01-04-2010, 08:29 AM #1
Looking for some info on lapping valves
I am suprised there is no thread on how to lap the valves. I saw a few people mention it, but nothing of greater substance.
Anyone have any info on how to lap the valves?
01-04-2010, 09:40 AM #2
Let the machine shop deal with that... while they have it
01-04-2010, 09:44 AM #3
01-04-2010, 09:53 AM #4
It is a very easy task.
Get some clover compound.(Lapping Compound)
They sell a tool its a small suction cup that you spin between your palms.
Or you can use a cordless drill and a rubber hose.
Put some compound on the valve seat area and spin the valve while applying light pressure. Continue till the valve sealing surface is dull and even all the way around the seal.
Last edited by beerdart; 01-04-2010 at 11:58 AM. Reason: added pic
01-04-2010, 10:01 AM #5
I agreee with BD. I would not pay a machine shop to do it...You can actually feel and hear the valve surface smoothing out when doing it by hand.
01-04-2010, 10:03 AM #6
Very good info. beerdart and good jod man, this is the correct form of make this job.
01-04-2010, 10:05 AM #7
01-04-2010, 10:06 AM #8
+1 on beerdart. Its easy as pie just need some elbow grease.
I wouldnt personaly recomend using a drill to do it I was advised against it as its easer to take more material than is neccersary.
It all depends how badly pitted the valves and seats are as to how much work it will take.
I also did mine up the otherway to the photos that have been posted, I put the suction cup onto the face of the valve so I was pushing down on the valve instead of pulling up on it to pull the valve into the seat.
Take your time its cheap and worth doing.
01-04-2010, 11:57 AM #9
- Join Date
- Aug 2009
- Discovery Bay, CA
i used to work at a machine shop that did mainly heads so i would take it to one but i guess that makes me biased. I don't know if its obvious to all or not but it wasn't said so i will.... make sure you keep the valves numbered or in order some how as to make sure they go back in the same hole you lapped them with.
also that blue dye (forget what its called) makes it easy to see when the valve has started to seat completely with the head
01-04-2010, 11:59 AM #10
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