Re: How to or not ?

Posted by jdemaris on March 07, 2006 at 19:53:51 from (66.218.24.38):

In Reply to: How to or not ? posted by Ohio Mike on March 07, 2006 at 18:58:46:

Methods of, and reasons for, valve lash adjustment used to be a prominent topic of argument back in 20s and 30s.
For an engine to run at its best performance, setting by valve lash is NOT the best way - regardless of what your method of doing it is. The valve-lash clearance specs. provided by manufacturers are general specs., general enough to work on all of a particular engine series - regardless of age and/or wear, or variations from engine to engine, etc. When set to the required lash clearance, valve timing will be "close enough", there will be ample clearance for the valves to close, and not so much that they clatter too much. But, the clearance on each valve determines the valve timing. To get optimum performance, valves are usually set with a degree wheel and dial indicator - not a feeler gauge. On a tractor - yeah - who the heck cares - unless maybe you're pulling and every horsepower counts. It was very common with older cars being tuned for performance, and there were books written in argument of optimal valve adjusting.
Keep in mind, that generally speaking, excessive clearance makes a valve open late and close early, and too little clearance does the opposite. Setting the lash exactly to specs. will get you within an acceptible range, and that's about it.

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