[Vwdiesel] 3M bristle disc use? Re: prepping block for head gasket tips

brian gochnauer brian at gochnauer.net
Mon Jan 19 16:16:15 PST 2009


Have you (or anyone) tried the radial disc, looks like it would have more
flexible uses like oil pan gaskets.?
Kinda pricey, how long do they last ?

On 1/19/09, Will Taygan <william at taygan.com> wrote:
> On those bristle discs, how much pressure do you use?  I'm also assuming
> you use it so the bristles are all touching the block at the same time,
> and not on an edge.
> P.S. I've got an angle grinder, a dremel, and a drill, but no die
> grinder.  Probably have to use the drill, hmmm...
> Thanks,
> Will.
> On Sun, 2009-01-18 at 00:01 -0600, James Hansen wrote:
> > Will, I use these on every gasket surface, especially when using MLM or
> > steel shim head gaskets on my race car motors.
> >
> > http://www.sjdiscounttools.com/3m7528.html
> >
> > I just googled 3M roloc bristle disc, so you could see  a picture, no
> > recommendation whatsoever for these guys, but the price seems good.
> > You'll prep maybe 5 blocks with one disc, so try to find one from a
> > supplier such as acklands that breaks up cases and sells them
> individually.
> > They are EXTREMELY good surface prep, use with a die grinder (best is a
> > 90 degree one) and a roloc backing pad to match.
> > You want the white (v.fine) pad, it makes a very good gasket mating
> > surface for most aanything, is very slow to cut on steel, mostly
> > polishes, and is designed to surface prep aluminum, so it cuts very slow
> > on steel.
> >
> > Turn the crank so all the pistons are down a bit, stuff an oil saturated
> > rag in each hole to catch cooties, and keep them from going past the
> > piston crown to the top ring.  After polishing, clean clean clean.
> > run a tap down the head bolt holes, vacuum the holes out, blow them out,
> > such them out with a soda straw, ANYTHING to get them completely
> > perfectly clean or you can crack the block when the bolt encounters some
> > foreign material.  Ounce of prevention saves a pound of "Oh shit!"
> > -james
> -snip-
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