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rod bearing question

You will buy them to match the crank you buy......depending what the grind is on the crank.
 
So do I need to take the crank back out (pretty easy at this point), have it reground and then get bearings to match?
 
Was the crank ground fresh or are you using a used crank? I always have an old crank ground fresh and get bearings to match what the machine shop says it was ground to, 10 under, 20 under, or whatever. Using an old, used crank is asking for problems in my opinion.
 
The crank only had about 2,000 miles on it before I parked the car. I tore the motor apart to be sure. If I need to send it in, I will. I was hoping to just change the rod bearings and put it back together.
 
I see..... I would check all the journals real good. On the back side of the bearings you removed, it should have a size stamped. Buy that size again and install as you normally would. You could mic a couple of the journals to be sure. I would also look at each bearing that was removed and see if there was any scoring. If so, check out more.

I would most likely do as you say, buy new and press on with the build....this is my opinion so don't yell at me if something goes wrong..... :char
 
"rsalway" said:
The crank only had about 2,000 miles on it before I parked the car. I tore the motor apart to be sure. If I need to send it in, I will. I was hoping to just change the rod bearings and put it back together.
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If the old ones aren't marked, you need to measure the rod journals. Either by having it done professionally or doing it yourself with a micrometer. You could also measure with plastigauge, but would need new bearings first to do that. Personally, I'd run it by the machine shop. That could save you a headache later.

If they are marked, replace them. I would still check each journal with plastigauge though.
 
What is the reason for replacing the bearings to begin with, engine noise?

The bearings should not need to be replaced only after 2000 miles. Assuming you marked them when you took them out and there are no obvious abnormal wear signs, you should be able to just reinstall them.
 
"65fast" said:
What is the reason for replacing the bearings to begin with, engine noise?

The bearings should not need to be replaced only after 2000 miles. Assuming you marked them when you took them out and there are no obvious abnormal wear signs, you should be able to just reinstall them.
Click to expand...

I have the same question. I would leave as is if at all possible.
 
I got to the 4th piston when putting it back together and noticed a groove in the center of the bearing (nothing on the others). Checked the crank for any signs of wear and nothing. Maybe I should just take the crank back off and get it checked.
 
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