Could be that the mechanic just cut corners. That's a problem with
not doing it yourself. What size bearings did he put in. If he didn't turn
the crank then they would have been standard size. By not turning the
crank he saved himself some money. All cranks don't have to be turned the
the marginal ones should be.
...Art
On Sun, 12 Oct 1997, Scott Gardner wrote:
> Well, Riqui and I left for Norfolk to begin our house-hunting trip
> today. 1200 miles since full rebuild, first time on the highway,
> since I've been breaking it in at varying speeds around town. Going
> about 65, temp between cold and normal, oil pressure at 55 psi, all's
> right with the world.
> Then, we get on I-65, accelerate to 75, and a quiet knocking starts.
> Five seconds later, it turns into a loud knocking, and the oil
> pressure has dropped to 12 psi. DRAT!!! Pull off the side of the
> road, and get a flatbed to haul us 100 miles back home.
> Looks/sounds like I've burned another main bearing. The rebuild
> work is under warranty, but I forgot to ask if that covers parts AND
> labor.
> Now for the fun question--Is this a fluke, or is my engine eating
> main bearings? the only thing I can think of is I have a pretty bad
> suspension shimmy at 70mph. Can enough vibration be transferred to
> the crank from the driveline via the clutch to overload the main
> bearings? I wouldn't think so, but the last time the bearings went,
> my wife had just pulled onto the highway about 10 miles previous, and
> the situation was pretty much the same. The knocking was a lot
> louder this time, though. Can anybody else think of what can cause
> engine bearings to repeatedly fail? I don't want to get in the habit
> of rebuilding the engine every 1200 miles, and since I'm being
> transferred to Norfolk the beginning of next month, I can't keep it
> off the highway for the rest of my life!
> Thanks,
> Scott
>
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