What causes blow-by on 6.4 Powerstroke?
What causes blow-by on 6.4 Powerstroke? Worn rings can cause excessive blow by. Cracked block can be perceived as excessive blow by because of how the smoke looks when oil mixes with antifreeze. Usually only happens on trucks that are studded though. Tell tale signs are slimy sludge under the valve covers and oil fill cap as well as disappearing coolant. What causes blow-by in a new engine? During combustion, high pressure on the top side of the piston pushes combustion gasses, as well as droplets of oil and fuel, past the piston rings and into the crankcase. This mixture...