8070 Cankshaft problems?

yOU KNOW, i HAVE HEARD THIS RUMOR ONCE MYSELF, BUT HAVE NEVER ACTUALLY SEEN IT. MAYBE DR. ALLIS WOULD KNOW

I personaly have never broke a crankshaft. We turn between 6500 and 7000 rpms have ran it with the dampner and currently dont use the dampner. And have never broke one.

I have taken alot of stock 426s apart with spun rod bearings and have never seen rod bolt failure.

Well in my personal opinion rod bolts are usually not the problem its bearing failure. Which is a very common problem with the 426. spin a bearing rod grabs crank and sumthing has to give.

        8070's weren't known for breaking crankshafts....7080/7580's were. Be sure to have your crankshaft magnafluxed by someone who knows where to look and especially on the nose just ahead of the gear. The cranks with a "keyway" for the front pulley would crack at the keyway area. Anytime there is a broken crank AND a broken main cap, the broken main cap caused the crank to break due to no support. I had an F2 combine years ago with the little 4 banger that broke a crank with less than 100 hrs on it and there was a broken main cap next to the break on the crank.

I wish I knew how all these "BS " rumors got started, was it a John Deere salesman or an IH rep, maybe some farmer whose cousins, uncles best friends hair dresser sister had one that broke, been with 426 engines for 35 yrs now, over hauled a bunch of them seen them clock 20,000 + hrs with moderate care, yet the only one I have ever seen personally come apart was one that had 5000 hrs on and had been repeatedly cooked for 2 yrs prior, when it finally siezed a piston and broke the cap off of the rod ( must be the rod bolt failure) and came out the side. Where does this rod bolt failure crank failure BS come from, it just isnt true. Have friends that run an est 1000+ hp on a super farm tractor on a stock AC crank, so a 170 hp is gonna break it or the rod bolts?????Pure BULL S**T . Reminds me of a farmer I met 3 yrs ago with a shed full of new JD equipment, and when he found out that I was an AC man he went on to tell me what junk they were he "said he had D-21 thru to the 7050 and they were nothing but junk and constantly broke down, I tried to ignore him for the first 15 minutes of his BS but finally couldnt handle it any more so I said well if they were so prone to failure what was failing the engines, his answer was no, the trannys? no again, the rearends tear them apart, well no, so I said what was the problem the headlights burnt out, the blinker fluid leaked ???? What be specific, when push came to shove it turned out he never had an AC was his neighbors and he heard he had all these problems..............yeah right.