Quote:
Originally Posted by NeighborsComplaint
quite possibly the stupidest excuse I've ever heard. Core shift occurs during casting and results in the off-specification location of a casting feature where there are voids needed in the casting. The core forms the void. When the core shifts, the void is formed off the intended location. Core shifts do not occur over time, the core is long gone from the casting process and the void is where the core formed it. Cast iron doesn't bend to allow a cast-in void to change position over time.
Basically Butler sold you a crankshaft kit of mismatched components and wants to pass the buck on the failure off on the "machinist/installer" knowing you are a novice. That's like them saying "We will rebuild your heads but you need to check all our work as additional machining may be required before you install." Jeezus, if you go to Autozone and buy any crappy re-ground crankshaft kit, the bearings fit the crank without machining.
The other thing I find unbelievable is that you were unable to discern an 8 cylinder engine was running on 5 cylinders. I can easily discern a single fouled plug on startup. When driven, the loss or power is much greater 12.5% (7 of 8 firing). With 3 cylinders down, you would have barely made it down the driveway much less drove it down the highway. Seriously? [B]Nobody[/B} drops 3 plugs in a row, lands them square on their electrodes so as to perfectly close their gaps, then installs them not noticing the gaps are closed. I have been wrenching on cars and snowmobiles for over 60 years and have never once seen a sparkplug come out of the box with the gap closed either.
I still say there's lots more to the story you are unwilling to share and I'll leave it at that.
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Core shift can not cause this issue. Its crazy to try and blame it on core shift.
Did the OP not spin his crank when torqued down ? There is a lot missing from this story. Plugs with closed gaps ???? When there is nothing about the bearing/crank fit that can cause the gaps to close.
If there was 3 plugs with closed gaps, what it tells me is there is more wrong with this story.
Right now I have a Scat 4340 crank in a block with FM performance bearings. Crank has the large radius's. Spins perfect in the block.
It just goes to show you that every little thing needs checked with these engines. Once you change a part like a crankshaft from OEM to aftermarket, take nothing for granted.