125 Breather
 

Good Afternoon All. I swapped out my mower deck from the 124 to
the 125 yesterday because the 125 is running better then the 124.

After I ran it for a while I was smelling quite a bit of exhaust or
burning oil or something hot. Quite a bit of exhaust, white, was coming
from breather. I pulled the breather today and did not see anything
to unusual except it was quite saturated with oil. Drain hole at the bottom
( at least I think that's what it is) was clear.

Is it possible that something has failed in the breather, like the reed, that
would not be obvious.? Would it create this symptom.

Would something more internal cause this and the breather would be fine?

Lastly in just trying to learn this engine. What are parts 29 and 30 for?
They are called fuel pump pad and gasket. Fuel Pump?
Attachment 108927

Thanks for the help

Ken

Parts 29 and 30 is below the breather. The cover and gasket is diamond shape and it covers the hole for a fuel pump which not used on this engine for the 125.

As for the breather, most of what I know for it smoking is blow-by and sometimes running too hot. I've also heard a bad head gasket can create this issue. Other people will chime in, I'm sure.

From my experience, blowby in the color of white smoke is usually caused by having piston slop in the bore, allowing for some products of combustion to work their way down past the rings, into the crankcase, and out the breather. My 107 had this issue with its 10 horse engine, and in fact still has this same issue with the 12 horse I swapped in, although it's much less on the 12 horse.

A real defining factor of blowby being caused by piston slop is that it will occur even when the engine is cold, sometimes stopping once the engine is warmed up. Because the engine is cold it is very unlikely to be smoke from overheating.

I would suppose, though, that a blown head gasket may also cause similar blowby. Pulling the cylinder head and checking everything out under there might not be a bad idea. If the gasket is blown, perhaps the blowby is a combination of both overheating from the lean mixture caused by the blown gasket, and smoke from combustion?

Thanks for the feedback fellas. I was scratching my head trying to
figure how exhaust would end up in the crankcase. I will take a look
under the head and come up with a plan. I am planning on tearing
down this tractor this winter anyway.
Want to keep it going through the fall because I enjoy hauling the
wood trailer with it. Will put it on the winter shop work list.
Took about 1 second to see what you meant Billy O. once you told
me about the unused fuel pump hole. Kinda wondered what that was.

Ken