<VV> Rebuild II

[AKG]

That's why you should have your crankshaft straightened before using it in a
rebuild..

The Artful Dodger

> From: "kovacsmj" <kovacsmj at sbcglobal.net>
> Date: Thu, 24 Mar 2005 19:48:58 -0500
> To: "'Stephen Upham'" <contactsmu at sbcglobal.net>
> Cc: VV <virtualvairs at corvair.org>
> Subject: RE: <VV> Rebuild II
> 
> 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
> 
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