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Join Date: Jun 2001
Location: Sweden
Posts: 5,911
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How to clean valves?
I have taken out all valves and exhaust valves are black and few of them have slight layer of carbon. What is the best way of cleaning w/o scraping them or making them rust?
Thanx!
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08-06-2003, 03:40 PM
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Location: TX USA
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Soak them for a day or so in a can of the vat-type carburetor cleaner ... the kind that comes with a parts basket. Berryman's Chem-Dip is the product here, but I am sure there is an equivalent product in your land ...
After soaking ... the carbon will scrape off very easily with a wooden tongue depressor or similar tool.
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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08-06-2003, 04:10 PM
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I use a wire wheel on the head of the valves.
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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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08-06-2003, 04:12 PM
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Location: San Carlos, CA US
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Bead plasting and then regrinding. You are regriding them, right?
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Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
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08-06-2003, 06:46 PM
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Plastic media blast and then regrind
Ben 77 911 3.0 75 914-6 2.7 |
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08-06-2003, 07:03 PM
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Thanx for all hints. Yes, valves are going to be re-seated with ordinary two-grain abrasive paste (it's not CNC 3-angle job).
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08-07-2003, 02:07 AM
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If you are just lapping them in(not reccomended) make sure you use a non abrasive media such as plastic or walnut shells
Ben 77 911 3.0 75 914-6 2.7 |
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08-07-2003, 01:27 PM
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1979 Porsche 930 3.4
