1. Excessive Crankcase Pressure: When the pressure inside the crankcase becomes too high, it can force oil up through the dipstick tube. This can be caused by a variety of issues, including:
* Worn or damaged piston rings: Worn or damaged piston rings can allow combustion gases to leak into the crankcase, increasing the pressure.
* Clogged PCV valve: The PCV valve helps control crankcase pressure by allowing excess pressure to escape. If the PCV valve is clogged, it can cause pressure to build up in the crankcase.
* Improperly installed oil filter: An improperly installed oil filter can block the oil return passage, causing pressure to build up in the crankcase.
2. High Oil Level: If the oil level in the engine is too high, it can cause oil to be pushed up through the dipstick tube when the engine is running.
3. Defective Oil Pressure Relief Valve: The oil pressure relief valve is designed to regulate oil pressure in the engine. If the relief valve is defective or stuck closed, it can cause oil pressure to become too high, leading to oil spitting out of the dipstick tube.
4. Excessive Blow-by: Blow-by refers to the leakage of combustion gases past the piston rings into the crankcase. Excessive blow-by can increase the pressure inside the crankcase and cause oil to spit up out of the dipstick tube.
If you notice oil spitting out of the dipstick tube on your GM 350 V8 engine, it's important to have the problem diagnosed and repaired as soon as possible to prevent engine damage.
