Crankshaft is now .060 / .030, whatever that means.

diyguy

Member
Going through paperwork from 1999 on an engine rebuild. The machine shop noted "crankshaft is now .060 / .030. Either the rod journals are .060 undersized and the mains .030, or vice versa. How can 'ya tell which is which without micing the crank? Is there a standard for this?
 
(quoted from post at 18:41:51 06/04/16) Going through paperwork from 1999 on an engine rebuild. The machine shop noted "crankshaft is now .060 / .030. Either the rod journals are .060 undersized and the mains .030, or vice versa. How can 'ya tell which is which without micing the crank? Is there a standard for this?

Most machine shops stamp the crank with 030 R , 030 M , etc .

Most oversize bearings have .010 etc etched in the back side , some standard have std or left blank .

At a bare minimum a guy needs a $10 set of calipers .

http://www.ebay.com/itm/6-Inch-150m...695462?hash=item3abf2ff966:g:sPQAAOSwZQxW4ZY3
 
Diyguy,.060 means it has all ready been turned under sized to the limit and can not be turned any more.If the journals that are .060 are worn any it is time for a different crankshaft.
 
Thanks, guys. I know .060 is the max on a journal. Was just wondering whether it's customary to call out mains or rods first in a description, kind of like the way GPS coordinates always specify latitude first then longitude.

That's a decent price for a vernier (8.97 & free shipping) if it half-way works. ;) Amazon has what looks like the same one for $6.33 & free shipping on eligible orders. I have a good ol' NSK dial caliper with a .001 cert so I'm OK there. :)
 
(quoted from post at 19:40:17 06/04/16) Thanks, guys. I know .060 is the max on a journal. Was just wondering whether it's customary to call out mains or rods first in a description, kind of like the way GPS coordinates always specify latitude first then longitude.

That's a decent price for a vernier (8.97 & free shipping) if it half-way works. ;) Amazon has what looks like the same one for $6.33 & free shipping on eligible orders. I have a good ol' NSK dial caliper with a .001 cert so I'm OK there. :)

Most all good machine shops refer to the mains first then to the rods secondly. This would mean that the crankshaft in question would have .060 main journals and .030 rod journals. The crank IMO is on its last leg, as the hard surface area is about gone or very close to it. If the motor were a higher compression motor, I would be getting another crank and not take a chance on the .060 mains. It would cost less than another rework and parts IF the crank did not hold up. :cry:
 

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