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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 12592
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: 1 year ago.
Category: Small Engine
Expert:  Curtis B. replied 1 year 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 1 year ago.
Ps-76550-bs is model number on ex mark zero turn I believe engine should be ch730-3225
Expert:  Curtis B. replied 1 year ago.
http://www.kohlerengines.com/onlinecatalog/pdf/sm_24_690_06.pdf
Expert:  Curtis B. replied 1 year ago.
Breather is up top, under the air cleaner cover.
Expert:  Curtis B. replied 1 year ago.
Is it open?
Customer: replied 1 year ago.
Yes it is open
Expert:  Curtis B. replied 1 year ago.
So engine is worn!