Maintenance & Technical > KX500 Original

Head nuts leaking

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KXcam22:
I have used paper on glass with good results - but it is not he optimim way.  You can't take too much off and you must fiinsh be lapping the two surfaces to each other. BDI is right though and you have to be careful.  I like the compund on glass idea!!  It sounds like you are missing is the final step of lapping the head to the cylinder. Cam.

Jopiz:
So basically this method which uses valve lapping compound  brings the operation to the 21st century from the past    decades? And this can be used to lap everything from cylinder heads to anything else which require optinum fit?
Would machining give more precise surfaces or just waste of time and money?
Sorry for stupid questions  8-)

-J

barryadam:
Abrasive sheets should be attached to the surface plate using adhesive like 3M Super 77, not tape.
Unless you are using optical quality glass, the surface flatness is not as good as you think.  Plus glass will bend/flex if not supported by a flat surface.  A calibrated surface plate is preferred, but even lower grade plates can be pretty good.  And they are usually pretty cheap for a small one, like 18" x 24" size.
Grinding compound will work both ways - on the aluminum and the grinding plate and the removal will be proportional to the material hardness.  Best to use grinding compound for that final step - lapping part to part. 

<<Would machining give more precise surfaces or just waste of time and money?>>

Machining (cutting) is for getting the surfaces to the right dimension and location (parallel, perpendicular, etc.)
Machining (grinding) is for getting a better surface finish on the machined surface.
Hand surfacing is to get a completely flat surface and to get a finer surface finish (remove all cutting marks).
Hand lapping is to match two surfaces regardless of their shape/finish.

Material removal for the above is greatest to least in the order shown.

BDI:
The glass is expenable, it has to be used on a peice of granit to keep it from flexing. In the words of my uncle, "do it how you see fit" . See ya at the hill.

cbxracer30:
I dont think your marble had a level enough surface. Maybe you should try a little yamabond on both sides of the gasket. Yamabond works wonders, it should be in everyones tool box.CBX

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