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Here is my first S2k, and she decided to chew her bearings within the first 1000 miles from the purchase. The S had about 70k miles. Oil was ok, and it happened during enthusiastic driving on a mountain road.
Now, while I will be looking for a replacement engine, as a learning process I want to rebuild the bottom end myself, even knowing that probably it won't last long (after reading several topics on this forum).
I will look for a machine shop that could check the crank. As far as I understood, up to 0.01" could be machined, although better stay within 0.003". Here my hopes are quite low, because on the journal I can feel with my finger the central groove (where the bearing has the slot for the oil). While on the other journals it feels flat. Regarding the finger nail test, I can feel the scratches while dragging across the journal, but they are not as deep to actually "lock" the nail in. Not really sure what is the critical point to understand how sever the damage is. I can only say that the other main journals also are not perfectly smooth, and tiny occasional scratches could be felt. On the other hand, all the rod journals are perfectly smooth, and all the clearances in perfect spec after plastic gauging them.
The bearing itself has deformed quite a lot. In fact it cannot even seat tightly in its housing as it is smaller and falls off. In contrast, trying the bearings from the other webs, they lock in the 5th housing nicely.
Finally, the dent on the block from the spun bearing...something that I could not find anything about on this forum and elsewhere. As you can see in the attached pictures, the bearing has made its way into the block. Does this mean that the block is garbage? Or are there ways of fixing it?
All the cylinder walls look good from the bottom. And the compression was really good too (measured before breaking the bearing as I bought the S).
Spun 5th Main Bearing - Block dented
