With 4.7 aluminum heads, cold is the only way to go. The warmer they are the easier it is to strip threads, and
being an air cooled vw owner of several vehicles/decades I can state that you don't want to dink around with
stripped threads in aluminum heads.
MALDBNSF@aol.com wrote:
> Coming from the old school;} I was told to change the plugs on a BRRRrrrr cold block. It's always worked for me.
>
> Don Mallett
> Geocities.com/maldbnsf
>
> > PS. wait a second on the "do it while it's warm" I have always
> > done it while it's cool. Reason is... the heat would cause the
> > metals to expand, making a tighter seal, so if it's cool, it
> > should be contracted, making it easier? Correct me if I'm wrong...
>
> Well, I can see two schools of thought on this, both of which seem logical.
>
> In one scenario, the head would expand into open spaces, meaning the size of
> the threaded opening would shrink, making the plug more difficult to get
> out.
>
> However, if the metal expands relationally (meaning the entire piece
> basically scales up to a larger size), the hole would become bigger as well.
>
> If someone hadn't stolen my digital caliper, I could measure a hole in a
> piece of metal both cool and hot to see what actually happens, but I'm sure
> someone here already knows. Anyone?
>
> >>
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