Another item on bolts especially in aluminum - DON'T USE GRAPHITE.
Graphite is highly detremental to aluminum. A real no no is to mark on a
airplane aluminum part with a pencil. It will promote cracks in the
surface of sheetmetal etc.
The anti seize compounds are available in different compositions to match
the metal used on. I have some stainless filled and copper filled types
I have had for years. Copper and aluminum also don't go together.
There is a chart on the compatability factors (electrolysis??) somewhere.
When joining electrical connections (copper to aluminum or galvanized
material special coatings are required on the connectors etc).
I'll be quite now - too many words
Joe Worsley
Hu Stanley wrote:
>
> Another angle on this is the fact that you have an aluminum head, and a
> cast iron block. Dissimilar metals in contact will set up galvanic
> corrosion. The bolts will certainly be affected by this.
>
> ...Your comment on marine repairs brought this to mind. Is there such a
> thing as a long lasting, hi temperature, zinc chromate lubricant? This
> could help -- but only AFTER you finally got the blasted bolts apart.
>
> ...Someone's title for this thread was "TR7 Studs". My question is,
> aren't we all? :)
>
> - Hu -
>
> =====================
>
> On Wed, 26 Feb 1997, Joe Worsley wrote:
>
> > After watching the list for awhile and reviewing old memories of similar
> > tribunals on removing bolts etc. I thought I would throw my $.03 worth
> > in. I learned long ago from living around salt water and having a number
> > of boats that you NEVER put anything back together that might corrode
> > or rust in place, that I might want to take apart again unless I coat it
> > with antiseize/corrosion compound (Locktite coated item excepted). I
> > also always lube bolts that fit into aluminum threads (works better last
> > longer).
> >
> > I have drilled too many bolts out and cut too many nuts with a chisel to
> > ever forget to coat them before reassembly. You can even get a high temp
> > type to put on exaust mainfold bolts.
> >
> > You local parts house sells mumerous brands and most outboard dealers
> > have a excellent type put out by OMC or Mercury.
> >
> > Joe Worsley
> > 80 TR8 DHC
> > Tupelo, MS
> >
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