I have a 46 2-ton that I use for my business. I have had it for about 4 years and 2 1/2 of those years it has been in service and makes deliveries weekly. My employee's use it as well... Last winter I thought I would pull the engine to freshen it up. We were a little slow and I had about a 4 week window that i could afford to have it apart. It ran well, smoked a little and used some oil! But it ran well.
When I pulled the head I found aluminum pistons. I thought that was a good sign! Remember, it ran well. I thought I would freshen it up with new rings and reseal it... Well. It had .060 over 216 pistons in a 235 that had a .020 over bore at the bottom of the hole and... Wait for it... .040 over bore at the top of the hole. To simplify that.. Standard bore pistons in a .040 cone shaped hole...
I had purchased a crank and rods on eBay to swap over to full pressure oiling, but I found that the babbit bearings were perfect. I ended up having the pistons that came with the rods fitting to the bores, ground the seats and reassembled everything.
My point is, I had less than 4 weeks of the truck being apart and my engine is now rebuilt and looks great. That was last winters project. This winter I pulled the cab off and restored it as well as building a new bed!
