down when the engine is stopped. This drop lets the
(approximately 500 rpm) with the clutch disengaged.
ridge locate between the pressure plates. The drive
The speed will he sufficient to move the segments out
ring cannot he properly adjusted to the recommended
to operating position.
engaging pressure with the disc so positioned. The
2. Check the pounds pressure required to engage the
condition can result in excessive slippage and a need
clutch. The engagement pressure should be the same
for early clutch facing replacement.
as that following the adjustment. If the clutch engages
at a lower pressure, the adjustment was probably made
Make a final clutch adjustment check with the engine
against the unworn portion of the facing.
running, to make sure the adjustment was not made
against the ridge. The procedure is outlined below:
3. Stop the engine and readjust the clutch, making sure
all disc segments are properly positioned. Install the
1. Start the engine and operate it at idling speed
inspection hole cover.
TORQMATIC MARINE GEAR
The Torqmatic marine gear is used on 6V and 8V
110-150 psi (758-1034 kPa) in reverse. The average
single engine marine units and tandem twin marine
operating oil temperature is 200° F (93° C) in forward
units. The marine gear consists of a reverse gear
and a maximum of 250° F (121° C) in reverse.
section and a reduction gear section. Each marine gear
is available in several gear ratios.
A strainer is used between the oil sump and the pump
to remove harmful solids. The oil passes from the
pump through a cooler to the control valve. From the
The oil for operating the hydraulic clutches and for
control valve, the oil operates the forward or reverse
lubricating the reverse gear is contained in the reverse
clutch pistons and sprays oil into the reduction gear
gear sump and is circulated throughout the system by
housing to lubricate the gear.
a hydraulic oil pump mounted on the flywheel housing
and driven from the blower drive shaft through a
The constant flow control valve, incorporated with a
pressure relief valve, controls the amount of oil
pumped through the hydraulic system and is sensitive
The oil pressure ranges for the marine gear at forward
only to engine speed and operates independently of
operating speed are 130-155 psi (896-1068 kPa) and
the pressure relief valve section which controls the
pressure within the complete hydraulic system.
When the engine is in operation, the moving parts of
the marine reverse gear are pressure lubricated while
the reduction gear assembly is splash lubricated.
Shifting from forward to reverse drive through neutral
may he made at any speed; however, it is advisable to
shift at low engine speeds. For longest clutch life,
reduce the engine speed to idle, make the shift and
then increase the engine speed.
The marine gear selector control valve assembly on the
tandem twin marine engine unit is provided with
several levers (Fig. 17). The master control lever
engages both marine gears in forward or reverse
simultaneously. The smaller levers, one for each
engine, operate the shut-off control valves for
controlling the flow of oil to each individual engine
marine gear. These levers are normally set in a vertical
position ("on" position). To shutdown one engine for
service work or to conserve on power in a light load
situation, place the master control lever in the neutral
position and then turn the shut-off lever for that
engine to the "off" position (90 degrees toward the
Fig. 17 - Lever Arrangement on Tandem Twin
engine). With the shut-off lever in the "off' position,
Engine Marine Gear Selector Valve
the marine gear for that engine is locked out of