The Good, The Bad, And it Gets Ugly

By Jim Tapp
Goodson Tech Service (retired)

Is the grinding or cutting of valve seats taking way more time than necessary? Does it seem that hardly any of the seats are finishing on the same plane? Can’t seem to get a handle on what happened?

Is it bad leveling?
A defective cutter?
A non-concentric pilot?

Wow, we have all kinds of possibilities! And after we have eliminated one cause after another, we give up. Hey the seat’s good enough!

Not knowing the real problem, it becomes a living nightmare, head after head after head.

Ask yourself again, what have you forgotten? What else could be causing this problem? It’s easy to overlook the obvious – Replacement thick wall valve guides.

It would be wonderful deal if all replacement false guides were manufactured consistently and concentrically, but they are NOT. It has been my experience that it’s about a 50-50 dice role. Getting cast replacement guides to check out at a T.I.R. less than .001”, as they are guaranteed to be, doesn’t happen. Please don’t get me wrong, there are many guides manufactured perfectly, but they are usually a little more costly. Like always, you get what you pay for, hopefully.

How the heck do I check valve guides quickly and accurately?

With the Goodson Valve Guide Run-Out Gauge, of course. It takes a little over a minute to check a set of 16 valve guides for concentricity on both ends, after a short set up time.  This allows you to be in control of your valve seat work. NOTE: Unfortunately, this tool is no longer available from Goodson.

Need a little more information about this or any other Goodson tool? Call the Goodson Techxperts at 1-800-533-8010 or shoot us an email.

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