Volvo Penta TAMD63L, Instruction Book

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31
Propeller shaft brake
Under certain operating conditions, the propeller may
make the propeller shaft rotate when the engine is
stopped. This rotation may damage the reverse gear
since its oil pump, which is driven by the integral
shaft, stops when the engine stops.
The propeller shaft can be permitted to rotate with
the engine stopped for up to 6–8 hours. After this
time the engine must be started for at least 5 min-
utes to ensure the reverse gear is lubricated and
cooled.
If the shaft is likely to rotate more quickly than during
normal operation, e.g. during sailing, a temperature
gauge should be fitted which monitors the tempera-
ture of the oil.
The max. permitted temperatures are 110°C (230°F)
for Twin Disc and 95°C (203°F) for MPM reverse
gears.
If the above conditions cannot be met a brake must
be installed. A temporary solution is to lock the pro-
peller carrier mechanically instead.
Other Twin Disc – Engagement
1. Stop engine and remove the key from the key
switch.
2. Note to which solenoid valve (P or S) the wiring
marked “Primary” is connected. Detach the con-
nector from both solenoids.
3. Remove the solenoid and the valve body (V) on
the valve where the “Primary” cable was in-
stalled.
4. Unscrew plug (A) from its holder on the reverse
gear. Install the plug in the valve body hole as il-
lustrated.
Tightening torque: Max. 27 Nm (2.7 kpm = 19.9
lbf.ft).
WARNING! After engagement the reverse
gear is locked for use Ahead and cannot
be disengaged with the control.
Other Twin Disc: Manual engagement of
reverse gear (safety system)
A. Plug*
P. Solenoid valve (Primary). Used normally for Ahead (forward)
movement
S. Solenoid valve (Secondary). Used normally for Astern (back-
ward) movement
V. Valve body
* Tightening torque: Max. 27 Nm (2.7 kpm = 19.9 lbf.ft).
Back-up power supply
If the battery voltage should for any reason drop be-
low normal during operation (generator not charging
or discharged batteries) the engine will stop.
A back-up system is required to start the engine. On
pages 79, 81, 85 and 87 can be found a suggestion
for installing a back-up starting system for 12V and
24V respectively.
The back-up system is activated by switching in us-
ing the main switch (“2
B
” in the wiring diagram) which
brings the emergency/extra batteries on line with the
starter batteries.
NOTE! The back-up system batteries must be in a
charging circuit from the generator on the engine, for
example, although this is not included in the engine
wiring diagrams.
Note. This system is not factory installed from Volvo
Penta, it must be installed during the engine installa-
tion.
Check in the Instruction Book for the boat if there
is some other type of back-up system supplied.
NOTE! If there is a short-circuit in the electrical sys-
tem, one or more of the semi-automatic fuses will trip
and the engine will stop.* The fault must be corrected
before the engine can be re-started.
* Note. Refer to page 69 for resetting the fuses.
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