<VV> Rod Bearings

[BobHelt at aol.com]

In a message dated 6/11/05 10:20:15 AM US Mountain Standard Time, 
BrownD at bsci.com writes:

> but I wanted to get some
> opinions about rod bearings.  My basic question is why did they wear out so
> fast in my engine?
> 
David, 
There are too many unknowns here for an accurate guess. Below are some 
considerations that should be analyzed if you hope to get an answer.

Was just the one rod bearing worn, or are the rest worn too?

When assembled (rebuilt previously) was assembly lube used on the bearings?

What were the bearing clearances set to then?

What type of rod bearings were used? Were they Moraine 400? (i.e., aluminum?) 
or tri-metal?

At what point(s) was the bearing worn, how big was the worn spot, and 
location?

What is the condition of the crankshaft journal? Is it out of round/tapered? 
An OOR journal could be the cause of your problem.

It would be a good idea to now measure the bearing clearance with the worn 
bearing to see how bad the wear was. Then check the journal as described.

Regards,
Bob Helt