Crank polishing
 

Got a crank that needs polishing to get another .001-.0015 on the rod throws. Anyone have a method for doing this in house, or is a machine shop the ONLY way to get this done... trying to meet a deadline.

Re: Crank polishing
 

You should never try to polish crank to remove material for clearance as you will not have flat journal in the end.

Re: Crank polishing
 

Can't find +.001" bearings?

Re: Crank polishing
 

Marvin,
You could just "polish" the bearings instead. After all, aren't they made of a softer metal than the crank? I'm JUST KIDDING. Just call the crazy Ukarainian and I'm sure he will get the right parts for you before you even get back out to the garage.

Re: Crank polishing
 

Bearings are already .001 oversize and coated so I can't polish them, no .002 available. Looks like a trip to the machine shop, I don't have access to a lathe.

Re: Crank polishing
 

You can't polish what you need in the crankshaft. Get the bearings you need undersize and have your crankshaft grinder set the clearance with the crank grind. If you try to polish the journal will be swaybacked.

Re: Crank polishing
 

Open up the rod bores to max spec, if that don't put clearance to where it needs to be, grind the crank -.010".

Re: Crank polishing
 

Won't resizing the rod end change the crush on the bearing?

Re: Crank polishing
 

The range is usually only .0005", if your rod bores are slightly undersized, going to max bore spec may get your clearance closer to where you want it to be. Removing the flashing from the back of the bearing shell with Scotchbrite can help gain a tenth or two of clearance as well.

Re: Crank polishing
 

Rods could be @ low side (small side) of spec,if they are new rods maybe under spec,new rods need to checked also,most are left under specs about .0005. just don't go over high side spec of rod housing bore
Try to polish that off crank won't be good,can't remove that much evenly by polishing
BTW if make journal .001-.0015 smaller clearance will open up around .003 or more,I think you meant you want to increase your clearance .001-.0015,but thought I would mention that just in case
Mike Taylor 3601