All tolerances were checked and within specs. The engine had about
500 miles on it. used a straight 30 weight oil for break-in. The
engine temp never got over 190 degrees. when I built the engine it
turned over freely without the plugs in so I don't think I missed
the bearing pin when I assembled the crank. the end play was set
with a dial indicater to proper specs. the only thing I can think of
is a restriction in the oil galley going to the bearing. it has a
very small hole for the oil to get thru and wouldn't take much to
block it. I will have the block boiled out and all oil galleys
checked again. --
Mark
Bob Perring <perring@xxxxxxxxxxxxxxx> wrote:
That would sure do it.
It is amazing what a slight clearance difference will do to oil flow
restriction when sleeve bearing tolerances are too tight.
Bob
====================>
At 05:48 3/28/2006, you wrote:
>I have seen it a couple of times. If the oil galley is plugged it
>will run for just a couple of minutes before seizing. Sounds more
>like the dowel pin hole is too shallow causing the pin to push on
>the bearing slightly.
>
>
>----------
>From: tcb-bounce@xxxxxxxxxxxxx [mailto:tcb-bounce@xxxxxxxxxxxxx] On
>Behalf Of Mark Sawyer
>Sent: Monday, March 27, 2006 9:20 PM
>To: tcb@xxxxxxxxxxxxx
>Subject: [tcb] Ronnie's engine
>
>Found the problem. It's confusing the devil out of me. The #4 main
>bearing next to the pulley had seized. This is one I have never seen
>seize before. I was expecting the front main next to the flywheel.
>The block is still standard so a .10 line bore is in order. The
>crankshaft is standard as well so a .10 turn is in order for it as
>well. Has any o ne ever seen this bearing go out???
