My local Deere Dealer's Service Manager told me 15 years ago around 6 - 7000 hours was average for an overhaul at that time for 70's, & 80's model year tractors. But greatly depends on how they are used, & how rough they are used. A very low hour tractor can have rust form in the cylinders for example if the tractor is ran a few times a year, or less. That 1986 500 hour has about 20 hours per year on it. Did it sit 10 years, & internal corrosion build up. It might work but with 25, or 50% of normal compression. Just something to think about.
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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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