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(no email)
Date: Sat Apr 12 2008 - 04:10:34 EDT
The Velvet Drive rear seal can be replaced while the boat is in the water if
you have sufficient clearance to uncouple the shaft and slide it back 10" to
12".
This is one of those situations where a twin screw boat has an advantage, as
you can usually slide the shafts back and the props do not encounter a rudder
as they do with a single screw drive.
Once you unbolt the coupling, you need to loosen the shaft stuffing box, so
that you can slide the shaft back. I had to pry them apart and actually use a
jack to gently (!) push the shaft back. I always prefer a jack to a hammer.
Hammering on that shaft might only increase shaft vibration, which may have
been the cause of the seal leaking in the first place.
After that, you only have to remove the reverse gear housing, not the whole
transmission. I do not remember, but I think the reverse gear is held on with
about 6 bolts.
Remove the the reverse gear and take it to a shop which has the expertise to
measure the critical tolerances to determine the seal size. You may also want
to change the prop nut while you have the gear off, as this nut coming undone
has been the cause of many premature transmission failures. The actual removal
of the reverse gear only takes about 45 minutes once you figure out what you
are doing.
Suggest you buy a bolt about 1.5" longer than the ones that bolt the reverse
gear to the transmission housing. Cut off the head (just one bolt) and use it
as a pilot shaft when you are ready to re-attach the reverse gear. This
headless bolt will save you hours of frustration and probably save some
fingers as well. Thanks Phil Rosch for sharing this tip with me on TL two
years ago!
Good luck, Martin Veiner
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