<VV> Rebuild II

[kovacsmj]

Stephen, 
 The plastigage goes on the bearing surface on the width IMHO. However,
I have very recent personal experience with using only plastigage in one
place per journal. When the block was separated. The plastigage
indicated I had virtually perfect clearances with the newly turned .010
crankshaft and .010 over bearings. This was just Murphy's Law!!!

 HOWEVER, when I reassembled the engine, the crank shaft would NOT turn
360 degrees by hand, but got hung up after about 270 degrees. Cutting to
the chase... the newly turned and nitrated crank had bowed during the
heat treat process resulting in the following journal runouts #1 .001.
#2 .003. #3 .004. #4 .001. I could actually see the runout while
rotating it in one crankcase half, now that I had a clue what to look
for.

 I suggest that plastigage be placed on each bearing half at least two
places 90 degrees apart. You can hold it in with a dab of oil/grease.
When checked, they should be virtually identical widths.

 The problem was solved with a replacement .010 crank that would turn
flawlessly.  Always remember to use lots of lube on the cam journals and
bearing journals before the final assy. I like to use a mixture of moly
disulfide and STP.

 Anybody else have better ideas / comments??????

Getting all the information is most of the solution.
 
MIKE KOVACS
 

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Stephen Upham
Sent: Wednesday, March 23, 2005 11:10 PM
To: virtualvairs at corvair.org
Subject: <VV> Rebuild II

	I need some help from anyone who has used Plastigage to measure
the 
bearing clearances on a crankshaft.
In the service manual, it says to:
	 "2. Place a piece of gauging plastid the full width of the
bearing 
Parallel to the crankshaft on the journal."  SNIP ..........

......Any help will be appreciated.  Anything you tell me will have to
be 
explained pretty simply as I've never been this deep into an engine 
solo.

Stephen
Corvairium II

 _______________________________________________
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 
 _______________________________________________