[Vwdiesel] bolt reuse
swright at zuiko.sls.bc.ca
Fri Apr 8 21:37:02 EDT 2005
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.
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...
'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
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