[Vwdiesel] three questions...

[LBaird119 at aol.com]

In a message dated 1/30/2004 8:52:17 AM Pacific Standard Time, iscass at shaw.ca 
writes:

> so..if i can afford it ,a bore and new pistons will possibly add to
> the life over just
> the re-ringing?
> do i always need new pistons if block is board?
> 

  It will almost ALWAYS add to the life since you're starting with a new 
bore, less slop, zero wear, etc.  The catch is to MAKE DARN SURE 
the machinist know's what's what when boring these engines!!!!!!!!!
  Mine wanted to bore for .0018 clearance.  Specs call for .001 and 
the wear LIMIT is called out at .0024 inch.  He was going to give me a 
FRESH bore that was more than HALF GONE already!  The reason 
was because that's what some other shop in town wanted.  (No chance 
of seizing a piston that way I suppose.)  I had to show him in the Bently 
manual the proper clearance.  He wouldn't believe it could possibly be 
tolerated that tight.  ALWAYS ask what tolerences they are going to 
bore to an demand no more than .0012".
  Yes you always need new pistons to bore a block.  I suppose you could 
scrounge up some used, oversize ones but that's kind of defeating the 
purpose.  In fact you need the pistons BEFORE you take the block in to 
be bored.  They mic the pistons and then bore and hone to size FROM 
your piston's measurement.  :)
     Loren