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Cub Cadet 147 125 Oil Leaks

M

Mike OH

Well-known Member
Have both a Cub Cadet 147 and a 125. The 125 had a slight oil leak coming from under the front of the engine when I got it and now the 147 has developed a similar leak. Leaking only seems to occur when running. Can't really see where it is coming from, but neither appears to be coming from around PTO area or opposite end of motors. Suspect oil pan gaskets may be leaking. Is this a common area for leakage? Would like to order new gaskets before pulling engines so they will be on hand if that is a likely place for leakage. Any recommended sources for gaskets?
 
It's NOT uncommon for the pan gaskets to squeeze out a bit and leak. Could also be oil leaking from the tappet cover and running down the front of the engine.
 
In my humble opinion do this at your own risk. You need to clean up everything real real good. Gasoline or brake pad cleaner, etc. Try dusting with a tiny puff of flour. You will find the leak most likely. Trick is everything needs to be spotless clean and dry.
 
Wow, I've put THOUSANDS of hours on Cub Cadets with those size Kohler engines in them, never had a oil pan gasket leak. Had them leak about everywhere else. In the Kohler K-series engine manual there's instructions on how to make a U-tube manometer and test crankcase ventilation. There's a reed valve in the valve spring chamber right beneath the carb. That reed valve controls how my pressure the engine builds in the crankcase that can force oil out past seals and gaskets. The net effect of the reed valve is that the engine creates vacuum in the ceankcase, but there are pressure spikes because of the piston going up&down 60 times every second.
Anyhow, find the Kohler manual, it's a free download off Kohler's website, small piece of wood, several feet of small diameter clear vinyl tubing, and a cork or rubber stopper, follow the instructions. Test will tell you if piston ring seal has gotten bad enough to require a rebuild. Best test available for a Kohler, compression test not possible because of compression release built into exhaust camshaft lobe.
 
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