[ihc] Re: ihc-digest V7 #480

[Colin M Rush <salmineo@xxxxxxxx>]

Kyle,
        That looks and sounds like the remains of a bearing.  I would
guess it is a big end bearing first, or a main bearing second.  I would
pull the bearing caps on the rods one by one, and look to see that they
are all right.  I can think of a fix quick, but will hold my tongue until
you find the bad rod or main journal.  When you find it, be sure to get a
picture of it, or at least a good description of what you find.
-Colin Rush

Date: Thu, 20 May 2004 21:23:25 -0700
From: Eighteen Rabbit <thor7358@domain.elided>
Subject: [ihc] 266 w/ knock -- forensics help requested!
 
IHers,
 
     The left bank of the 266 in my Scout 800 has been knocking since I
purchased it a couple years ago.  I was told the sound was probably a
worn
cam lobe, and I didn't worry about it too much because the oil gauge read
right in the middle at road speeds.  (Well, I worried, but I still drove
the
truck.)  It still sounds about the same, but after I watched the oil
pressure drop on a trip last spring, I have hardly touched it.  Hoffs
suggested I try running an extra quart of oil, so I tried that, but
everything ran the same as before.
 
     In the mean time, I have changed all the lifters and push rods on
the
left bank.  I also installed a replacement rocker arm & rockers.  It
still
knocked, so I changed out the water pump, thinking that could be the
cause.
I performed the tests in the factory service manual to see if the sound
was
from a loose piston pin or worn/loose rod bearing, but it passed those. 
The
last thing I wanted to do is pull the cam shaft!
 
     As a final resort, I thought the oil pump could be going bad, so I
dropped the oil pan.  Much to my dismay, I found some metal in there!  I
am
not sure how much of the small stuff I missed, but I salvaged some of the
bigger pieces.  It looks like it was in a strip, about 3/4" wide.  It is
non-magnetic and about as malleable as lead.  Maybe a shim or something?
 
     For those of you who have experience with engines, I have posted
some
photos on the web for you to look at.  Hopefully you will recognize the
pieces!  http://www.uidaho.edu/~thor7358/IH/  Also, how likely is it that
the source of this debris is the source of my knocking?
 
Thanks,
     Kyle Thoreson

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