<VV> Main Bearings - how perfect does the surface need to be?

[BobHelt at aol.com]

In a message dated 6/21/2008 7:42:01 AM US Mountain Standard Time,  
bwschug at charter.net writes:

Interesting scenario. But Bob, if there's a scratch, that means   
there's an actual groove or gouge in the metal. You say that's okay,   
but that there shouldn't be any metal sticking up. But, if there's a   
groove, where did the metal go that was in the groove? Was it  removed?  
Was it compressed? Was it raised? It seems to me these are  the only  
possibilities and that the last one, that the metal was  raised is the  
most likely scenario. So, if there's a scratch and the  metal was  
raised, then the clearance is no  longer constant,  right?

Bruce



Hi Bruce,
Please go back and re-read my posting. I think that you missed what I was  
saying.
Regards,
Bob Helt
 
In my opinion, the surfaces that contact the crank should not have  any
raised portions due to gouges. Small indentations won't hurt. If   
there are any raised portions either file them down or gently tap them back  
in  
with a small hammer (ball peen is best). Just remember that you  want a 
constant  
clearance of about 0.002 in. between the journal and  the bearing.
Scratches probably are all Okay because they likely contain no  raised
material.




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