[6pack] New Engine AUTOpsy Part II

[Craig]

Was this engine assemble than left in a corner,
some place for around a year or so.
Than placed in the car to run.
Craig
----- Original Message ----- 
From: "Navarrette, Vance" <vance.navarrette at intel.com>
To: "Kendall Larsen" <mailkendall at sbcglobal.net>; "6pack List" 
<6pack at autox.team.net>
Sent: Monday, September 08, 2008 12:12 PM
Subject: Re: [6pack] New Engine AUTOpsy Part II


>        Continued from previous message.
>
>        You have damage in other bearings, not just the #1 crank throw.
> However given the chunks laying in the pan it is possible that the damage 
> to
> the main bearing and the cam bearing are collateral. Clearly the crank 
> throw
> is toast - it looks unrepairable to me unless you are willing to spend big 
> $$.
> Better to source another crank. You will also need to install cam bearings 
> as
> the journal for the cam in the block is almost certainly damaged as well.
>        Given the severe damage to the #1 crank throw - I will say that 
> there
> was a bearing clearance problem on that journal - it was too tight. This 
> can
> be due to a wrong size bearing or mis-sized journal. It is also possible 
> to
> install the wrong bearing cap on the rod, or install the cap backwards, 
> which
> will also cause damage.
>        If the machinist assembled the bottom end, I would say it is his
> responsibility. The bearing clearances are supposed to be checked, and 
> when
> the bottom end is assembled the machinist should have spun the crank to 
> make
> sure it moved freely. Trust me, if install a bearing cap incorrectly or 
> there
> is a tolerance problem, you CANNOT move the crank by hand. Ask me how I 
> know.
>
>        Vance
>
>    Vance Navarrette
>    Cogito Ergo Zoom
>    I think, therefore I go fast
>
> -----Original Message-----
> From: 6pack-bounces+vance.navarrette=intel.com at autox.team.net
> [mailto:6pack-bounces+vance.navarrette=intel.com at autox.team.net] On Behalf 
> Of
> Kendall Larsen
> Sent: Monday, September 08, 2008 2:47 AM
> To: 6pack List
> Subject: [6pack] New Engine AUTOpsy
>
> List,
>
> <snip>
>
> Here are some pathology pics of the damage. Cylinder 1 rod bearing spun.
>
> http://picasaweb.google.com/kendalll/TR6Engine08#
>
> So we now know what what the loud noise was, but the question is why, and 
> what
> do I do to keep it from happening again?
>
> The rust on the rocker arm is curious.
>
> What are the possible causes for a rod bearing to spin? This engine 
> probably
> had less than 5 hours on it.
>
> <snip>
>
> Kendall
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