Re: Valve grinding tools
Posted by JWL On 2014/10/29 10:37:44
Quote:
Owen_Dyneto wrote:
Lapping is not recommended if both the seats and valves have been machine-refinished - this provides a more precise and smoother surface than you get with compound and hand lapping.
You could do a check however to make sure they seat well; a series of radial lines with a soft pencil across the valve face and then rotate the valve back a forth perhaps 1/4 turn in each direction under thumb pressure - then remove and check that all the lines are evenly broken.
O_D, I think we are in agreement on this. My comments would have been better stated if I had said that a way to check the contact of the valve with its seat would be to use a light coating of fine lapping compound and briefly lap the valve to its seat and then check to make sure there is contact on both faces and the contacts are in the right locations. Your suggestion to use a series of lines drawn by a lead pencil will do the same thing. Machinist bluing will do the same thing too. It is important to do a final check of the valve to its seat after regrinding.
(o{}o)
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