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Rob
05-19-2003 09:00:50
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6v 2N starts great down to 20 degrees outside and has enough power for a 5' bush hog. She smokes, has 75psi on #2 & about the same on #1, #2 plug fouls all the time (fires sometimes) and the tractor uses 1qt/hr oil. Opened front valve chamber and #2 intake valve guide is broken, #2 exhaust port is oily, and springs don't have any paint on them. Remove head and #2 exhaust seat is burnt. Ordered new mushroom valves, split guides, retainers, and springs for #2.
Picked up a valve lapping stick, grinding compound, and 80 grit plumber's roll (emery cloth)for about $15.
Removed the valve spring retainer on #1's burnt exhaust valve and used the emery cloth to remove mat'l from the end of #1 exhaust valve until I had 0.014" tappet to valve clearence and started lapping badly burnt seat. Didn't have to remove the spring, just propped it up with a couple of bolts so I could get between the valve stem and the tapper. Took a full days work to lap but she's done now. It's not perfect, had to stop because other specifications I couldn't do anything about, like valve seat width, were at the limits. The valve is now seating, one place it's not a full 0.070" but it's a seat. Those valves are still out of tolerence as far as valve to guide clearence but that valve is looking one whole lot better then it has in a lot of years. $15 and I have the tool and supplies enough to do all the valves if I want. Now I see I shouldn't have removed #2 exhaust valve. (I ruined it getting it out.) I could have left that broken guide in there too, that wasn't my problem. Bottom line, lapping the exhaust valves takes a lot of elbow grease but it only costs $25 including gaskets. The compression will be up so she might start a lot easier under 20 degrees and maybe she won't burn oil for another couple-few hundred hours, we'll see.
That's a shade tree valve job. Reminds me of when I was a kid and I didn't have any money to keep my '56 chevy running. This isn't for everyone but I get a certain satisfaction keeping the old Ford running without relying on a lot of outside help. I also enjoy avoiding machine shops and their labor rates.
Any of you skin-flint kids don't know how to lap valves just ask.
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