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1. 60K replacement intervals for serpentine belt. I use the tool from
www.ipdusa.com to remove it. When putting a new one back on a tip
is to pull the tensioner back just a bit manually. It has a pin
that locks it "open" but if you manully pull it a bit more you get
just a little more slack that makes it easier to put back on. (This
makes more sense when you actually do it.)
2. I don't think there is any way to service (grease) the pully.
It should be fine for the first change. Both were on my 850 and
S70 when I changed the timing belt.
3. Water pump should be visually inspected for leaks. If there are
no leaks you can leave it alone. Should be fine til the second
timing belt change (when I would give it more scrutiny).
4. I don't think they can be inter-changed. I'd leave it as it came
from the factory since a failure destroys large parts of the engine.
Also, the mechanical one has a longer service life and you seem to
be changing the belt early so the longer life would not mean much
with your conservative approach.
The cover for the timing belt comes off with one bolt in about a
minute. You can pull it off and inspect the belt for wear. You
can also see the tensioner and water pump wit the cover off. You might
have a look and if it looks fine schedule the service more towards
60K miles. Note that some say replace at 5 year intervals and you
are probably at that point, too (so a quick inspection might not be
a bad idea now). Use a flashlight to make sure you get the timing
cover back on correctly. Getting it back is harder then removing it.
You basically don't want it rubbing any moving parts.
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