VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: Dasherhead on June 03, 2009, 06:22:30 am
-
In Vince's great writeup on rebuilding injectors he places sandpaper on glass and laps surfaces. Is that water on top of the sandpaper? Help me out here - I want to get this one right! BTW - this is a great site for learning! :)
-
Welcome to the site!
It's a generic light oil... probably some 5W30 from my gasser days. ;)
As the instructions say... the "proper" tool is a precision microtome or a very fine green lapping block. Sandpaper is kinda cheating, so the trick is to do as little as needed after having a close look at how out-of-whack the surfaces are.
-
I've had good luck using those peel and stick sanding discs. They stick quite nicely to a sheet of glass.
About the only thing I do differently than Vince is the motion used for lapping. I use a figure 8 motion and rotate the part 90° every couple seconds. This method seems to virtually eliminate any chance of wearing the part unevenly. :)
-
I've had good luck using those peel and stick sanding discs. They stick quite nicely to a sheet of glass.
About the only thing I do differently than Vince is the motion used for lapping. I use a figure 8 motion and rotate the part 90° every couple seconds. This method seems to virtually eliminate any chance of wearing the part unevenly. :)
The only thing there though is that can you get them in a 400-600 grit or finer and are they the wet or dry style and hold up to the oil very good?
-
i ALWAYS use oil with wet dry for fine sanding like injector internals.
ALWAYS...
wet dry i would say is re-usable. The grit obviously goes down after exended use but used correctly and carefully it can last a very long time. escpecially tapped to a piece of glass.