[Fot] Cam Bearings expansion

Scott Janzen sjanzen at me.com
Mon Jan 5 19:40:57 MST 2015


I've got a bit of cam bind in a new cam I'm installing in the GT6.  It appears to be a combination of slight run-out (i.e., the cam is slightly bent, 1/1000 of runout in the middle), journal size right at the factory maximum spec, and installed bearing I.D. that is at or below the factory minimum I.D.

It's also possible that the block is not bored perfectly straight as the binding is not consistent around the rotation, but another cam I have, with journal diameters 5/10,000 smaller, turns freely.  I have not checked that cam for run-out.

Question is, is there a tool to "expand" the bearings into the block and possibly gain a bit of clearance?  I'm told the factory manual for one of those Octagon cars calls for such a tool.  I'm using the typical Spitfire bearings.

Next stop is a machine shop with a crank straightening machine to see if they can use it to straighten a cam.




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