here is a pic of my rod bearing. it's worn down to the copper. i pulled it because there was evidence of wear on my cylinder sleeve and wanted to see if i had bad rings or what.

question is, if this one looks this bad, does this mean i need to pull them all to look? why does this happen? is this the sign of a bigger problem.

this cylinder has been missing and i've got a tick coming from low in the engine.

 

Oh yeah you seemed to found the noise on yours lol.Not sure why that happends but im told that engine blocks twist a little over time and causes uneven bearing wear.Right now my short block is at a machine shop geting all new main
bearings and rod bearings,Crank is also geting line bored.

 

The last rod to receive oil in the oiling system will look the worst. Check rods 7 and 8.

 

looks like i should just go ahead and rebuild this thing? no getting around it. any last thoughts before i dive in.

 

Pull the all and replace them. How often do you change your oil, what have you been using?

 

we talked yesterday. i've got a missing cylinder 4, a tick and exhaust in my coolant. now i've found my rod bearing are wearing down. this truck has always been serviced at a lr dealership. oil changed every 3000 miles or so. a month ago i put some rotella 15w-40 in it.

 

You cant just put new rod bearings in the crank will need some machine work.
Also im not sure which truck this is for but some of the 4.0L have 4.6 main bearings so that will need to be determined before you buy anything.

By no means am i a expert at engine rebuilds im just sharing what i gathered so far.

 

4.0 and 4.6 have different main journal sizes?

 

looks like 4.0 and 4.6 are the same. but i needed machine work on my crankshaft so standard rod and main bearings didn't fit.

 

I don't see why you could not do an in-frame replacement of the rod bearings like in big trucks and tractors. The question is what size bearings to install, standard size or .10 over ?