10v Motor Eats Alum Shavings for Breakfast... How to prevent it

[superba]

Hi All,

Apparently, I awakened a sleeping dragon when I suggested glass bead
blasting of parts that have corrosion, carbon buildup, burrs, and the like.
I improperly assumed that the readers would know that this should be done on
2 ported items where the debris can be blown away with compressed air.
Common sense works wonders in these matters.

As for the turbo builders voiding their guarantee if a part isn't bead
blasted;  I have chapter and verse.  The parts involved are the inlet and
outlet oil lines to a turbo if one wants to reuse rather than replace the
oil lines, not the turbo itself.  Of course, one could pay about $200 for
refurbed oil lines or maybe $25 for bead blasting of the flange and pipes on
each end.  In a turbo rebuild, bead blasting is used to clean and polish the
turbo body itself(when it's "empty"; without the impeller and compressor
vanes, shaft, and bearings).  Talk to some turbo rebuilders, if there any
left.

Cheers!

Jim Jordan

>  -----Original Message-----
>  From: John Larson [mailto:j.d.larson at verizon.net]
>  Sent: Thursday, October 09, 2003 9:03 AM
>  To: superba at comcast.net; mailto:quattro at audifans.com
>  Subject: Re:10v Motor Eats Alum Shavings for Breakfast... How to prevent
>  it
>
>
>  "If you do that again, take it to a machine shop and have it blasted with
>  beads.  That will clean and sort of polish the interior.  Turbo
>  rebuilders
>  insist on having oil hoses bead blasted or their guarantee is void."
>
>  What?!!!
>
>  Bead blasting of ANY internal engine parts is a SERIOUS no-no.
>  I've yet to
>  encounter a machine shop at the professional level that will do it.  Most
>  other "soft" media are ok, but not sand, and DEFINITELY not glass beads.
>  Glass, especially, sticks in cracks, crevices, and threads, and
>  comes out at
>  the most inopportune times.  I've seen ruined threads, ruined
>  bearings, and
>  permanently plugged oil passages.  I can't imagine a turbo rebuilder
>  requiring such a guaranteed reason for failure.  John
>