i bought this rebuilt block from import builders but i was running lean and the pistons rings got screwed up so i pulled them out to rehone and install new rings. when i pulled the crank, i noticed some of the crank journals was worn slightly.i can feel it slightly with my finger. if i have the crank polished and smoothed out can i reuse the bearings with 500mi on them. will the polishing of the crank screw up my clearances enough to make me have to buy different bearings?here's some pics. i'd appreciate your feedback guys.

 

how many miles are on it

 

i don't know originally but it was balanced and polished when it was rebuilt by import builders 500 mi ago.

 

im not an expert on this but it looks like the crank is ok

could the bearings be breaking in still ??

 

the bearings dont look that good...shine spots=no good
replace them, as far as the pic, the crank looks good, but then again is a picture.
if its not bad, you can get it micropolished and it shouldnt make a difference in tolerances

 

thats normal you can reuse those bearings

 

120 k and my bearings didnt even look that bad

 

couple things:

Just my opinion... I'd have that crank checked out. those bearings look like an out of round situation IMO. Notice how they're right on the top/bottom of the bearings.. almost like when it was under side loading there was play. My old F22 shortblock with 300k looked better than that. Could also be a bit of oil starvation in with this mix too. I looked in some of my old crusty machineshop manuals I've collect and matched up almost identically (visually) with the following symptoms:

MISALIGNMENT OF SHAFT AND HOUSING

There are a number of causes that give rise to misalignment of the crankshaft and
cylinder-block housings, such as improper machining, bent crankshaft, distorted
cylinder block, etc. These defects result in localized wear, which tends to be
greatest on some of the main bearings and less pronounced on others.

Recommendation: ensure that cylinder-block and crankshaft machining
tolerances are in accordance with the engine manufacturer’s specifications

 

In my opinion I would change the bearings to new ones since the crank is already out. I would also take the crank to a machine shop and have them inspect the crank. Micropolish should do the trick if it needs any work on it!

 

if the bearings are worn on the bottom, chances are this motor seen some very high rpm during break in, as for the bearing being out of round, only way is to check on a plastiguage strip, the specs don't seem acurate for the type of wear... but i've seen much worse.

get some plastigauge and have fun checking.

 

Get crank checked too see if the damage can be polished out or if it has to be cut. Also get the line bore checked. If it has to be cut make sure to ask to have radius put back the journals. If you just polish the crank you can buy the same color bearings to start, some of the clerances will prob be out of spec. DO NOT reuse the bearings you have! You can check the clearance with plastigauge, get the green one. While you're there look at your rod bearings as well. For future reference engines take more oil after a fresh build. For instance a Prelude H23 takes 5.7Q after when normally it takes 4.6Q

 

Like people said above, take your crank to the machine shop. If it is bad, it can be reground. In that case I would go with ACL oversize bearings.

In any case, I would definately replace the bearings. Why not, you already have everything dissassembled, and you can but a complete ACL bearing set for about $120.

 

What you see on those bearings is a normal 3/4 wear pattern. Clean everything and put it back together. If you want to mic everything then I would install the main bearings in the block and torque to spec, then check housing diameter and subtract crank diameter from the first #. Do the same thing with the rods. Housing bore minus crank diameter to get your clearances. Bearings look good though, still breaking in.

 

If you have marks on the crank disregard any other advice and have it checked by the machine shop.

 

people are telling him to use the same bearings...???
One of them even has dirt inprinted on there....

 

Looks and sounds like you had a detonation problem as well thats what did that to your bearings.How hard where you running it with less than 500mi??Why was it so lean in the first place are you running un-tuned?What did the plugs and or piston tops look like any pics?As far as the crank goes that depends on the damages depth on the worst jornal,polishing might save,but I would change bearings anyway if it was detonation the bearings might be deformed from the beating they took.