Posted by dr sportster on May 31, 2014 at 09:58:56 from (68.192.202.137):
In Reply to: cylinder head posted by 68vert on May 30, 2014 at 11:56:31:
Another thing when you install the guides the holes will reduce even more than when measured before installation. You will then have to ream them to clearance for the valve stem diameters. If you go to a shop they will more likely hone them to size and they will cut the seats on a modern Serdi machine [ or Sunnen.] The way to find the size of the hole in the guides is with the pilots for the valve work. If you don't have a set of pilots you will have difficulty with a small snap gauge and mike. The pilot is reality. The seats widths must be cut to the specs in the service manual [ too wide they overheat ,too narrow they overheat] and the clearance between guide and valve stem must be correct [especially for the exhaust stems/ guides] Otherwise the stem will hang in the guide and then the pistom may strike the valve head bending the valve [overhead valve engine].The cause could be either too tight guide clearance or wrong seat width causing swollen overheated stems closing up clearance on the stem. Back to square one. Whatever money you pay a competent machinist is well spent unless you are equipped for the job and the price charged is fairly reasonable for the work.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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