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Lapping valve seats

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Bill in Mich

06-01-2002 16:48:46

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Does anyone have an easier way to dress up valve seats on a 9N other than the suction cup stick with valve compound? Tiny pits in them and the stupid suction cup keeps popping off. Thanks for your help both now and in the past.
Bill

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George Willer

06-02-2002 06:34:52

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Re: lapping valve seats in reply to Bill in Mich, 06-01-2002 16:48:46

I often grind and shape valves in a lathe using a tool post grinder, but had no good way to do seats. If the seats merely need touching up (usual), here's how I do it if the margins aren't too wide:

Find or make 8 washers with exactly 1/4" holes...the thicker, the better. Drive a 1/4" hex screwdriver bit through to make a hex drive hole. Dress the surface flat. Now, stick a washer to each valve using CRAZY GLUE! The driving power will amaze you. I use a cordless drill with the bit in backward, reversing it often. The washers easily pop off when finished.

Wire the washers together with a tag and put them in that special place for the next time. Mine have been re-used many times.

George Willer

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Al English

06-02-2002 05:30:44

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Re: lapping valve seats in reply to Bill in Mich, 06-01-2002 16:48:46

Hi Bill,

There are hand cranked tools that save you the work of manually oscillating the lapping tool, but these also use a suction cup. If your suction cup is worn, or getting hard, it will do as you described. Otherwise, a little moisture will help. And as Ron pointed out, lapping is not a substitute for properly re-grinding and/or re-cutting the seats and valves faces. God luck...Al English

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Ron/Pa

06-01-2002 18:57:35

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Re: lapping valve seats in reply to Bill in Mich, 06-01-2002 16:48:46

I have on occassion clamped the chuck of a drill on the valve stem, and pulled as I spun it. This is not a recommended method because if you let the valve spin in the chuck just a little, you can consider it toast. However I manage to do this without damage as long as it does not require major lapping. As I am sure you know, the best method is to send it to a machine shop that you know and trust and let them do the job right. Ron

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