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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 13581
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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I have a koehler command pro 23 hp that is building pressure

Customer Question

i have a koehler command pro 23 hp that is building pressure and blowing out rear seal what could be causing this
Submitted: 2 years ago.
Category: Small Engine
Expert:  Curtis B. replied 2 years ago.
Welcome to JUST ANSWER small engines, let me try to help you !! Is the engine vent pipe open that goes to the air cleaner air intake? If vent is plugged, crankcase pressure is not relieved, and pressure will build! Or worn rings or damaged piston can cause excessive pressure in the crankcase. What is the model umber of the engine? CH, SC,CV, SV, ???
Customer: replied 2 years ago.
Ps-76550-bs is model number on ex mark zero turn I believe engine should be ch730-3225
Expert:  Curtis B. replied 2 years ago.
http://www.kohlerengines.com/onlinecatalog/pdf/sm_24_690_06.pdf
Expert:  Curtis B. replied 2 years ago.
Breather is up top, under the air cleaner cover.
Expert:  Curtis B. replied 2 years ago.
Is it open?
Customer: replied 2 years ago.
Yes it is open
Expert:  Curtis B. replied 2 years ago.
So engine is worn!