I tore down a late inline-6 that I had started and found to be pretty noisy internally.
Decent compression, but way too noisy IMHO.
It had been "recently rebuilt", but unknown to did it.
It had new gaskets & aerobic sealant at the crankcase-to-block seam.
The compression ranged between 130 - 135.
I couldn't believe what I found.
The initial general observations that raised suspicion included:
The top crankshaft bearing was seized in the end cap & easily slipped off the crankshaft.
The lower main bearing was also seized onto the end-cap, as well as having a correct pressed-on fitting onto the crankshaft.
The surface of the lower end cap was beat up, as if it had been the victim of internal carnage.
I lifted the rotating assembly , and found all the rings were free, but the skirts of #3 & #4 were significantly scored.
Then, when I inspected the block - I couldn't believe what I saw.
Although there is no visible damage to piston #6,...This poor beast had obviously suffered a previous extreme catastrophic failure in the #6 cylinder, and it had been "honed" (maybe?), and reassembled.
I have attached a few pictures of the damage resulting from a previously experienced failure.
Would any of you guys rebuild this block, after seeing the carnage seen in the attached pictures???
IMHO,...this crap is either off the chart, or I am too detail orientated & anal in my selections of a rebuild-able block.
doc