Isn’t the std (standard) just mean the journals are standard, ie, not reground? That’s the understanding I have.
That is how things should be. The end bearing should be a snug fit, seated nicely over the dowel pin (not on it - easy enough to do ), and the half-shells should also sit down snugly in the case with the top edges flush with the top of the case rib. A light gentle prising with a screwdriver to get them out is good.
Ask him why the bearings in your engine (assuming he fitted them) are marked STD, even though it has supposedly been line bored by 0.5mm.
He told me earlier that the Std means that the bearing is for a standard crank, ie not re ground, or the inner measurement of the bearing would be smaller.
As soon as bearing are not standard for both case and crank, they have two markings, e.g. "std/0.5", but if the crank has not been ground and the case has not been bored, the bearings are marked just "std". Arnie has lost his marbles, I'd stop asking him things at this point, he can't remember what he did or didn't do. He's fitted std bearings and now telling you to fit bearings for a cut case. It can't be both. I'm sure he's a great guy and has built fantastic engines when he could remember what he was doing, This is sooooo much like a rerun of the mess someone I respected made of mine when he was suffering from undiagnosed dementia or Alzheimer's, I don't know which, probably both.
If it's an oversize bearing, ID or OD it will be marked on it in my experience eg 0.25 0.25 etc. Something like that. May be wrong, but I don't think I am. No it doesn't Have a read of this https://limebug.com/engine-bearings-thrust-oversize-explained/
STD bearings aren't suitable for a case that's been line bored. Looking at your (one) pic of the case webs: have they been machined at all? Seem to have a lot of wear/staining for a freshly-machined case...
Ok. Bearing in mind my callipers or me arnt very good at measuring, I think we can both agree that this measurement is closer to a cut case, than not, isn’t it?
It is, correct, although a bit undersized, but that may be your measurement. But...it may have been cut previously.
Indeed, so why the STD bearings. The more this thread grows the more confusing it becomes. Soggz, you need to get your measuring up a few notches, you're *******ing in the wind.
I have some recollection in the dim distant past of when this engine was first examined when it initially showed it's age of odd lateral play when you were checking end float. Was that you?.
