Help! Engine Vibration
where do you get this info? every engine i have ever dealt with(all brands included) follow the same general rule. forged steel cranks are internally balanced and cast are externally.
are you saying that the factory internally balanced all 318's even if they were cast cranks?
please supply us with some in depth knowledge as to why you think this.
Maybe you should go to school about engines. Just because it is a cast crank does not automaticaly make it an external balanced motor. The 440 6 pak motor had a forged crank and had a small counterweight on the balancer....yet is was internally balanced.
The 318's came with cast and forged cranks and up thru 1991, use the same balancer. I just checked the Mopar parts book and they list one part number as a replacement. (yes there were a few variations with the timing mark in a different location, but the same neutral balance)
Now, the outer ring on the damper is neutral and even if it has slipped or is wobbling won't cause the vibration. You could take that off and throw it away and it won't vibrate... done that on many a dragster way back when to keep it from slinging off going down the track (before they made good balancers). Crankshaft pulley wobble? Show me one that doesn't from the factory.
If this thing is vibrating from an idle all the way up, it is more than likely the engine is grounding against something.... like a bad trans mount. They are notorious on Chryslers for slipping out of place, coming apart.... you guys have replaced your share so you know that is fact. If the rods that went in were factory 318 rods and the pistons that went in were cast, there wouldn't be that much of a difference in the weights to cause the thing to vibrate all the time, only at certain RPM's and it would be slight at that. I replaced 2 rods and pistons in my race motor and it has solid motor mounts.... it doesn't vibrate.
So let's look at this a little closer.... Look at the trans mount and exhaust system before ripping the motor out for no good reason. If the mount is bad, replace it. If the exhaust is touching anything.... fix it. Eliminate the simple things first.
