Posted by trucker40 on August 02, 2009 at 10:50:52 from (69.149.15.66):
In Reply to: Engine rebuild? posted by Bill in IL on August 02, 2009 at 07:00:10:
If you pull a hair out of your head and measure it with a micrometer its around 7 thousandths.If your cylinder has enough ring groove that it will catch your fingernail,its probably more than 10 thousandths.10 thousandths is as much as you can go if you want the rings to last a long time.Over that and every time they go up and down it is like twisting a piece of wire and after a while they will break.Harder rings break quicker.Now I have put new rings in a worn out motor and it quit smoking and ran a lot better.The main thing is deep scratches in the liner straight up the side that wont come out when you hone it,will let oil past the rings bad.If you just used it for light work and not a whole lot it would work for a while.I think I remember them saying about 10000 miles on a motor in a car before the rings give up on egg shaped cylinders.Say it went 20000 miles,and old motors would run 100000 miles new,so you could expect about a fifth of the life or less.Depending on what rings cost compared to the whole thing would be how I would decide.If you can get rings for 50 dollars and not use the tractor much and lightly then,it could last years.If you put it all in it would probably put out more power than it did new and last a long time,plus you should have the valves ground probably too since the head is off.A head can cause one to smoke especially if the seals are gone off of the valve guides. All motors have blow by.Some seem bad but run a long time like that.Watch a tractor pull some time and you might see one shooting a lot of blow by but pull out the gate.If its burning oil and doesnt have compression and lots of blow by is a sign its worn out.Also Im no engineer,but I think if it ever got real hot it might not be worn out,but the heat might make the rings loose some tension and cause blow by. Also when I took the rings out of my H and compared them with the new ones,the old ones were about half the size of the new ones.Mine was blowing oil out of the exhaust pipe and had non foulers on the plugs to stay running,and smoked bad all the time it ran especially when you first started it.The head was worn out and 4 of the valves all of the guides,rod bearings,sleeves,and it still ran alright,but about half the power it should have.Running it would get oil all over you in just a little while.
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