Re: "Acceptable" bearing clearance

Posted by Ken_P On 2015/4/27 20:37:17

I have not checked the crank at several locations with plastigage, but I did check the mains at several different locations radially. I believe my machinist did run outs and recorded either the average or the minimum diameter. For example, my measurements on #1 main:

2.7441
2.7455
2.7445
2.7436

He recorded 2.7405.

I have not plastigaged the rods, but the machinist report between .0078 and .0067 under spec.

To ensure I have the right numbers, I am using 2.7465" (+0 -0.001") for main journal diameter and 2.0944" (+0 -0.001") for specifications.

Assuming I can readily source 0.010 over main and rod bearings, I will likely go the grinding route. I am also going to a swap meet in Rhinebeck, NY this weekend- if I fall upon a virgin crank, I will pick that up instead. I have two cranks, but both are about equally worn, but my spare had the #1 rod bearing spin and or gouge the journal at some point in its life.

Thanks for all the info and advice- please keep it coming!