Posted by super99 on January 09, 2008 at 01:33:27 from (75.107.167.170):
I will give some background and then ask your opinions. I have a 70 gas that I bought from a dealer 12 or 15 years ago. It had sat in a fence row for years and then they got it running and traded it off and I bought it for $850. It seemed a little weak, but did what I needed it to do. Last few years, it got weaker and weaker till it would hardly start, I tore the head off and pulled pistons to do a valve and ring job, but the top ring grooves are burned out of both pistons. A friend did the head and it is good and ready to go. I took the block out and took to a machine shop to get checked out and it is OK and will bore out to .045 alright. This site has .045 overbore pistons for about $445 so I think I will order a set for it. I plastiguaged the rod bearings before I took them out, and they had .004 play in them. Machinist checked old bearings and said they were standard with .001 wear in them. I should be alright to put standard bearings back into it, shouldn't I? He said the cylinders had .025 wear in them. I think I should take the crankshaft bearings out and check them for wear and possible replacement. Should I have the crank turned down to next size bearing available? Would you take out the camshaft and have it checked? For no more wear than the rods show, I would think the mains should be wore the same, wouldn't they? It is going to need a new flywheel, the old one is cracked all over, but splines on crank are good. I'll be honest, I AM CHEAP!!! This is going to cost more than I planned on, but I want it to run so I can use it, and with the price of corn I guess this is a good time to spend the $$$. I didn't intend to have new everything in this old girl, but I will never be any closer than I am right now, What would you guys do? I am not concerned about being good as or better than new, I just want to run it till I die. I would use it to pull a 4 row planter and spray 65 acres and run auger, maybe take a 3 bottom plow to a plow day if they ever have one close enough that I can drive to it. Should I try to find a higher compression piston, or go with the standard .045 overbore? The rest of the tractor works ok, and with better rear tires, it should run as long as I will be able to use it. Your thoughts and questions please. Chris
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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