What is meant by Left Hand (LH) and Right Hand (RH) rotation?
An engine that is turning counter-clockwise from the rear, the top of the flywheel turns to
the left, is called a Left Hand engine. It is also called automobile or standard rotation.
An engine that turns clockwise from the rear, the top of the flywheel turns to the right, is
called a Right Hand (RH) engine. This is also called marine rotation or counter rotation.
My transmission fluid smells burnt or is discolored. Should I have the transmission replaced?
We have found that in every case where the fluid smells burnt or is at all discolored the
clutch plates have slipped and are worn or even warped out of shape. There is no way short
of replacing these plates or replacing the whole transmission, that this condition does not
lead to total clutch failure in a short time. The clutch pack will continue to slip and generate
heat leading in the end to the plates welding themselves together. Also, pieces may be lost
off the plates that damage the other parts of the transmission.
My transmission fluid looks like milkshake, what happened?
Water leaking into the transmission via the cooler makes it look like either strawberry
milkshake if ATF is used, or vanilla milkshake if oil is used. Just draining the transmission
and refilling it will not remove all the water no matter how many times you do it! Some water will always remain in the clutch cylinders and low spots in the case. As quickly
as possible have the transmission disassembled and cleaned ASAP. If it cannot be serviced
quickly then drain the old fluid and refill as full as possible with ATF, motor oil,
kerosene, diesel fuel or paint thinner to prevent rust till service can be obtained.
Why can't I use an automatic car transmission in my boat?
All the push developed by the propeller is applied to the output bearing of the marine
transmission. It is designed to handle this force. A car or truck transmission is not designed
to have any push applied to the output bearing. Even if you install a load bearing between
the car transmission and the prop shaft I've been told that an automatic transmission will go
up through the gears then start to shift back and forth between the gears. If using auto
transmissions was a viable option then I'm sure boat builders would have gone to them long
ago as they were cheaper than boat transmissions!
How about using a stick shift auto transmission?
Consider the linkage required both for the clutch and the shift. Such an arrangement would be difficult on anything larger than a ski boat.
Why is the replacement of the fluid cooler required by the warranty?
Every time the engine is stopped the cooler flow stops and any particles in the fluid settle
out. Some particles clump together and are not picked up when the fluid starts to move again. Because of baffles built into almost all fluid coolers total clean out is almost
impossible. Leftover particles in the cooler can break loose and go through the transmission.
Also, over time corrosion and scale can build up on the inside of the cooler and reduce heat transfer.
FAQ's ABOUT VELVET DRIVE TRANSMISSIONS
Is it true that you can run Borg-Warner/Velvet Drive marine transmissions with either LH
or RH engines?
Some models will operate with either LH or RH engines if the pump is set to match the
engine rotation. Some models are made to only operate with LH engines. See the Rotation Guide page for a list of models that will and will not work with both rotations.
How can I make my Velvet Drive transmission reverse its output rotation in forward?
You can't on models 71C, 72C, 1017, 1018, 1013, 1014, 1004 & 1005. The reason is that,
except for certain other models specifically designed to reverse the output rotation in forward,
the reverse gear is not made to handle speed higher than idle RPM. Reversal or non-reversal
of rotation between input and output is due to the internal layout of the gear reduction
section and it is not changeable without changing the reverse pinion carrier and/or all the
reduction gearing. This option is usually more expensive than replacing the transmission.
See the Rotation Guide page or call us for specific rotation information.
I have a sailboat, will it hurt my Velvet Drive transmission to free-wheel when I am under sail?
Free-wheeling is not recommended. All Velvet Drive / Borg-Warner Marine transmissions
require the engine to be running to deliver lubrication to the various bearing and gears.