Got the car running after replacement hg's and now there is a knock. First it was quiet, now it is loud and persistant. The car sat for a while with the hg blown, and I dont think he had the sence to change the oil. Anyhow, is it likely that it is a rod bearing that has gone bad, and can I fix it without removing the motor. Also, should I replace all the bearings? I am new at this, and have never done anything on the lower motor. I did not run it very long after it started knocking, so is it possible the crankshaft is ruined now? Any help would be great. Thanks Chris