Mark the distributor so that you know where the rotor
is pointing when you re-install it. Remove the distributor,
pry the old seal off, install a new seal (I highly recommend
that you go to a dealer and get what they now term an
oil pump drive o-ring, it's tan in color and will last much
longer then the old black ones) and if you want some extra
insurance, purchase a small block chevy distributor gasket
and install that on the distributor shaft "before" you install
the new o-ring. With the new design o-ring, I don't think
the gasket is necessary anymore. Re-install the dist,
and check your timing.
You can get the o-ring over the drive gear, it's quite flexible (the
I don't know what the aftermarket guys are selling, which is why I
mentioned the dealer. I work at a dealership, and we have had the
new updated o-ring for a few years now. Plus, even at the dealership,
the o-ring is only a few dollars.
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