To narrow the bearings, I use a modified connecting rod where the back side of an old rod has a round extension welded to it so the rod can be placed in a lathe.  The small end of the rod is simply cut off to get it out of the way.  The rod cap itself can be removed while on the fixture and in the lathe.  With the bearing installed in the fixture, I’m able to machine the edge of the bearing to the desired width.  While in the rod fixture, I put a slight chamfer on the journal edge of the bearing.  Keep in mind that once the bearings are narrowed, it’s important to keep the upper and lower halves marked accordingly.

Lorena, Texas (South of Waco)

Nice that the machine shop left a good radius on the journals.. but, if they over did it, return the crank and have them reduce the radius some.

Paul

The person who ground the shaft needed to know that you were nitriding it so they could allow a bit more clearance all round.

You might find your bearings will need clearancing now as well

If it was the same company that ground and nitrided the crank then they should have known better.



In any case, looks like you will have to scrape them

Gary - 1958 Star Customline and 1940 Ford Deluxe Hotrod

I already have them. They touch.

Use a 745HN clevite bearing. It`s allready narrow and fits right in.

Greg Dietrich Mt.Morris Il

Got crank back from grinder, 3.62 stroke 2.00 journal, nitrated, nice fillet BUT... Bearing edge touches the fillet. Need to trim about .020- .030. Anyone have a good way to do it?