3.5HP Briggs & Stratton Moter Dose Not Work (Boggs Down)

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  #1  
Old 01-22-08, 02:15 PM
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Exclamation 3.5HP Briggs & Stratton Moter Dose Not Work (Boggs Down)

Every time I try to start up my old Craftsman mower with a 3.5hp Briggs & Stratton motor on it, it boggs down immediately. i have cleaned out the carb., put a new air filter on it, add new oil, put new gas in it and tryed to wash all of the dirt off of it. the throttle govnor is not stuck and moving and the piston has been cleaned off. no matter what i do, the thing wont start up!!!

The engine model number is: 143.374032


Can someone please help me?
Thanks,
Chris
 
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  #2  
Old 01-22-08, 03:31 PM
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The model number you posted is for a Tecumseh so here we go;
Clamp off the fuel line, remove the carb bowl, release the clamp to see if you have good fuel flow to the carb, raise the float to see that it shuts off the flow with minimal pressure, clean the junk from the bowl, clean the bowl nut, 2 holes close to the bottom and a tiny one about midway up(I usually use the wire from a twist tie), spray all holes, cracks and crevases with brake parts cleaner, reassemble and you should be good to go. If this didn't work it will be probably be necessary to rebuild the carb. If I missed something one of the real mechanics will post to help further. Refer to the photo below. Have a good one . Geo
http://i190.photobucket.com/albums/z...c_bowl_nut.jpg
 
  #3  
Old 01-22-08, 03:43 PM
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geo is right, you have a Tecumseh engine, TVS90-43354E.
How did you clean carb, spray can carb cleaner or soak in carb bath a couple of hours??
After you cleaned piston, did you clean gasket and reinstall head/gasket bolts in criss-cross fashion to 150 in. lbs.?
Could it use a new spark plug ?
thanks,
 
  #4  
Old 01-23-08, 12:37 PM
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I have replaced the pistion rings and cleaned off the valves. The carb. is getting a good flow of gas and should be working ok. I have also tryed 3 new sparkplugs.

Do you think it would be better to get a newer and working motor of Ebay?
 
  #5  
Old 01-23-08, 12:57 PM
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I wouldn't give up on this one yet, they are fairly simple engines.
Did you:
1) follow geo's advice on main jet cleaning? pull up his picture? This is oftentimes the problem with a Tecumseh....
2) Torque the head bolts properly ??
3) After installing new rings, did you make sure the cam gear was properly timed to crank prior to re-assembly?
The 692509 service manual at the following location covers your model.
http://toprake.com/index.php?module=...position=11:11
Good luck,
thanks,
 
  #6  
Old 01-23-08, 02:28 PM
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ill try everthing he said. the only problem is that i cant pull up his picture. it says: The page you are looking for cannot be found.
 
  #7  
Old 01-23-08, 02:50 PM
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Exclamation

Let me more descriptive on the problem here:
After a few pulls, my lawnmower trys to start up. even without priming it, the engine revvs up like it should. after 2 seconds of running, the engine backfires or stalls.

Because i am familiar with both 2 and 4 stroke engines, i think that the problem is not the carborator. it could be the ignition timing or the cylinder has sized or a loss of compression. Even a worn valve could of caused this.
I think it would take too much time and or money to try to replace every single part in it.

I Don't Know What To Do!
 
  #8  
Old 01-23-08, 03:22 PM
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spanky;
Here is a new link I just got see if it will show you the bowl nut(main jet). Have a good one. Geo
http://i190.photobucket.com/albums/z...c_bowl_nut.jpg
 
  #9  
Old 01-23-08, 03:52 PM
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Well, you can do what we've suggested thus far, especially making sure the bowl nut(jet) is pristine.
Let us know,
thanks,
 
  #10  
Old 01-23-08, 06:31 PM
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Yes i have seen this nut before. it holds the float bowl on and limits the amount of gas to the jet needle. I had done what you have toled me to do and stuck a small copper wire into it. but the engine still has this problem.
 
  #11  
Old 01-23-08, 07:16 PM
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just to let you know, my name is Chris. My birds name is Spanky.
 
  #12  
Old 01-23-08, 07:26 PM
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Chris, I know it's unrelated, but what kind of bird is Spanky. Have a good one. Geo
 
  #13  
Old 01-23-08, 08:36 PM
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Chris,
Your ideas in post #7 are good things to check,compression, valve issue, like tappet clearances, a failing coil is maybe a possibility.
The manual I suggested in post #5 will give procedures, specs, etc. on these items.

Give my regards to Spanky,
Good Luck,
thanks,
 
  #14  
Old 01-24-08, 03:05 PM
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Glen, Thanks for tha advice. I have the motor apart and I am still working on it.

Geo, my bird is a Cockatiel.


Thanks for the info.

I'm still working on the motor.
 
  #15  
Old 01-24-08, 03:17 PM
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Since you have the motor apart, I will assume the flywheel key is good. Gas cap venting ok?
 
  #16  
Old 01-24-08, 03:25 PM
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Hi, I've run the motor without the gas cap and the air filter before. same problem.


I have just finished measuring the valve sizes and replaced the piston ring. The camshaft and the piston rod are not damaged and the ignition timing is set correctly. The voltage is at the correct amount (22,000 volts).


nothing has changed the performance.
 
  #17  
Old 01-24-08, 06:13 PM
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Originally Posted by spanky068 View Post
Every time I try to start up my old Craftsman mower with a 3.5hp Briggs & Stratton motor on it, it boggs down immediately. i have cleaned out the carb., put a new air filter on it, add new oil, put new gas in it and tryed to wash all of the dirt off of it. the throttle govnor is not stuck and moving and the piston has been cleaned off. no matter what i do, the thing wont start up!!!

The engine model number is: 143.374032


Can someone please help me?
Thanks,
Chris
Have u checked the spark plug gap?
 
  #18  
Old 01-24-08, 06:24 PM
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i've tryed 3 new sparkplugs and mesured there gap.
 
  #19  
Old 01-24-08, 06:29 PM
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i know that it is the carb that is not working. the thing is about 23 years old.
I still don't want to give up yet because after 63 pulls, the mower finally runs perfectly.
 
  #20  
Old 01-24-08, 06:54 PM
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I just want to ask,
Is there any adjustments on the carborator? one of my friends said that the old carbs had the adjustments hidden and the only way of getting to them was to drill them out. is this true?
 
  #21  
Old 01-24-08, 10:17 PM
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No, there are no adjustments to drill out. If it doesn't have adjustments visible, then there aren't any. Soak the carb in a good bath type carb cleaner and you should solve the rpoblem.
 
  #22  
Old 01-25-08, 04:05 AM
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Originally Posted by spanky068 View Post
i know that it is the carb that is not working. the thing is about 23 years old.
I still don't want to give up yet because after 63 pulls, the mower finally runs perfectly.
.....mower finally runs perfectly ?? Great !
63 pulls is excessive, how many times you push primer bulb ??
Have you tried putting a teaspoon of gas in sparkkplug hole, or carb throat, or, shot starting fluid in carb throat ??
Enter 632387 (carb #) in model # box at:
http://www3.sears.com/
There's hardly any other carb simpler than this one, no adjusting needles, no choke,etc.
Ref #9 shows the simple primer bulb and it's retainer gizmo,(must be careful when using this highly technical term)
Might be all that's needed now is a new, firmly seated, primer bulb.
Let us know,
thanks,
 
  #23  
Old 01-26-08, 07:58 AM
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I've just put an order in for a new primer and a new throttle governor spring. I'll let you know when I receive these items.



-Chris-
 
  #24  
Old 01-28-08, 05:13 PM
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By the way, dose anyone know were I can find one of those carburetor baths? I think that would help.




Thanks,
Chris
 
  #25  
Old 01-28-08, 05:45 PM
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They come in 1 gal cans, Wal-Mart, or any auto parts place, common brands are Gunk, Berryman's, NAPA has a popular one.
thanks,
 
  #26  
Old 01-30-08, 04:19 PM
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I've just have a question,
How do you remove the primer on the carb.?
 
  #27  
Old 01-30-08, 07:04 PM
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If you look at the diagram I referenced in post #22, you will see the round spring clip gizmo that holds the primer bulb in it's well, pry it out with a thin bladed screwdriver,
the new primer bulb will come with a new spring clip retainer,
thanks,
 
  #28  
Old 02-04-08, 09:08 AM
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I have finally fixed the mower. It starts up instantly and runs smoothly.


Thanks soo much for your help!

-Chris-
 
  #29  
Old 02-04-08, 10:04 AM
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Great ! Good job !
 
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