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Discussion Forum

Hand lapping valves-any pointers?

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Steve (WI)

05-13-2002 17:39:25

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Just looking for some input because I have never done it before. The seats and valves are a little carbonized but look good and should clean up well. I was told hand lapping should be all it needs. I was also told the intakes are set different from the exhausts. Any help or a walk thru?


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05-17-2002 05:16:07

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 Re: Hand lapping valves-any pointers? in reply to Steve (WI), 05-13-2002 17:39:25  
I take the valves out and clean them with the wire brush the lap the in with a little grinding compound that you can fet at your auto parts store or you can mix up a paste with the dust from your bench grinder. I just use my little cordless drill to spin the valves, a little forward and a little back. clean up things real good when you get done.

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Dave Grubb

05-14-2002 06:22:59

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 Re: Hand lapping valves-any pointers? in reply to Steve (WI), 05-13-2002 17:39:25  
The intake and exhaust valves are both ground to a 45 degree angle. The seat width should be 1/16" and centered on the valve face. The seat width can be narrowed by grinding a 30 degree angle on the cylinder side and a 60 degree angle on the manifold side.

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Steve in N.J.

05-13-2002 18:28:46

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 Re: Hand lapping valves-any pointers? in reply to Steve (WI), 05-13-2002 17:39:25  
Valves will lap in okay providing the valves aren't to loose in the guides, and the valve seats aren't pitted to where the valve won't seat correctly. If the guides are pretty tight where the valve doesn't move much they should lap in okay. When lapping in the valves, make sure your new surface is consistant all the way around the seat. A medium duty compound should work fine for a non-pitted seat. If the valves are real loose in the guides, rule of thumb is renew the guides and regrind the seats after "facing" the valves.. You mentioned carbon, if there's excessive carbon around in the combustion chamber, remove it with a wire brush on a drill. Carbon causes "hot spots" which causes detonation in the cylinder under load. Hope this helps...
Steve B.

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