Question on crank wear

So after removing the crank from the block this weekend I noticed that on the bearing racers the what looks like maybe inspection ports, Some of the them are no longer round and it looks like that maybe some were chipped and are now oblong.

I am replacing the bearing on this and am wondering if it will cause a problem.

Also i found online a 4.0 crank for a late 90's jeep for $150 claimed to be new, is this able to be made to work?

 

Pic? Which bearing, crank or rod, and in which position? What's the history of this? Did you pull it apart because it's banging?

No, the 4.0L crank won't work. It has a different stroke from the 258.

 

I forgot to take pics of it, and I wont be able to get back to it till this weekend.

I pulled it apart because I cant drive it here in California due to inspection issues and since I can't drive I figured I would replace what I can and see if i can get it put back together.

The area I am looking at is where the bearings go when it is mounted to the block if I remember right. Sorry I can't be more specific. I will see if I can get back over there before this week end and take some pictures.

 

I'm guessing you are refering to the main bearing and rod bearing housing. If the bore is out of round yes it will be a problem. In both cases a machine shop can resize them. In the case of the rods it is refered to re conditioning the rods. They grind off a small portion of the rod and rod cap and then grind them round to the correct diameter. The process is similar with the block but it is refered to as line boring the block. If you are looking at the actual bearings and see some wear that is normal for a high mileage engine. In that case have a machinist check the tolerances of the rod and main journals on the crank shaft. The crank shaft may not need to be machined but if it is worn it can be machined and oversize bearings are used.