Borg Warner Velvet Drive Transmission
Table of Contents
    I     General Information.... . . . . . . . . .
   II     Launch Maintenance ................... ...
  III     Operation . . . . . . . . . . . . . . . . 
   IV     Winter Storage .................
    V     Troubleshooting . . . . . . . . . . . . .
   VI     Warranty. . . . . . . . . . . . . . . . .
  VII     Maintenance Record............. ............   

===== Owner's Responsibilities ===================================================

It is the owner's/ operator's responsibility to perform the necessary safety checks to ensure that all lubrication, cooling, maintenance and recommended practices are followed for safe, enjoyable operation.

Proper care and maintenance will only help ensure long service life from your Velvet Drive transmission.

==== General Information ==========================================================

1-1. Every Velvet Drive marine transmission is self-contained, having its own sump and hydraulic pump separate from the engine. The Rear driven pump affords assurance of positive lubrication.

1-2. The Velvet Drive In-Line hydraulic transmission is available in three (3) models with numerous final drive ratios suitable for inboard pleasure and work boats.

1-3. The Velvet Drive-" CR2 was designed specifically for twin screw applications. The counter rotating (CR) capability eliminates the need for opposite rotating engines.

1-4. The two (2) models of the V-Drive transmissions deliver the same horsepower ratings as the CR2. Gear or chain driven final drive will accommodate twin screw applications using same rotating engines.

1-5. The identification tag that appears on all Velvet Drive" transmissions is located on the top of the left-hand transmission mount and contains valuable information concerning the transmission. This information is as follows:

a. Model Number -- This appears below the words "Velvet Drive."
b. Ratio -- The gear ratio appears in the left-center of the identification tag.
c. Serial Number -- Appears at the right center under the model number.

16. Transfer the information on your identification tag to the Maintenance Record Chart on page 10 of this manual. Additionally. the color of the identification tag should be noted in the appropriate space and the date placed in operation.

1-7. The model number and serial number is required on all correspondence.

========== Table 1-1. General Specifications ========================================


Model        Ratios*      Fluid Capacity**    Dry Weight

                                     Qt./Liters           Lbs./Kgs.

10-04   1.21:1 thru 2.50:1    4/3.8              190/86.2

10-05   1.21:1 thru 2.50:1    4/3.8              203/92.1

10-06         1:1                     2/1.9               135/61.2

10-06   1.5:1 thru 3:1           3/2.8              185/83.9

10-13   1.58:1 thru 2.93:1    4/3.8              162/73.5

10-14   2.47:1 thru 2.93:1    4/3.8              175/79.4

10-17         1:1                     2/1.9               95/43.1

10-17   1.52:1 thru 2.91:1    3/2.8              145/65.8

10-18         1:1                     2/1.9              109/49.4




====== LAUNCH MAINTENANCE ====================================================

2-1. The following maintenance should be performed after launching your boat to ensure optimum performance and life from your Velvet Drive" transmission.

CAUTION: Vibration, gear noise, loss of rpm and premature oil seal and bearing failure can be caused by misalignment of propeller shaft coupling and transmission output coupling flange.

2-2. Propeller shaft coupling flange and transmission output flange alignment is performed after launching of your boat, as well as any time your boat strikes a heavy object or after your boat has been hoisted or pulled from the water.

CAUTION: Remove attaching hardware from transmission output flange and propeller shaft coupling flange before removing boat from water and separate flanges.

2-3.  Check the alignment of the transmission output flange and propeller shaft coupling flange using the following procedure with boat in water:
a.   Disconnect the battery.
b.   Remove attaching hardware from coupling flanges.
c.   Check clearance around coupling flanges with .003 feeler gauge and flange pilot engaged.
d.   Rotate coupling flanges together one complete revolution, stopping every 90" to check clearance with .003 feeler gauge.
e.   Alignment is satisfactory when the transmission output flange and propeller shaft coupling flange with pilot seated are within 003 inch (.076 mm) of parallel.
f.  If alignment is unsatisfactory, an adjustment is required (see paragraph 2-4).
g.   When alignment is satisfactory, tighten attaching hardware.

2-4. Propeller and Output Shaft Adjustment

CAUTION: Do not lift or pry against transmission output flange or coupling to move engine.

This adjustment is accomplished at the boat motor and transmission mounts ONLY. This procedure should be accomplished by a skilled marine mechanic.



2-5 Shift Lever Positioning
The selector control mechanism and linkage must position the shift lever on the transmission exactly in Forward (F), Neutral (N), and Reverse (R) shifting positions. A detent ball located behind the transmission shift lever must work freely to center the lever in each position. (see Figure 2-2). The selector control positions at the helm(s) must be coordinated with those of the Velvet Drive shift lever through shift mechanism adjustments. An improperly adjusted shift mechanism can cause damage to the transmission.

NOTE: When moving from Neutral Position to:
        Forward: lever always moves towards engine.
        Reverse: lever always moves away from engine.

CAUTION: Clutch failure will occur if transmission shift lever does not fully engage detent
ball positions.
The shifting mechanism and transmission shift lever should be free of dirt to ensure proper operation.

CAUTION: Do not remove detent ball.

2-6. Transmission Connections
a.   Visually check for oil leaks at hydraulic connections, worn hydraulic lines.
b.   Check for broken or loose fasteners.
c.   Replace all worn hydraulic lines, tighten all connections where an oil leak has occurred, and secure all hydraulic lines.
d.   Visually check all electrical connections for loose terminals and worn wires.
e. Repair or replace all worn or broken wires to Coast Guard specifications and tighten all loose connections.

2-7.  Transmission Bolts
a.   Check all exterior transmission bolts for tightness.
b.   Tighten all loose bolts to recommended torque specifications.
c.   Tighten all coupling bolts.

2-11. Change Transmission Oil
A seasonal transmission oil change is recommended for all pleasure boats. Work boats require transmission oil changes every 1,000 hours. Oil must be changed anytime it becomes contaminated, changes color, or becomes rancid smelling.

WARNING: Do not use gasoline or any other volatile or highly combustible liquid as a solvent.

2-9. Removing Transmission Oil (Oil Filler Cap)
a.  Place an appropriate size container near oil cooler return line.
b.  Remove oil filler cap and dipstick assembly (see Figure 2-:1).
c.  Remove oil cooler return line.
d.  Allow oil from return line to drain into container.
e.  Connect oil cooler return line and torque to 25-,15 ft.-lbs. (34-47 Nm).
F. Use a suction pump in the oil filler cap hole to remove remaining oil in the transmission
g. Remove suction pump from transmission.

2-10. Fill Transmission With Oil
The quantity of oil depends upon the model Velvet Drive"' (see Table 1-1 for capacity) angle of installation and oil cooling system capacity.

NOTE: Oil capacities in Table 1-1 are for transmission only. Additional oil will be required for oil cooling system.

CAUTION: Clean around the area of the dipstick,
   before removing. Small particles of dirt can cause damage to internal components and cause values to stick.

Check Oil Level.

The transmission should be at operating temperature (190o max.) to get an accurate oil level reading. Oil will expand when it is heated. Oil will drain back from the cooler. Expansion and drain-back can significantly affect oil level.

Warm Oil Level Check.

When the transmission is at operating temperature, place selector lever in neutral. Shut off engine. Carefully remove transmission dipstick. Immediately insert clean dipstick and read oil level.

NOTE: Oil level must be checked immediately after engine shut-down to prevent an incorrect reading. Oil drains back into transmission from the cooler and cooler lines.

Add or remove oil if necessary. Repeat the above checking procedure as required until oils at the dipstick mark.

Cold Oil Level Check.

For ease of checking the oil prior to engine startup, a cold oil level mark can be made. To find the cold oil level mark, the oil level must first be set according to the warm oil level checking procedure. Then, let the boat sit overnight. Insert clean dipstick and read oil level.

Put a mark on the dipstick at the cold oil level reading. You can use the new mark to check the oil level when cold. If oil level adjustment is needed, add oil to the new mark.

CAUTION: System related noises or vibrations can occur at low engine speeds which can cause gear rattle resulting in damage to the boat engine and/or transmission. Borg-Warner Automotive Inc. is not responsible for total system related torsional vibration of this type.

2-11   Service manuals can be obtained by contacting the nearest Velvet Drive distributor.

Dexron II, Type F, or any hydraulic fluid which meets the C-3 oil specification is recommended. Do not mix different brands or types of oil. If engine doesn't exceed 3000 RPM, a premium grade 30 weight engine oil is acceptable. 40 weight and multi-viscosity oils are not recommended.

If the transmission oil temperature has exceeded 190" F, the oil must be changed in the transmission and oil cooler system. If the transmission alarm sounds, the oil must be changed also.

Any changes or modifications to the transmission cooling system will require that the oil level be readjusted.

Any additions to the boat which will change the installation angle of the transmission at rest (such as extra fresh water tanks, fuel supply, etc.) will require an oil level adjustment.


===== OPERATION ==============================================================


3-1. Perform all pre-operation maintenance on the Velvet Drive transmission (see paragraph 2-12).

3-2. At the helm place transmission selector control in Neutral before starting engine. Shifts from any selector position to any other selector position may he made at any time below 1000 rpm and in any order. Shifts should he made at the lowest practical engine speed.

CAUTION: Shifting above 1000 rpm can severely damage
                      boat, transmission and engine.

a. Neutral: Move selector lever to the middle position. You should feel the detent center the shift lever on the transmission through the linkage to the selector lever. With the control in this position, hydraulic power is     completely interrupted and the output shaft of the transmission does not turn.
b.  Forward: Move selector lever to the forward position. You should feel the detent. The shift lever on the transmission in the forward position. The output shaft and the propeller should move the boat in a forward direction.

WARNING: If boat moves backwards with the selector control in the forward position, shut off engine (see paragraph 2 -5) or consult Your nearest Velvet Drive distributor.

NOTE: This problem can be a result of improper installation
               by the boat builder or service facility.

CAUTION: Early gear failure will occur when the transmission
                     is operated in reverse to obtain forward propulsion.

c.   Reverse: Move selector lever to the rear ward position. You should feel the detent. The shift lever on the transmission is in the reverse position. The output shaft and the propeller should move the boat in a reverse direction.

3-3. Velvet Drive Transmission Operation
a. Place selector control in the Neutral position.
b. Start engine and set throttle at idle speed and warm up transmission oil for a few minutes.
c. Be aware of any unusual noises or vibrations and investigate to determine the cause.

CAUTION: Before checking oil, shut off engine. Hot oil could cause burns.

d. Shut off engine and check transmission oil level and add oil, if required, to the full mark on the dipstick.
e.   Restart engine.

3-4. Freewheeling
  It has been determined by tests and practical experience that all Velvet Drive marine transmissions can be free-wheeled without risking damage in sailing or trolling applications. Caution should be taken to be sure that proper oil level is maintained prior to freewheeling as well as normal running. Freewheeling one propeller of a twin engine boat at trolling speeds will not cause damage to the transmission connected to the freewheeling propeller.


4-1. Storage requires special care. Before winter storage one must:
a. Disconnect battery.
b. Drain water from the transmission oil cooling system.
c. Wipe transmission free of dirt, grime and grease.
d. Touch up unpainted areas of the transmission using suitable paint.
e. Loosen attaching hardware from transmission output flange and propeller shaft coupling flange before removing boat from water and separate flanges.


Table 5-1. Velvet Drive Troubleshooting



As durable as these transmissions are, don't neglect them for long.












Oil in fly wheel housing.


Service facility.

Oil on transmission.

Loose bolts.

Tighten to specifications


Loose fittings.

Tighten, replace.


Loose dipstick.

Tighten, replace.


Loose drain plug.

Tighten, replace.



Service facility.


pin hole in cooler line





Oil around retainer.

Retainer bolts loose

Tighten to specifications.



Service facility.




Oil and water mixed

Damaged oil cooler

Service facility


Unit Submerged in bilge water

Flush n refill




High oil temperature.

Oil level low.

Add oil.


Oil level high.

Drain oil to full mark


Dirty oil cooler

Replace cooler.


Low water level.

Fill engine cooling system.



Service facility.




Shifts hard.

Selector control.

Service facility.



Adjust, replace.


Detent ball.

Clean, lubricate.



Service facility.




Slow engagement.

Selector control.

Service facility.


Low oil level

Add oil.



Adjust, replace.


Detent ball.

Clean, lubricate



Service facility.




Boat won't move.

Improper selector position.

Adjust, replace.


Low oil level.

Add oil.


Propeller missing broken.



Propeller shaft

Service facility.


Transmission malfunction.

Service facility.


Engine malfunction.

Service facility.


Charging pump reversed.

Service facility




Prop turns in Neutral

burned, warped clutch

service shop


broken shift linkage





Clattering noise

low idle



loose flex plate or flywheel

service shop


broken tooth in transmission

service shop


something in prop



loose strut





Stuck in gear


service shop





prop or shaft


Last Updated on 3/30/99