Blowby is a condition to where you have excessive pressure in the crankcase of an engine usually from worn piston rings. A faulty PCV system can also cause excessive engine blowby.
Excessive crankcase pressure will cause this problem two possible causes are worn/broken piston rings or a blocked engine breather.
your pcv valve or hose is restricted causing excessive crankcase pressure
Lots of things-bad oil pressure, restriction in the oil drain tube on the turbo, excessive crankcase pressure, and a worn turbo can cause turbo smoke.help@coloradoturbo.com
1. The crankcase breather may be plugged. or---- 2. Too much crankcase pressure. There is too much blowby (combustion gasses leaking by the rings or piston), causing excessive pressure in the crankcase. To repair this, you will need to re-ring or bore out the engine with new pistons and rings.
excessive crankcase pressure can cause caustic gasses to be pushed up the distributer shaft. check to make sure the engine has the pcv system clear of carbon, so it can breathe the gasses back thru the intake system. Another thing that is a good indication of to much crankcase pressure are oil leaks.
Excessive blow by from an engine position sensor. You would check this by verifying crankcase pressure and making sure the engine is in proper time and valves properly adjusted.
Because there is a vacuum in the crankcase. There should be a slight vacuum due to the positive crankcase ventilation. If there is excessive pressure or vacuum, you have ring blow-by, meaning your rings are shot.
Normally caused by excessive crankcase pressure. A blocked breather or bad piston rings are the likely causes.
PCV stands for positive crankcase ventilation. You crankcase needs to be ventilated to keep pressure down. Too much pressure will cause excessive oil consumption by forcing oil past the rings into the firing chamber thus burning oil. In the old days the crankcase was vented to the atmosphere causing polution. On todays engines it is a simple ball valve that opens when the engine is running. The pcv ball is sucked open to allow the excessive pressure to be returned to the intake manifold and it becomes part of the fuel air mixture. If the valve is stuck the crankcase pressure builds up and forces oil past the rings as if no vent were there. Checking the pcv is easy. Just pull it out and shake it. You should hear the ball moving back and forth in there. If you don't you will need to replace it.
Excessive head pressure.
In crankcase filter box