Posted by pete 23 on July 16, 2012 at 14:00:52 from (74.32.238.2):
In Reply to: 400 valve adjustment posted by ajdeereman on July 16, 2012 at 08:19:25:
The reason I do the top dead center way of adjusting is that way all valves will be assured of being set the same. When you use the short cut chart method, some of the tappets are on different portions of the cam lobe than others are. On these old four bangers it doesn't really matter but on the six cyl there is a slight difference as the ramp on the cam lobe starts quite a ways from the bottom of the lobe. If you have a higher performace cam you can really get in trouble. Janicholson's method will work on all valves the same also with no problem , just that I never used that method. On a high performance camshaft, the hot rodders recommend adjusting by turning engine to where valve is wide open, then turning engine one full revolution to know tappet is at heel of cam. Way back, even before my time, IH was talking raised ramps on their camshafts. My original boss at the IH dealership dug up an old service bulletin relating to that very subject and I believe it was for the first Silver Diamond 6 cyl engines used in the pickup and trucks. Of course, we set all those with the engine running so that automatically puts you on the lowest heel of the cam and all the rockers and push rods have settled into their worn spots, except for the wear on the tip of rocker arm and valve stem. You can get an inaccurate reading when you have a groove in either or both.
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