Kendall:
I will assume for a moment that there was oil in the engine, and that
the oil pressure was good. What are the possible causes?
1. A defect in the bearing or the crank finish for that journal. This
can be created during assembly, as well as being part of the machining or
manufacturing process.
2. Lack of assembly lube in that journal for startup - although if the
engine is primed before startup it should not matter too much.
3. Incorrect bearing tolerance. This can be due to an error during
machining, *OR* installing the wrong rod cap or INSTALLING IT BACKWARDS.
4. Contamination of the oil. If this were the case, I would expect all
of the bearings to show some damage, not just #1.
CONTINUED IN NEXT MESSAGE TO AVOID HITTING THE TEXT LIMIT
Vance
Vance Navarrette
Cogito Ergo Zoom
I think, therefore I go fast
-----Original Message-----
From: 6pack-bounces+vance.navarrette=intel.com@autox.team.net
[mailto:6pack-bounces+vance.navarrette=intel.com@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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