I used to have the same thing in an older truck and it lasted until I sold it and havent ever heard from the guy that bought it. From what I have been told they can run a long time like that (as long as you dont hammer it). If there is a rebuild in your future you might just wait until you can do the whole thing. 03hdfatboy is right I worked for a shade tree mech. that did mains and rod bearings in the car/truck all the time. Oh yah I have heard that noise could be a wrist pin also
