uneven bearing wear??

[iceman.chris]

just tore apart my red top, and found some sketchy wear on some of the bearings. most worn were the #1 main and rod bearings.

rod bearing from #1, other rod bearings were all normal (no copper showing)



bearing from first main cap





second main bearing, the other mains look like this too.

[boro drift]

The rod bearing looks starved of oil. The main bearing looks like it didn't crush properly.

Check the oil passage in the crankshaft that goes from the #1 main journal to the #1 rod journal. Make sure it isn't plugged up or partially plugged up.

[iceman.chris]

One guy on another forum said the following:

Quote »generally bearings don't wear evenly, especially on an old worn out motor.

Once one gets a small bit of wear or defect, it begins to wear quickly in comparison to the others. Whenever you get a motor for a rebuild due to shot bearings, its one shot bearing, not all bearings shot.[/quote]Can anyone confirm this?

[nelson8708]

Over tightened accessory belts can cause excessive #1 main bearing wear. Rod bearing looks starved as previously stated.

[iceman.chris]

I only run the alternator, no PS or A/C.

[iceman.chris]

Sent all the bottom end stuff to the machinist, hopefully a good hot-tanking will clear out any gunk that might be in the crank...