I checked my ring gaps today and got my pistons installed into the block. I started checking rod bearing clearances but seemed to be a bit over on standard sized bearings according to the plastiguage. I guess I’ll revisit this after some more research. The odd thing is that the .10 undersized bearing seemed to have more clearance than the standard. Maybe I’m missing something or doing it wrong but I’ll get it figured out in the next week or so
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Nice. Nothing like a fresh motor!
What’s the clearances looking like?
Tight with standard rod bearings. I only got the first journal checked. Judging by the green plastiguage it’s just over .025 mm. This is my first time rebuilding an engine so I do a lot of things two or three times before I figure it out. I bought standard and .010 undersized rod bearings because the ones that came out weren’t marked at least that I could find and were all worn so I couldn’t really measure them accurately. I’ll check again this weekend. Maybe I didn’t torque it down evenly enough or when I pushed the cap on the rod bolts I squeezed it too much.
That’s pretty tight. I recall a normal bearing clearance being .002-.003” which is .05-.08mm. You can measure crank journals and rod ends to determine what size you need.
There’s probably an assortment of bearing sizes that would accomplish the clearance you need.
Undersized is for when the crank has been ground correct?
I’ve looked around and all I’ve found is standard, and undersized from .010 - .030. Undersized is for when the crank has been ground correct? Maybe I just need to try it again and see if I get the same results and then go from there. I still have 3 journals that I haven’t checked yet so maybe I’ll learn something in the process lol I don’t have a mike just a decent set of digital calipers so I don’t know how accurate of a measurement I could get on the journals with that.