My engine bangs and shakes violently

This goes on a good bit with this model replacing engine is actually quite normal or you're buying the pieces to make a new engine as it is If it's not shaking itself apart yet you can replace this reciprocating mass the short block whatever you want to call it the middle of the motor use your pieces that are all around it the girdle the oil pan etc If you must that might be something to look into because everything else is well not a complete functional ready to go solution.

 

That symptom is associated with a blown head gasket. If it has been that way for long, there may already be damage to one or more rods, and that means a replacement engine is the best fix.

A blown head gasket is best diagnosed by a borescope in the spark plug hole while pressurizing the cooling system with a test kit.