Tecumseh tc II backfire
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Category: Home Improvement
Forum Name: Lawn and garden equipment
Forum Discription: questions and answers on power equipment
URL: http://www.neo-forum.com/forum_posts.asp?TID=9110
Printed Date: November/30/2023 at 1:39am
Topic: Tecumseh tc II backfire
Posted By: Guests
Subject: Tecumseh tc II backfire
Date Posted: November/03/2005 at 4:38pm
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My tecumseh tc300 will only accelerate successfully with the choke half closed. If the choke is open and I accelerate the engine pops and then stalls or tries to stall. I don't know if this is a normal thing but the engine starts and runs with the needle valve screw completely seated.
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Replies:
Posted By: donp
Date Posted: November/04/2005 at 2:55am
back the screw out 1 1/2 turns then adjust once warmed up.
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Posted By: Guests
Date Posted: November/04/2005 at 2:40pm
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I did that already to no avail.I read one of the other postings and saw that you had suggested that.The best adjustment that I could get was with the choke half closed.I took the carb apart and ran a wire through every hole that I could get to. Are there any things that would be visably obvious inside the carburator? I pulled the stone type filter out of the gas tank and it seemed to be free and clear. Any other suggestions?
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Posted By: donp
Date Posted: November/05/2005 at 2:39am
well the only reason it runs with the choke on is because there is a fuel restriction somewhere, or an air leak. 9 times out of 10, its in the carb. that stone in the gas tank is a fuel filter. make sure it is clean and fuel flows thru it freely.from there follow the gas line to be sure its not kinked, or soft enough that it just about sucks itself shut when the engine runs. go back thru the carb again with a piece of wire and follow up with carb cleaner. there's a lot of small holes in the venturi, make sure you go thru them all. if its a walbro carb with one large screw on the side of the carb where the gas line connects, you should see a silver colored mesh filter about the size of a crayons diameter. pull it out. it may be bad.
check the intake manifold to make sure its tight. check the head bolts and cylinder base gasket. and make sure the muffler is mounted tightly, and is in good working condition.
and post the model and serial number so that i can have a better idea of what you have.
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Posted By: Guests
Date Posted: November/05/2005 at 2:49pm
My model# is tc300-3008c-0180g
I found a parts breakdown online for the carburetor.
When I took the carburetor apart I noticed that it does not appear to have part #24 (gasket-metering diaphragm). It looks to be a gasket between the Carburetor body and the diaphragm. Here is the address for the parts breakdown for my Walbro wts-4b carburetor. http://www.wem.walbro.com/walbro/product.asp?CategoryName=Ice+Auger&Series=WTA&partnum=WTA%2D4%2D1&GroupName=Ice%20Auger&FamilyName=TECUMSEH
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Posted By: donp
Date Posted: November/06/2005 at 2:21am
for some reason the server at empart is down and i cant access any breakdowns, and your link does not work either. so i'm gonna give my best guess here for now.
if that gasket is indeed missing, that would cause you to have a problem. i've never seen a walbro carb come without the gasket, and without it, it would cause the engine to flood rather than need to be run with the choke. so, chances are the gasket is there, its just stuck to the diaphragm. they always get stuck together. look at it very closely.
but if your talking about the fuel pump side of the carb, that would cause a lean situation as the flaps on the diaphragm would not have room to open up. but again i've never seen a walbro come without that gasket either. and these two parts do stick together as well.
when you say metering diaphragm, i'm assuming your talking about the diaphragm under the cover with 4 small screws. and once i can access breakdowns again, i can answer this more logically and factual.
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Posted By: Guests
Date Posted: November/06/2005 at 9:03am
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Here is the site that has my carburetor breakdown again. I think I had somrthing typed wrong in the last posting. http://wem.walbro.com/walbro/product.asp?CategoryName=Ice+Auger&Series=WTA&partnum=WTA%2D4%2D1&GroupName=Ice%20Auger&FamilyName=TECUMSEH
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Posted By: donp
Date Posted: November/06/2005 at 3:30pm
odd. the breakdowns for that engine show it using a float type carb.
http://wssemw.arinet.com/Empartweb52/scripts/EmpartISAPI52.dll?MF
check the diaphragm closely to be sure the gasket is not stuck to it.
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Posted By: Guests
Date Posted: November/06/2005 at 3:53pm
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I took it apart again and there is only the rubber diaphragm between the carb body and the cover. This particular carb is for an ice auger motor. I don't know if that makes it unique. Do you think that the gasket could be the problem?
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Posted By: Guests
Date Posted: November/06/2005 at 5:05pm
I couldn't get to your link. Maybe there's a typo like mine.
http://wssemw.arinet.com/Empartweb52/scripts/EmpartISAPI52.dll?MF
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Posted By: donp
Date Posted: November/07/2005 at 2:26am
the empart site is having some problems. they changed the format all around and its horrible to navigate. i copy/pasted the link so i dont know why its not working. but yes, if that gasket is missing it may cause the problems you are having. it could be sucking air in around the diaphragm.
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Posted By: GeneB
Date Posted: November/07/2005 at 6:43am
Air-sucking means a poor seal, no?
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Posted By: donp
Date Posted: November/07/2005 at 11:20am
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