What has happened to my Kohler ?

UPDATE.

I think I know what has actually happened to my Kohler engine. I mentioned previously that the oil filter appeared to have loosened and was allowing oil to leak out of it. Because the engine air intake is quite close to the oil filter I think that the engine actually sucked in some of the oil from the leaking filter, hence the oil in both the air pre-filter and the main filter and onward into the carburettor and then eventually, after a combustion stroke, into the exhaust system.

A friend of mine has suggested that I squirt some carburettor cleaner, which I have, into the carb, but that I take the carb off and squirt it into the engine side of the carb. and use the airline to blow it right through the carb rather than just squirting it into where the air cleaner filter fits on to it. I have never used carb. cleaner like this before, I have always just squirted it into carb. inlets on things like chainsaws etc. Could anyone advise me please if it would be more likely to be successful if I did take the carb. off the engine and squirt the cleaner from the engine side and then blow air in the same direction ?

I have ordered new air & oil filters, plugs, etc. which I shall fit when I have used the cleaner. Thanks in advance for any opinions/advice that anyone can give.
 
Don't pull the carburetor just to see if it will try to run on carb spray. Just spray it directly into the carburetor opening lightly while the choke is open. See if will try to fire up and run for a few seconds. Having an air cleaner in place is not important to see if it will try to fire up.

Let us know your progress.
 
Auto Doc's said:
Don't pull the carburetor just to see if it will try to run on carb spray. Just spray it directly into the carburetor opening lightly while the choke is open. See if will try to fire up and run for a few seconds. Having an air cleaner in place is not important to see if it will try to fire up.

Let us know your progress.
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Thank you very much for that extremely helpful post. I will wait until I've got all the bits that I've ordered and in place. I want to connect the plugs to the HT leads first and see if they spark O.K. before I screw them in.
 
Scraperman said:
I have a ride-on Scag that is quite old and I think I may have a very serious problem with the engine, a 20hp Kohler (details below).
View attachment 74949
Basically, although the engine will fire and run for a few seconds it then slows right down and stops. I then discover that there is engine oil in the carburettor and air cleaner, also dripping out of the exhaust, and when I first noticed all of this it had also leaked out of the engine oil filter which was slightly loose, I wonder if this may have been because the rubber sealing ring of the filter may have been fractured because of back pressure.

My first reaction was that some or all inlet and exhaust valves must be permanently closed or open for some reason. Or has one or more of the piston rings broken and thus allowing oil to get on top of one of the pistons which in turn is throwing it out through the inlet and exhaust valves ? The only other thing that I can think of is that the engine breather is totally blocked.

I would appreciate it very much if anyone on this Forum could suggest what the problem could actually be or shed more light on the problem in any way. I have very limited knowledge of this type of engine. Thank you for reading this.
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Rings and worn out cylinder wall.
 
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