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Hpreacher
06-04-2009, 01:02 AM
I have a 25 HP twin cylinder Kohler Engine on a 60" X-Mart Rider Mower that is
burning a lot of oil. It has too much crankcase pressure and blows the oil out
of the vent hose that goes into the carburetor. I have pulled the heads and
checked the rings on the pistons and they seem good. I'm wondering if any-
one has had the oil-using problem on this Kohler engine and what you might
have done to correct it.

ALC-GregH
06-04-2009, 10:16 AM
I wouldn't rule out the rings. Chances are that's the cause of the problem. If it's building too much crank case pressure, then the rings are allowing blow by to happen. How many hrs and what oil have you been using.

MowerMedic77
06-04-2009, 10:46 AM
I would check the breather reed valve, it is probably broken.

Hpreacher
06-04-2009, 10:55 AM
I purchased new pistons and rings and am installing them. I will check the
reed valve. This valve was bent a little and I tried flattening it back out.
Is it possible that the reed is not seating properly and allowing it to leak?

Hpreacher
06-04-2009, 10:58 AM
You ask about the oil I am using; I am using 5/30 weight synthetic oil. We use it in all the
rider mowers, because the manufacture suggested it.

MowerMedic77
06-04-2009, 12:55 PM
This valve was bent a little and I tried flattening it back out.
Is it possible that the reed is not seating properly and allowing it to leak?

It should be flat and resting on the hole in the block, there should be a bent looking hold down bracket with one screw that secures it to the block.

Hpreacher
06-04-2009, 10:45 PM
Thanks for your quick replies, I haven't got the engine back together yet, but I'll let you
know what happens. This engine has hyd. valve lifters and the exhaust valve was burnt
so I relapped it. The valve didn't appear to be warped.

VegetiveSteam
06-08-2009, 04:24 PM
Look closely at the head gaskets if you still have them and didn't tear them up too badly when you took them off. Also does it show signs of oil usage on both cylinders? A quick look at the spark plugs should answer that question. If it looks like it was mostly on one cylinder I would probably blame the head gasket. You don't say if this is a vertical shaft or horizontal shaft engine. Kohler did see a few reed valves cracking or breaking on some vertical shaft engines.

Hpreacher
06-09-2009, 10:53 PM
Thanks for the information. I installed new pistons and rings, and also
new head gaskets. This is a horizontal shaft engine, two cylinder.
The left side showed it to burning oil, on the spark plug. The reed valve
was good. I have got it together and out working. I will see if what I did
corrected the oil-burning problem and let you know.