[Vwdiesel] boring vw diesel

[LBaird119 at aol.com]

In a message dated 1/31/2004 6:45:35 AM Pacific Standard Time, 
dieseljim at suscom.net writes:

> I have York Mack bore several engines for me.I give them the pistons and
> they set the ring clearance up at .010.They use 500 grit stones to finish
> the bore.Rougher stones leave to deep scratches which soon wear out and your
> bore is soon to big

  .010???  If those are OEM pistons then that's 4X the wear limit!  I had a 
bad experience with too fine of hone.  My Jetta used oil pretty severly and 
smoked badly at startup after about 10K miles and the addition of a new 
oil pump.  New rings fixed it for another 10K (on a NEW rebuild!)  Turned 
out they were honed TOO FINE.  Not enough grove to hold oil to lubricate 
the rings.  In just over 10K miles I had .054 end gap on the top rings!  Not 
sure what grit of hone Total Seal calls for but I have the RA roughness and 
Sunnen numbers written down somewhere.  Should be about as rough as 
the little slidey thing on a 3 1/2 " floppy disk (the brushed aluminum ones).
  I've torn down many engines with ove 100K on them, with much more 
coarse than #500 hone marks still visible.
     Loren