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Techumseh OH160 carb troubles? Or intake valve?

J

John Sellers

New User
I recently rebuilt an OH160 Techumseh for a Wheel Horse. I cleaned and rebuilt the carburetor, which is a Walbro. I double-checked to make sure that the float level was correct. However, when the engine is running, the carburetor will blow raw fuel back out of the carburetor. I had a theory that the intake valve was not seated properly and that compression was blowing fuel back out of the carburetor. I removed the intake pipe from the head and sprayed PB blaster in on the valve to check for leakage down into the cylinder on top of the piston (I used PB because of the liquid color would be easier to identify on top of the piston. However, I noticed no leakage by the intake valve at all. Keep in mind that the engine is in time. Is this an actual problem with the carburetor, or could the valve not be seating properly during operation causing leakage of compression by the valve?
 
i havent seen many small engines that dont spew a little with breather off.
how does it run,and does it flood when you shut it down for a few minutes?
 
I soaked the carb in cleaning solvent for a week, then rinsed with warm water. I used air to blow dry the carb, used several sizes of small wires to clean the orifices, and rinsed with carb cleaner, and used a blow nozzle to dry the orifices and remove any foreign material.
 
I adjusted the carb after the engine warmed up. It had a tendency to surge periodically, and then straighten back out. This occurred every minute or so. I noticed during this surging period is when the majority of the raw fuel was pushing back out of the carb. It never flooded after shutting it off. This particular fuel system has a small diaphragm pump to supply the carb that runs off of crankcase pressure.
 
did it keep surging after engine warmed up? if its a later model engine with the emission crap they tend to starve for fuel during warm up...that will cause the governor to kick it up.
if it continues to surge after warming up make sure you clean every passage inside carb.
sometimes if you get lucky you can stick your palm over carb throat and create enuff vaccum to pull a small piece of trash on thru...its worth a shot before pulling carb back off.
 
On a small engine 99% of surging is caused by NO or lean idle mixture. Does the idle mixture screw have any affect? If not, you have a plugged idle mixture passage. Tecs are good about this.

Kent
 
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