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Curtis B.
Curtis B., Technician
Category: Agriculture and Farm Equipment
Satisfied Customers: 3016
Experience:  Technican turned service manager on multiple lines of equipment and rental equipment.
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420 case skidsteer shibaura 2.2 diesel 2005 year only 135

Customer Question

420 case skidsteer shibaura 2.2 diesel 2005 year only 135 hours runs fine but smokes excessively from valve cover breather hose white smoke smells like oil also builds pressure if you put thumb over end of hose
Submitted: 2 months ago.
Category: Agriculture and Farm Equipment
Expert:  Curtis B. replied 2 months ago.

High crankcase pressure can be caused by oil level being high or the oil thinned by having diesel in the oil. But usually high crankcase pressure is caused by piston and rings being worn or damaged or worn valve stems, both can let the combustion in the cylinder leak into the crankcase, causing the high crankcase pressure. Has engine ever been overheated or run low on oil? Which will damage the rings and pistons.