[snip]

but I never have seen proof of it!
    [snip]

    AFN
    Ron

    Bearing wash is a fact on small block Chevy engines, so probably on any
    insert type crankshaft bearing.

    I had a 283ci with a 60psi pump in it when I was a kid.  It was my
    daily
    driver and when I tore it down after 5 years of driving, probably 40-50k
    miles, every crank bearing was washed through the babbitt to the copper
    and then some.  The washout was only in line with the drilled oil hole
    in the crank, the rest of the bearings area only showed normal (sic)
    wear.................

    Kevin

What's washout?  Is that a hydraulic process?  Does it take abrasive?
Did the 283 have oil and airfilters?  Interesting.

Matt-

Matt-
I'm not sure that it's called a hydraulic process, but the oil under
pressure washed out the babbitt down to and including some of the
copper, which is the next layer before you get to the steel backing of
the insert.  It looked like a ring around the inside of the insert that
coincided with the oil hole if you held both parts of the insert
together.  It is kinda like using your pressure washer to remove grass
and weeds from the cracks in your driveway, the softer stuff goes first,
as well as that stuff that you point at and then the harder stuff
(concrete), dogs, small children, etc.

There was never any known abrasive in the oil.  I tore the engine down
for parts, it was still running well, and only then did I discover the
washout and I don't believe that it would ever have been a real
problem.  Only a spectro-analysis could have found it from the outside.
It had always had oil and air filters and I kept the oil changed as
needed.  That's all I know about it...............

Keven Jarvis




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