we got a gsr shortblock back at the shop that local machinist assembeld it spun some bearings and what not...

the specs on the motor are as follows crank was ground down .25mm and fitted with propper size rod and main bearings, but the thrust washers where standard size, im not understanding y they would have that standard size thrust in it instead of the .25mm (thicker) thrust????

witha crank being ground the thrust area would be ground down also correct, in which would need the .25mm thrust?

could this be part of the motor failure????

 

You do not grind the thrust faces on the crank, only the journal diameters. I personally would not have ground a Nitrided crank anyway. I bet the failure was caused by a lubrication or clearance problem.

 

the crank was scuffed up and needed to be ground down (journals)... yes i know that the journals are the parts ground down... i was wondering cause the bearings are marked .25mm and the thurst was marked std, thats why i ask...

thanks though

 

You do not grind the thrust faces on the crank, only the journal diameters

I bet the failure was caused by a lubrication or clearance problem.

It could also be a journal alignment issue.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Big Will &raquo;</TD></TR><TR><TD CLASS="quote">im not understanding y they would have that standard size thrust in it instead of the .25mm (thicker) thrust</TD></TR></TABLE>

Because there's only one size thrust bearing. If they ground the thrust surfaces there's trouble, as people have noted above.

 

The thrust surfaces of the crank work side to side if you will, not by a diameter as a journal does. Unless these "side" surfaces were damaged, they wouldn't be ground wider when the journal diameters were ground.

 

thanks for the input i know what casued the spun bearings... the thrust wahser is someting i have always wondered about, it was just a question for my noggin.......