Crank intact, one side of cap released by bolt shearing from rod and hanging cap got flung into the pan by a seized wrist bearing or bent rod

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GTO: "It's not too comfortable in here"
The Driver: "Yeah, It doesn't even have a heater...... It slows it down"
-Two Lane Blacktop

Classic case of not inspecting/lubing the muffler bearings.

Either that or the giggle pin fell off the laughing shaft!

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

This is what happens when the driver uses right-hand-drive turn blinker fluid in his left-hand-drive car.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Since the contest is still open, here is my guess.


The crankshaft broke at the rod journal, connecting rod is not on the crank (or is on a what is left of the rod journal) and struck the oil pan. The rod is on one piece but bent, and the piston has broken.

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"Mad Scientist" Matt Cramer
'66 Dart - turbocharged 225
My blog - Mad Scientist Matt's Lair

Looks like terrylittlejohn came the closes with his guess. Terry can start driving (and boat crossings) from New Foundland so he can collect on his prize in Samoa, CA... and do some racing with us with his blown SL6 car!

From what I see, #6 rod bearing spun and the owner kept driving. The bearing was completely shredded and destroyed, no piece bigger then a dime, spread all over the bottom of the oil pan.

The con rod's inner surface looks "jack-hammered" and the crank's journal surface has turned blue from the heat. The con rod bolts / nuts held, (sort of) as the rods "big end" exploded into 4 pieces. ( the main beam and 3 smaller pieces) At some point, one of the nuts was sheared-off the bolt... but those two pieces of big-end stayed together on the sheared bolt's shank.
Here is a photo of the mess left inside the oil pan:



The piston is in one piece but it has a big gouge up one side and a large crack down the other. The top edge of the piston is eroded away and the ring lands are collapsed from the piston over-extending into the combustion chamber. There are some little valve "tap dancing" marks on the piston crown.

The block and other bearings look surprisingly good for this level of failure. The biggest nick is on the bottom of the #5 cylinder (white arrow) and that has nicked the bottom of that piston but my guess is, that piston is OK and can be reused.
DD

And that, my friends, is why the slant six is revered so much! Anvil tough.

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If it was easy, everybody would be doing it.

ok doug, i hope some day i can collect on that meal and a race

Thats excatly what I thought,Dimound ring thing was my second guess,mark,,,,,,,kiddding ,my guess was way wrong