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TOPIC: How CRAZY is this???

How CRAZY is this??? 4 months 4 weeks ago #134882

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

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How CRAZY is this??? 4 months 4 weeks ago #134886

  • Dr.Go!
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Pretty sure that is why my rebuilt 1000 does NOT sound like that and runs quiet and smooth because the internal cylinder had NONE of the damage. Yikes. Isn’t this a case of if you only have one block to use that you over bore if you can clean up... and if not, then re-sleeve? ... or turn into a parts block and shop for another motor?

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Dr.Go!

How CRAZY is this??? 4 months 3 days ago #135094

The nick in the port is a worry, it could catch a ring and that will be the end of it. Usually marks below the ports are not too much of a concern if the ring does not touch them, but in all honesty I think I would scrap the block as there is a lot of liner distorsion as well evident. Should be fairly easy to find a replacement for that model.

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How CRAZY is this??? 3 months 1 week ago #135402

Hi Thom, no you are not too detail oriented. That block is scrap.

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Remember, my opinion in no way diminishes your opinion, nor yours mine. Collectively, there is a middle ground that is \\\"correct\\\" for the reader balancing all the input.
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