Valve lapping

vanagonvw · Post by **vanagonvw** » Sat Feb 07, 2009 7:38 pm

I have visited the Checker, Autozone, and Napa stores and none of them seem to have the 'blue dye' that I need to check the surface of the valve against the seat.

Can anyone tell me where I might find this stuff, and even better, is there a common name for it, so I can ask for it like I know what I am doing.

Thanks,

John

Westy78 · Post by **Westy78** » Sat Feb 07, 2009 8:13 pm

If you can't find the dye (Dykem machining dye is what you can ask for) a permanent marker can be used also.

Whip618 · Post by **Whip618** » Sat Feb 07, 2009 9:03 pm

Prussian blue is what we have always used in the tool and die industry as a non drying surface coating to check flatness and contact between two surfaces and it wipes off easily after use with just a dry rag. Dykem is a quick drying layout fluid in red or blue and must removed with a solvent like laquer thinner or alcohol. Prussian blue comes in small tube, has the consistancy of grease and is available through most precision tool suppliers.

Phil

Post by **Amskeptic** » Sat Feb 07, 2009 10:02 pm

I have used Prussian Blue or Prang watercolors, since I seem to be using Prang watercolors these days. . . blue.
Colin

vdubyah73 · Post by **vdubyah73** » Sun Feb 08, 2009 5:28 am

Permanent marker or just plain bearing grease.

Itinerant Air-Cooled

Itinerant Air-Cooled

Valve lapping

Valve lapping