.010" undersize requires a journal that is .010" smaller diameter, regardless is only .005" per side. Making any journal smaller makes it less strong.
I never said using undersize journals breaks cranks. I said it makes them weaker. Take a high-hour engine that will already have some metal fatique, and then grind it undersize - and it has to make it weaker - unless you have some magic process that makes less metal, MORE strong. We had a few .030" under cranks break. Now - as to why? I assume there were long-hour fatique cracks, and grinding .030" under was the "straw that broke the camel's back." Also, Deere claims that any crank-dampener with over 10,000 hours should be renewed it it also leads to broken cranks.
My point was, an still is - to blindly grind a crank that might not need it - is foolish. On the other hand, if a crank has bad journals - then there's aren't many options. Spray-weld the journals, grind undersize, or buy a new crank.
Deere sold .001" and .002" undersize bearings to install in standard cranks with slght wear. We did many and it's a very fix for machines that are only slightly out of tolerance and have low hot oil pressure at engine idle.
Just because a company sells a product to fix engines, does not mean, or prove - they certify it a fix "as good as new." Often the purpose is to get more use, that's all. Deere also allows undercutting armatures on diesel starter-motors - but also says they will not have the endurance of a new armature with a full-size commutator.
There are some old Deere #s for .002" bearings. Knowing the way Deere has dropped much of its parts support, they probably have to be source aftermarket now.
AT21108 0.05MM (.002" under) US, PLAIN (PKG. OF 2 HALVES) (2 USED GASOLINE) (4 USED DIESEL) Mains
AT21122 BEARING 4 0.05MM (.002" under) US (PKG. OF 2 HALVES) Rods
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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