|
|
|
|
|||||
|
||||||
(no email)
Date: Thu Jun 01 2006 - 08:34:00 EDT
This is a somewhat long information message and you should probably skip it if
you do not have a BW transmission.
I recently had to replace the rear oil seal on my BW Model 71C transmission.
While it is possible to do this with the transmission installed in the boat,
usually space and working conditions mandate removing the rear of the
transmission and taking it to a shop. The final nut on the rear of the
transmission is installed with tremendous torque and it cannot be removed
without an impact wrench. I am very glad I chose to do this because of the
learning experience that resulted.
>From a previous post on TWL, I learned about Bill Rice, at Transmarine Inc.,
in Deland, FL (www.boatgears.net), tel 386-738-0010; which is where I took my
transmission. He passed on some information that is worth sharing.
This transmission is no longer being manufactured, and you cannot buy the
geared after housing, should you have to as a result of tearing up the gears.
The nut holding the drive gear on the output shaft has a tendency to come off
with use as a result of vibration. When this happens, the nut drops off and
falls onto the geared casing and then tears up the gears.
Nearly 50 percent of the failures of this transmission were caused by this
event. The solution is to remove the original nut on the output shaft (if you
ever take apart the transmission and can get to it) and to replace it with a
castle nut and spacer, which is held in place with a cotter pin and can't come
off accidentally. You have to drill the shaft carefully, making sure no
shavings fall into the transmission.
According to Mr. Rice, BW had hundreds of law suits from this faulty design
and ended up selling off the transmission business to Velvet Drive in order to
avoid bankruptcy. (I haven't checked this out, so I can't confirm whether or
not it is true).
The salient points are this:
Take good care of your BW transmission. If it breaks, you will probably have
to replace it with a different transmission with all its attendant problems of
changing engine mounts, etc. Stay away from rebuilts on the net. He has seen
too many of them in his shop.
If it is ever apart, make the modification that can prevent this damage.
Use ATF fluid in your transmission, even though the Lehman manual says the 30W
oil is equally acceptable. The ATF runs cooler.
He suggests changing the transmission fluid every time you change engine oil,
e.g., about 200 operating hours. (Boy, is that a PIA!)
If you are having a persistent oil leak problem, even though you have replaced
the oil seal, it is probably due to corrosion wear on the bell housing. A SS
shim kit is sold to fix this problem, but they are expensive.
Rice's shop had all kinds of transmissions in it for repairs - Twin Disc,
Hurth, ZF, etc. Other transmissions have common failure points as well, but
this particular one on the BW was the result of corporate negligence, so he
says.
I hope I haven't bored you with info overload but his message is clear: take
good care of your transmission and service it more often than the manufacturer
recommends.
Martin Veiner
Unlimited Internet Access with 1GB of Email Storage.
Visit http://www.juno.com/value to sign up today!
_______________________________________________
http://lists.samurai.com/mailman/listinfo/trawlers-and-trawlering
To unsubscribe send email to
with the word
UNSUBSCRIBE and nothing else in the subject or body of the message.
Trawlers & Trawlering and T&T are trademarks of Water World
Productions. Unauthorized use is prohibited.
|