ruined heads? - Team Camaro Tech
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post #1 of 6 (permalink) Old Oct 26th, 00, 06:23 AM Thread Starter
 
Join Date: Jul 2000
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Well. Like an idiot was doing some home polishing and did not put valves back in chambers. Did some minor sanding on valve seats on two valves. not much but I can tell where I hit them. Wondering if I ruined the heads or if there is a way to check before installing heads.
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post #2 of 6 (permalink) Old Oct 26th, 00, 07:34 AM
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Go to Sears, or an automotive store like AutoZone, but get a kit to lap your valves. Our you could get a little suction cup (like something used to stick on walls, refrigerators, showers, etc.), and place it on a small straight stick or rod. Then purchase some soft valve grinding compound.

Uniformally place the valve grinding compound around the seating surface of the valve. Place the valve in the head. Using the rod or kit with the suction cup, place it on the valve and rotate it in a rapid fashion, kind of like twisting a stick between your hands trying to start a fire. (By the way, has anyone ever accomplished that?) apply lite to moderate pressure. When the valve grinding compound turns a different shade of gray, probably light gray, pull the valve out of the head, clean off the compound and inspect. You will be able to notice if the grinding compond hasn't affected any areas, indicating the area will not seal.
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post #3 of 6 (permalink) Old Oct 26th, 00, 07:38 AM
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bob,
Try hand lapping the slightly damaged seats with a very small piece of fine wet or dry emery paper or clothe held under an old valve and turned to lap the seat. When it "looks" good, put some marker ink on the seat and check the lap for uniformity. This isn't the best thing to do, but it beats canning a head or having to take it and its mate to the machine shop and do both heads to keep them balanced. pdq67



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post #4 of 6 (permalink) Old Oct 26th, 00, 10:39 AM
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Leak test after lapping the valve.
Install both valves and a spark plug and put some solvent into the chamber, see if it leaks into the port.
David

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post #5 of 6 (permalink) Old Oct 27th, 00, 07:24 AM
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Bob, do as you please, but I recommend my suggestion because there is a good possiblity that if seat isn't to bad scarred, lapping the seat will not only identify a problem but fix it as well.
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post #6 of 6 (permalink) Old Oct 27th, 00, 03:14 PM
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Bob,
I have seen more heads ruined from lapping compound than I would care to tell you, especially the "gravel" that comes in most of the lapping kits.
Take the heads to your machine shop and ask them to just touch up the couple of seats that you hit. Its about a 20 min job and really should not cost that much at all. Probably less than the price of the second set of head gaskets you will have to buy if you bolt the heads on and they are not right ! If you hit it with the sanding roll, you probably did enough damage to get it re-ground.
Just my opinion, and no... I am not trying to be a salesman for my fellow machine shop owners

PS: your e-mail address does not work.

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