Oil or carb problem

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  #1  
Old 11-30-15, 01:02 PM
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Oil or carb problem

Hi All, 13 HP Techumseh engine in a Wheel Horse tractor,won't run how can I tell if it is carb problem or oil consumption,smokes really bad runs extremely rough,then dies.
Geo
 
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Old 11-30-15, 01:31 PM
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Blue smoke would point toward oil consumption and black toward fuel problem. I've seen some mowers, etc. running pretty darned good while leaving a pretty heavy cloud of blue smoke, not saying that makes it a good thing, but would cause me to suspect that you have a fuel problem. And if it's an excess fuel problem, which can wash down the cylinder walls with gas, oil consumption could be a symptom rather than a cause.
 
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Old 11-30-15, 02:13 PM
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I would tend to agree with pedro, what color smoke?
Might also be a head gasket....what tecumseh engine?
 
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Old 11-30-15, 02:54 PM
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One simple check is to remove the bowl on the carb. and lift up on the float to see if the fuel shuts completely off.
 
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Old 11-30-15, 03:32 PM
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Hello Mr Geo,

First thing to check is the engine oil level to see if it's over full and smells like fuel, if the carb float needle valve sticks open fuel can enter the crankcase through the rings. That will cause excessive smoking and bad run issues, If you find this, a carb rebuild and oil change will be in order.

Replace the fuel filter and spark plug as well and you may need to blow the excess fuel and oil mix from the cylinder, when this is done and the engine is cranked up, it will continue to smoke until the excess oil/fuel mix is burned out of the muffler.

Good Luck
 
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Old 11-30-15, 05:50 PM
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I had that problem before and I install a manual gas shut off which I close after each use,filter and plug are both new,I guess I will pull the carb and see what it looks like.
Smoke color is kind of light blue.
Geo
 
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Old 12-01-15, 06:04 AM
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If you get into carb problems you can get a Chinese carb for that engine pretty reasonable. I just put one on an H70 and they work work fine. Ran about twenty bucks with no freight.

If you're wanting to keep it OE, though, a replacement would be out of sight.
 
  #8  
Old 12-01-15, 01:21 PM
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Definetly a carb issue ,crankcase was full of gas,the weird part of it is the gas was shut off at the valve until I started it,gas tank full of gas ,it started and ran like Crap for about 15 min.in that amount of time the quite a bit of gas went into the crankcase.
I think I will rebuild the carb,it's a Walboro LMT,ever done one before?
Geo
 
  #9  
Old 12-01-15, 02:31 PM
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I would look at a fix on the float valve which wouldn't take too much and if that fixes it you have a cheap deal. A float/valve/seat would likely cover it and it's not too involved doing it.
 
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Old 12-01-15, 05:00 PM
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That's what I thought, I was thinking of pulling the needle valve out and spraying carb cleaner in there and anywhere else there is an office, although it was running fine previously, it must be a float/needle valve problem for all that gas to be sucked through.
Geo
 
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Old 12-02-15, 06:30 AM
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Old 12-02-15, 11:07 AM
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Thanks, I had that one also some good stuff on Utube.
 
  #13  
Old 12-02-15, 11:46 AM
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I once had a Tecumseh 10 HP engine where over half of the tank of Gasoline drained down into the crankcase through the fuel bowl, and then the Oil from the crankcase, being lighter, made its way up and over into the fuel tank . . . . where my Wife noticed the murky rainbow on the surface as she checked it before use.

Several mechanics have told me that this situation is fairly common with gravity feed Tecumsehs . . . . and not unheard of with other brands.

It's usually just a sticky needle (stuck open).
 
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Old 12-02-15, 03:05 PM
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Tecumseh's retained a brass float for some time and the would leak, hard to find, unless you remove the float (if brass) and shake it next to your ear, if you hear sloshing replace the float. They also used a rubber seat and solid needle valve which, if the seat is worn or installed incorrectly will leak by.
 
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