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Old 11-29-2012, 03:36 PM   #1 (permalink)
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Hard as a Rock

How in the bleep do you get crystalized burnt on carbon off exhaust valves? That's my last problem before I can start puting it all back together. Everything else should fall into place.
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Old 11-29-2012, 05:19 PM   #2 (permalink)
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Try soaking overnight in brake cleaner, and a wire brush. Kerosene may also work.

It may be that the only purpose for your life is to serve as a warning to others.
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Old 11-29-2012, 08:46 PM   #3 (permalink)
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A wire wheel buffer.
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Old 11-30-2012, 05:11 AM   #4 (permalink)
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You can:

1.) Soak in Seafoam

2.) wire brush on drill/scuffy pad on die grinder, but stay away from valve edge where it contacts valve seat, unless you're regringing the valves.

3.) we used to tape the stems off with duct tape, and bead blast them. However, they were also being recut.
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Old 11-30-2012, 05:41 AM   #5 (permalink)
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Seafoam works great, I've even used WD-40 and it works pretty good.
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Old 11-30-2012, 06:18 AM   #6 (permalink)
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I use my bench grinder wire wheel and Scotch pads with my die grinder. Both methods work equally well.
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Old 11-30-2012, 07:17 AM   #7 (permalink)
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I have already cleaned all the carbon off the heads and intake valves - they cleaned up very nicely. The face of the exhaust valves are another story. Seafoam, WD-40, carb cleaner, contact cleaner, paint stripper, naptha, nothing has cut it yet. It is harrrrdddddd.

I put an old sparkplug in the heads, turned them valve face up, tilted them so that the face of the exhaust valves would be submerged and soaked them using the above solvents to try to soften them, but no luck in the time I had so far. They probably soaked for two hours in various solvents.

When I take the valves out of the heads, I will try mechanical means to clean them.

Thanks for everybody's input.
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Old 11-30-2012, 08:04 AM   #8 (permalink)
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Oh, I thought you already had the valves out ! Cleaning them installed in the heads would be difficult to say the least, I guess you already figured that out !
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Old 11-30-2012, 08:17 AM   #9 (permalink)
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Would really like to know what works.
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Old 11-30-2012, 08:18 AM   #10 (permalink)
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Quote:
Originally Posted by bikedelic View Post
I have already cleaned all the carbon off the heads and intake valves - they cleaned up very nicely. The face of the exhaust valves are another story. Seafoam, WD-40, carb cleaner, contact cleaner, paint stripper, naptha, nothing has cut it yet. It is harrrrdddddd.
Which is basically......Seafoam.

Compare the MSDS sheets.
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