Jack, what was the breakdown between the three failure modes - rod,
bolt, bearing?
Jack W. Drews wrote:
> Thanks to all who contributed to our collective knowledge on the
> subject of "which rods fail first". There have been a number of
> responses since I sent out the first results, and the pattern is
> significant enough that I thought you would be interested in a grand
> total.
>
> We got responses from 16 drivers, including Effinger, Kastner,
> Gillanders, and Solow. There were a total of 46 failures noted. I've
> listed all failures irrespective of cause, like bolt breakage, rod
> breakage, and lubrication problems.
>
> Tally:
>
> #1 rod - 0
> #2 rod - 17
> #3 rod - 24
> #4 rod - 5
>
> I found the numbers interesting for a couple of reasons.
> First off, it's obvious that the preponderance of failures occur on #2
> and #3.
> Secondly, there was a mixture of rod failure, bolt failure, and lube
> failure as the attributable causes. Isn't that strange? Why would rods
> and bolts break more frequently there instead of those failures being
> evenly distributed?
>
> Another puzzle to me is that not one failure was noted on #1. I would
> have expected just the opposite, because with the distributor bushing
> intersecting the gallery between the supply hole from the pump and the
> #1 main, I'd expect it to have the least oil. But I guess I would have
> been wrong.
>
> Anyway, I'm going to continue to drill out the center main oil feed
> holes, and I wonder if I should also enlarge the hole in the main
> bearing shell as well, opening it up to the new diameter of the hole
> from the gallery to that main.
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