Hello! I have a 2006 Grasshopper 223 Zero-Turn mower and there is pressure coming from the oil filler tube that pushes the dipstick out. Any ideas what this is?|||There is a breather flexible rubber hose from the engine that allows the crank case pressure to vent to the intake just after the air filter.
When the engine is running, as the pistons move up and down it creates pressure pulses inside the crank case.
That pressure needs to be vented. If the breather filter is plugged, the pressure pulses will try to vent to the next weakest point.
Check the breather tube for kinks or pinched and filter for obstructions.
If that seems OK, you may have a broken piston compression ring, or a hole in one of your pistons.
Are you able to remove the spark plugs and do a compression test on the cylinders?
ADDED:
The other posibility, is a blown head gasket.
ADDED#2
Read this:
with 60 hours on it started blowing bluish smoke and ran thru a quart of oil in 10 mins. Called Warranty Repairs, as soon as the Tech came out he went right for the right side of the engine (right side looking from driver's seat)and pulled the plug out. Badly fouled. Head gasket blown. He replaced it and the 4 bolts. He told me this is a KNOWN issue with these particular engines. Told me Kohler used the wrong bolts and after heating and cooling the bolts on the right-hand side "stretch" and cause the gasket to fail. Also said Kohler had redesigned the head and eliminated 2 bolts, making the head almost impossible to torque down evenly onto the gasket.
I am livid. I know this engine had to reach unacceptable temperatures when it blew a quart of oil out, yet the Tech tried to reassure me by telling me there wouldn't be any other damage to the engine from the failed gasket and low/overheated oil.
Needless to say, I am now on the warpath and Kohler...
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