Posted by KEB1 on May 29, 2008 at 21:10:02 from (63.227.38.76):
In Reply to: engine overhauling posted by charley123 on May 29, 2008 at 08:19:01:
To actually answer your question, no it is not necessary to have the head resurfaced every time you take it off. If you have a good straightedge and a set of feeler guages, its pretty easy to tell if it's warped beyond spec.
How much effort you put into it kind of depends on what you're doing with the tractor. If you're actually rebuilding the engine, then its worth investing in having a machine shop check the head and do the valves. Haven't had a head rebuilt in several years, but seem to think it was in the $100 range for surfacing, magnaflux, & a valve grind. Parts if needed would be extra.
If your objective is just to get it running, you can generally get by with a lot less. Clean the head, check it as best you can for flatness, assume if you can't see any cracks that there aren't any serious ones, and lap the valves. Obviously, if the head is warped, has burnt or bent valves, the valve seats are worn enough the valves won't seat properly, or you see a crack, it needs to go to a machine shop anyway.
Valve clearance is set by adjusting the rocker arms, and you don't need any special tools beyond a set of feeler guages for that.
I've always had the best luck with a family owned & run machine shop. I haven't needed one since we moved to Colorado a couple years ago, but when we lived in California I found one that a couple of brothers ran. They did good work, had reasonable prices, were free with advice, and were very knowledgeable. They knew where to find parts for just about anything, and one time actually gave me a replacement valve for one I bent. Hard to find that kind of service any more.
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