Visit our tractor and agricultural equipment communities:

Ingersoll Forum Case IH Forum Combine Forum Hay Forum

JCB Forum John Deere Forum Kubota Forum Mahindra Forum

Massey Ferguson Talk New Holland Forum Valtra Forum Yanmar Forum

Zetor Forum Farming Forum

Reply to thread

Help Support SkidSteer Forum:

Message: <blockquote data-quote="skidsteer.ca" data-source="post: 2661" data-attributes="member: 307"><p>An engine is a "air pump" It draws air in, the cylinders compress it, then after the power stroke it is expelled out the exhaust. Blow by or pressure in the crankcase, (air coming out dipstick hole, or oil fill hole, or usually crank case vent tube) is air that has leaked passed the piston in the cylinder (s) and is a sign of piston ring wear or a poor seal between the piston and cylinder(s)------------------------------------------------------------------------------------------------------------------------------------------------- Some blowby is normal even for a "just broken in" engine, (new engines may have more until the piston rings seat themselves) As an engine wears, hopefully over several thousand hours, blowby gets worse, until eventualy compression is to low to fire the cylinder.-(note cylinder may missfire for numerous other reasons) and the engine miss fires. ----------------------------------------------------------------------------------------------------------------------------If one cylinder is worn this bad, you will see and feel a vary noticable PUFF PUFF of air coming out the breather tube. If all cylinders are wore badly, the volume of air coming out the breather tube can be @ 20 % of the volume of exhaust gases. (in my experince) Usually by the time its this bad, the blowby will be carrying crankcase oil out with it and the engine will look "messy" as oil may be leaking out crankshaft seals, or oilpan and valve cover gaskets. (from the bressure trying to escape) The only repair for blowby is to rebuild the engine. (Bore it out, new pistons and rings) Hopefully, you get many thousand hours from your engine, and "the fog" coming from your crankcase is minimal. Ken</p></blockquote><p></p>

Verification