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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xj-s] Re: Valve Stem Seals
>>First off, the OD needs to be some sort of standard since the recess itself is cut >>with a bit. I didn't expect this, I thought they'd be cutting the recess with a >>tool with a variable diameter and could make it whatever size they wanted. >> >> Anyhow, in concert with this, they couldn't care less that Jag >> offered oversize valve seats, they were providing their own -- in the > >I'll bet that the interference fit you ended up with is known to be ideal >-- do you know what it was? Does this mean that the hot tip is to have >ALL of your inserts replaced with generic aftermarket parts? OK, lets hear some opinions from some machinist & Quality Control people. I am going to make the assumption that Jaguar also used a bit to cut the recess originally,(rather than an adjustable tool) even if it was a special tool that only served that one purpose. In addition, I am going to assume that all valve seats were "expected" to have the same OD.. The question comes when we consider what variations in size are possible when drilling "the same" hole with the same bit, and what variations are possible from one bit to another, or from a new bit to a worn one? Likewise, what variations are possible in the manufacture of "standard" sized valve seats? Bottom line, I suspect that you will only see an improvement in the situation when you are shooting for tighter specs than what Jaguar used at the factory. Follow-Ups:
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