<VV> Rebuild II

Harry Yarnell hyarnell1 at earthlink.net
Sat Apr 9 13:29:23 EDT 2005


You can't put TWO strips of plastigage in a bearing at the same time. All
readings will be WRONG!

Harry Yarnell
perryman garage and orphanage
perryman, MD
hyarnell1 at earthlink.net

----- Original Message ----- 
From: "Stephen Upham" <contactsmu at sbcglobal.net>
To: <virtualvairs at corvair.org>
Sent: Saturday, April 09, 2005 12:18 PM
Subject: <VV> Rebuild II


> Well, I finally got around to Plastigaging the new (used) crank.  I put
> a pair of gauges in each of the mains at the 7:00 and 1:00 positions of
> the bearings as you face the engine from the pulley side.  I followed
> the bolt tightening sequence per the shop manual and increased the lbs.
> of torque from 20-35-53 graduating in order.
>
> On the crank shaft which was positioned to TDC I found the following
> readings from the front of the engine to the back.
> Journal #1- 11:00 position (.001+ the width of the .003.5 part of the
> measure gauge, which I would assume means that I have less than .001
> clearance)
>                          5:00                (.001)
>                 #2- 11:00                 (.015)
>                          5:00                (.001)
>                 #3- 11:00                 (between .001 and .0015)
>                          5:00                 (.001 + the width of the
> .015 part of the measure gauge)
>                 #4- 11:00                 (.001 + the width of the .002
> part of the measure gauge)
>                          5:00                (.001 + the width of the
> .002 part of the measure gauge)
>
> On the bearings:
> LHS (left hand side.  All at 7:00 position)
> #1-  .001  + the width of .0035 (approximately) part of the measure
> gauge)
> #2-  .001
> #3-  .001 + the width of .001 (approximately) part of the measure gauge)
> #4-  .001 + the width of .0035 (approximately) part of the measure
> gauge)
>
> RHS at the 1:00 position
> #1- .001 + the width of .0035 (approximately) part of the measure gauge)
> #2- .015
> #3- .015 (actually slightly longer, but difficult to measure[1/32 of an
> inch?]
> #4- .001 (actually slightly longer, but difficult to measure[1/32 of an
> inch?]
>
> Something tells me not to use these (standard size) bearings, eh?
> Also, I'm feeling that I need to micrometer the crank as it seems (from
> these various widths) that it is out of round.  I don't have a
> micrometer nor have I ever used one, but Auto Zone says they have one
> for $30.  Does that sound reasonable, or would it likely be a POC
> (piece of crap) and thus useless?
> I also have a set of rod bearings (also standard) that I haven't taken
> out of the box to Plastigage yet.  Would that be a waste of time
> knowing what I know now?
>
> Stephen Upham
> (strong contender for the '05 Ralphie Award [the award for the worst
> Corvair hard luck story] )
>
>  _______________________________________________
> This message was sent by the VirtualVairs mailing list, all copyrights are
the property
> of the writer, please attribute properly. For help,
mailto:vv-help at corvair.org
> This list sponsored by the Corvair Society of America,
http://www.corvair.org/
> Post messages to: VirtualVairs at corvair.org
> Change your options:
http://www.vv.corvair.org/mailman/options/virtualvairs
>  _______________________________________________




More information about the VirtualVairs mailing list