2002 Dodge Intrepid 4 cyl Four Wheel Drive Automatic
well the oil leaks from the realease valve and the car knocks not bad but knocks where you can be able to know that it is knocking. The oil light says on
the mechanic sayed that it has a lot of blowby? What? Is that?
Blow-by is caused when the piston rings are worn out allowing compression to leak past them into the engine's crankcase. As a result, if you open the oil cap, you will usually see and feel pressure coming out. When this happens, it usually causes oil to leak from many different places. If he is correct and there is that much blow-by and you hear a knock in the engine, it is due to be rebuilt.
If you have other questions, let me know.
April, 30, 2009 AT 5:59 PM
The knocking you are hearing is coming from worn bearings and perhaps a worn journal. The lower end of the connecting rod rides on a cushion of oil that surrounds the inside of the bearing, which surrounds the crankshaft journal. When oil is not maintained in an engine, the oil will lack its consistancy, thus causing that lower end of the connecting rod to come in contact with the bearing. The contact biulds up heat and wear out the bearing and in turn wear out perhaps a piece of the crankshaft journal. That small piece is the cause of the knocking.