I recently removed, cleaned and regreased all 4 of my CV joints and
installed new boots on my 87 Vanagon.  I need to do the same work on my 90
Jetta TD with 395,000 KM on the clock.  Much like the van there is nothing
wrong with the CV's right now, boots are fine and there is nothing
indicating there is anything worn.  I will be unable to do this work for
quite some time.  In the meantime i was hoping to get at least some fresh
grease in there without removing/replacing any of  the clamps.  I have a
"srynge" type tool that fits at the end of a grease gun that would enable me
to puncture the boot and get fresh grease in there.  I would make one
puncture close the the bearing races and pump in several ounces(?),  then
would work the grease into the neighbouring races by squeezing the rubber
boot.  Once completed i would seal the hole (approx. the size of a large
sewing needle) with a dab of silicone seal.  As far as i can remember the
inner CV's have never been opened, the two outer's have had boots replaced
and repacked a long time ago.  What are your thoughts?  Has anybody tried
this before?      Thank you for your thoughts.
Claudio Cella