[Vwdiesel] bolt reuse

[Shawn Wright]

On 8 Apr 2005 at 21:25, LBaird119 at aol.com <LBaird119 at aol.com> wrote:

> The shop that
> rebuilt it specifically waited until he had the new .020 over pistons before he
> did the bore and hone on the block. He said that he had to match the new pistons
> to the block. So that tells me he has some idea on how to rebuild this engine
> and not just bore and hone it to book spec's and expect the new pistons to fit. 
> Since he was so thorough I'm really curious as to what is wrong with the rings. 
> 
> 
>   Standard procedure does not mean thourough or knowlegable on a 
> particular engine.  I've NEVER had a shop willing to bore an engine 
> without piston in hand FIRST.  Regardless of the fuel it burns.  Most 
> don't even check over the batch for consistency but some do and 
> then decide on the bore dia.
>   Blowby is coming past the rings or in a smaller degree past worn 
> valve stems or guides.  If your engine was honed too finely then it's 
> likely to wear the rings quickly and have blowby before they have a 
> chance to seat well even.  The tendancy anymore is to hone to a 
> fine finish instead of coarse and that just doesn't seem to work on 
> these engines.

Loren,
How do define a fine finish? I used a 180 grit flexhone for about 45 seconds per 
bore. I found it near impossible to achieve 45 degree crosshatch at the indicated 
speed of 600-1200 rpm, so ended up finishing each bore at a much slower speed 
trying get that 45 deg angle. I just hope this works...

Shawn Wright
http://zuiko.sls.bc.ca/~swright
'85 Jetta D 
'88 Westy 2.1L, soon to be 1.6TD 5 speed
 (see progress at http://members.shaw.ca/vwdiesels)
'82 Diesel Westy