Make

sure it is assembled properly for the engine. Test the

operation of the choke and return spring function if equipped

(diag. 45).

Always use a new screw(s) when reinstalling the choke

shutter as the screws are treated with dry-type adhesive

to secure them in place.

NOTE: NEVER REUSE OLD SCREWS.

The choke shaft and plate must be in the closed position

prior to tightening the screws. Hard starting may be due to

insufficient choking action because of a misaligned choke

plate. Correct by readjusting the choke plate to close

completely. Note the cut-out position of choke shutter if

applicable.

Fuel Inlet Fitting

Support the carburetor body with a wood block to avoid

damage to other parts. Use a bench vise or press to install

the fitting squarely. Insert the tip into the carburetor body,

coat the exposed portion of the shank with Loctite grade

A, then press it in until the shoulder contacts the carburetor

body.

 

High and Low Speed Adjusting Screw, Main Nozzle

When reassembling, position the coil spring on the

adjusting screws, followed by the small brass washer and

the "O" ring seal. Turn the high speed adjustment screw

in approximately one turn into the bowl retainer nut to

make an assembly (diag. 47).

On 2-7 hp. engines that use carburetors which have the

metering rod in the idle circuit (carburetor should rattle when

shaking), make certain that the idle adjustment screw is

installed when the carburetor is in an upright position or

the needle will damage the metering rod, adjustment screw

and carburetor casting.

Some carburetors are of the fixed main type and would

not have a high speed adjusting screw.

Inlet Needle and Seat

On float type carburetors, make sure the seat cavity is

clean. Moisten the seat with oil and insert the seat with

the grooved side down and away from the inlet needle.

Press the seat into the cavity using a flat punch close to

the diameter of the seat, making sure it is firmly seated

(diag. 48).

The inlet needle hooks onto the float tab by means of a

spring clip. To prevent binding, the long, straight end of the

clip should face the air intake end of the carburetor as

shown (diag. 49).

On diaphragm carburetors the inlet needle and seat

assembly are installed by using a socket to tighten the

assembly until seated.

Needle and Seat Pop-Off Test

To test the pop-off pressure, remove the carburetor from

the engine. Be sure to drain any fuel into an approved

container. Invert the carburetor and remove the float bowl.

Place a drop of an oil based product such as WD-40 on

the tip of the needle valve. Using a commercially available

0-30 psi pump and gauge, attach the pumps hose to the

carburetor inlet. Apply approximately 6 psi or until the

needle pops off the seat. The needle should seat at 1.5 psi

or greater for a minimum of 5 minutes. If the minimum 1.5

psi cannot be maintained for this period of time, then service

to the needle and seat is required.

Float Installation

Reinstall the inlet needle and float into the carburetor. The

long end of the spring or clip on the inlet needle must point

toward the air intake end of the carburetor. If a float

dampening spring is used, reassemble using the following

steps (diag. 50).

HIGH SPEED

ADJUSTMENT SCREW

SPRING

RETAINER NUT BRASS WASHER

"O" RING

47

DRIVE IN UNTIL

SEAT RESTS ON

BODY SHOULDER

48

INSERT THIS

FACE FIRST

49

THROTTLE

END

OPEN END

OF CLIP

CLIP

LONG END

OF CLIP

CHOKE

END

5/32" FLAT PUNCH

SEAT

INLET NEEDLE

SEATS AT THIS

POINT

HINGE PIN

INLET SEAT

50

FLOAT SPRING

FLOAT

INLET NEEDLE

WASHER

1. Place the float upside down.

2. Position the spring on the float with the long end around and to the back side of the float's center back tang. The ends

must point toward the choke end of the carburetor. Hook the inlet needle clip on the inside float tang so the clip end

points to the choke end of the carburetor (diag. 50).

3. Place the float, float spring, clip and inlet needle in position between the hinge legs of the carburetor. As the float

assembly nears the hinge legs, wind the outside end of the spring so it goes to the outside of the leg (counterclockwise

looking from the choke end).

 

4. Install the hinge pin from the opposite hinge leg. The

bowl gasket must be positioned over the end of the

spring (diag. 51).

5. Set the proper float height. See "Float Adjusting

Procedure" in this chapter.

Diaphragm Assembly

The rivet head on the diaphragm must always face toward

the inlet needle valve. On carburetors with an "F" cast into

the carburetor flange as illustrated, the diaphragm goes

next to the carburetor body. Other diaphragm carburetors

have the gasket located between the diaphragm and

carburetor body. Install the cover retaining screws and

tighten (diag. 52).

Fuel Bowl And Bowl Nut

Whenever a carburetor bowl is removed for service, the

fuel bowl "O" ring must be replaced. For easier installation,

lubricate the "O" ring with a small amount oil.

Install the float bowl by placing the detent portion opposite

of the hinge pin. Make sure the deepest end of the bowl is

opposite of the inlet needle. The bowl has a small dimple

located in the deepest part. The purpose of this dimple is

to minimize the chances of the float sticking to the bottom

of the bowl caused by stale fuel (diag. 53).

On some fixed jet (non-adjustable) and adjustable

carburetors, a fibered washer is required between the

carburetor bowl and the bowl retaining nut.

Occasionally, on engines equipped with the dual system

carburetor, some rich starting conditions have occurred

when the engine is warm. This condition can be corrected

by inserting a non-metallic spacer in the center leg of the

carburetor, as shown (part # XXXXX). This spacer is

designed to reduce the amount of prime charge in the main

nozzle area for better starting under warm engine

conditions. It can only be used on Dual System carburetors

and does not lean out the carburetor mixture. (diag. 54)

This spacer must be reinstalled if originally equipped in

the carburetor.

 

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Above is a link to a service manual pdf file.. Chapter 4 will describe linkage with photos. Page 24.

 

 

James W, Small Engine Troubleshooting Expert
Category: Small Engine
Satisfied Customers: 3700
Experience: 7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
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