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A machine shop mixed my bearing caps a long time ago, and they don't have numbers stamped on them so they're all identical. How do I go about figuring out which ones go where?

 

think i'd just have it alighn honed and it wouldn't matter. if you don't want to spend the money to be 100% sure they're right you can check them with a straight edge, check for no lip where they mate to the block, and check for roundness with a bore gage or mics.

 

I went thru this about a year ago, and everyone I talked to said the same thing. If the cap is in the wrong spot, you'll notice an out of round condition of maybe a couple thousandths. Just keep switching them until you find the right one.

A machine shop should know better than that though. If it's not to much hassle, I'd take it back to them and make them fix the mistake.

 

Also, bearing caps leave a fingerprint on block where they've been clamped together. If you look at the mating surfaces in some good light, you can tell which caps came from where.

 

I would like to bring them back, but it was done a loooong time ago.
Thanks for the suggestions. I also heard that if you have caps in the wrong place then the crank won't spin freely when you try to turn it. I already have the crank and bearings lying around. Is there a method to check using parts, or would this ruin bearings/journals?
Ill try to check using the other methods.

 

I'd say that if you use all the suggestions mentioned, in addition to placing the crank in the block with the mains torqued down for testing, you will be okay.
I mixed up some caps once and i took it to a shop to have it all miked. Fortunately the guy is a friend, and he just looked at the bottoms of the caps and he could tell which ones fit where.
No charge.