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I am just finishing an engine rebuild for my NAA. This is the first rebuild I have done, and it has been no problem. The engine is back in the tractor, but I haven't put everything back on yet to check out the finished product. I had someone make me a sleeve puller (just a "puck" that fits into/over the sleeve to pound it out) and it was no problem. I left the engine inside the house (60 degrees or so) and the new sleeves outside (15 degrees or so) to make it easier. Took about 2 minutes per sleeve to drive them in. Installing the new ring gear was probably the hardest part. It just didn't want to go on, and the flywheel soaks up the heat pretty quickly which keeps the ring gear from staying hot enough. Total investment is about $1000, including the full rebuild kit, new clutch, rebuilt pressure plate, flywheel machining, crank polishing (didn't need to be ground), and cyl head work (grinding valve seats and pressing in new guides). I've spent about $30 in new tools, including a valve spring compressor, clutch alignment tool, and piston installing thing. Its been a fun project. Give it a try. -John
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