The Stovebolt Site Forums The Shop Area Engine Shop Rod bearing ID please?

Just pulled my 56 235 sump to clean it out.
Thought i would take the opportunity to check out the big ends.
A couple of them are grooved and the front 2 are showing the copper.
I prefer not to pull and regrind the crank although i know it is probably best.
So looking to just fit a new set of bearings and rebuild the oil pump if this would buy the motor another 10 or 20k miles?
Issue is I dont have a mic here the right size to measure the bearings.

There is a mix of bearings which is odd probably not a good sign either.

5 are marked
It looks like
AB 51 possibly UAB
6950 cap
7- 35. E
9 - 35 DA-49

The number 2 rod had a Clevite bearing 77
12 88. (I guess week 12 1988)
CB416P
AA

I cant see STD or 0.10. 0.20 or anything stamped on any of them to signify the size.

Does this mean i have std size journals?

Cheers guys
Richard

Ive seen those bearings marked UAB, numbers like yours, no indication of 10-under but guess what? They were 10-under!

On the other hand, Ive taken apart tons of Clevites, they always say .010 or .020 or .030 etc if they are undersize. Not a guarantee but thats my experience.

These days, to me, grinding a crank is like turning brake drums or boring the block - you cant get another one so think it over, if it looks good I wouldnt grind it!

For under $10 you can buy a digital caliper and get an idea what size your rod journals are.

The caliper is a good idea however micrometers are not really too expensive. Then you will know exactly the size of you journals. A good machine shop can then advise you what bearing inserts you need. Good luck and Long Live The Queen.

I have a decent digital vernier, must admit I never gave it a thought, always associate checking bearings with a micrometer . Will have a look this evening.
Rich