If you are just putting on a new head gasket for what ever reason (like leaking?), and not doing anything down below, I wouldn't worry about it. I wouldn't tear the bottom end apart if all I was doing was a head gasket. No need in going down there, unless you suspect a problem.
Now if you were putting on a rebuilt head, and or new rings, or doing somewhat of a partial overhaul, it'd be a good idea to check things out. Or if you had the bottom end apart and was there anyways, it'd be a good time and idea for new bearings.
As others have stated, better know what your doing when replacing rod and main bearings. Alot more skill level required in changing bearings, than say, changing the oil or a head gasket. It takes more know how. Not really so much in doing it by the book right, but knowing what'll work, and what won't. Knowing what your looking at. New bearings isn't going to do any good if it has a scored up crank. An experienced mechanic that has seen some bad ones, and some good ones, can tell alot by just looking. And tell more by measuring. And the measuring thing is an art of its own. Alot of preciseness to doing that. No room for sloppiness when it comes to the measuring. Or really for doing overhauls in general. Sloppy work will lead to big problems.
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Today's Featured Article - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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