
5
Stern tunnel installation version 1.7.2 - 2015
Boat transom Boat transom
Stern tunnel
MOULD IN INSTALLATION
2b. Cut of the bolting flange on the stern-tunnel
3b. Grind off the gelcoat both inside and outside the
remaining “tube” atleast 10 cm down on the
“tube” (see FIG. 5).
4b. Offer the stern tunnel to the desired position on
the transom and mark around the tube.
5b. Cut the marked hole in the transom of the boat.
6b. Grind off the gelcoat on the transom of the boat in
an area of atleast 10 cm / 4” around the hole, both
outside and inside (see FIG. 5).
7b Offer the stern tunnel to the transom in the desired
horizontal position, then bond to the transom with
multi layers matt both inside and outside (see FIG.
6).
Take care not to reduce the internal diameter
much, as this will make it more difficult to mount
the thruster
8b Apply gelcoat or similar on all bonded areas.
9b. Install the gear leg on the stern-tunnel as de-
scribed in the installation manual for the thruster
but fit the oil feed pipe first.
Special installation points described on page 7 of
this manual.
10b. The electromotor must be sturdily supported so
that the weight-arm tension from the motor weight
are not applied only on the tunnel (see FIG. 4)
11b. Basic installation of the flexible coupling, motor
and electrical installation are described in the
thruster manuals.
Grind off the bolt flange and
the gelcoat both inside and
outside in the areas shown.
Stern thruster installation manual Version 1.6 - 2005
4
FIG. 6
Bond multiple layers both
inside and outside
FIG. 5
WARNING!
Mould in installation is ONLY
for stern GRP tunnels.
Composite stern tunnels
(Part # 90052i and 90086i )
can not be moulded in this way.
THE STERN-THRUSTER MUST BE KEPT DRY AT ALL TIMES
It is very important that you do everything possible to ensure that the thruster stays dry at
all times.
The electromotor and and solenoid system is not to be considered as waterproof, and will be dammaged if they
keep getting wet (rust and corriosion). Therefore, the thrusters installation compartment must be kept dry at all
times.
This is more difficult for a sternthruster installation than for a bowthruster installation as the sternthruster has to be
fitted in the bilge at the stern of the boat. This is generally a “wet” area that must be transformed into a dry area.
Important precautions !
- You must seal all drain holes going into the compartment of the thruster.
- The surrounding compartments and any plates or compartments above must be drained in a good way to the
bilge area in front of the thrusters installation compartment.
- If the propeller shaft or other moving parts with a high possibility for leakage comes through the bottom of the
boat in the same compartment where the thruster is placed, you must make a seperate compartment for the
thruster isolating it from these very normal and highly probable water leakages.
- The rudder shaft entrances to the boat and its surroundings must be drained so that any water coming in here
are drained to go into the compartment in front of the sternthruster compartment.
- It is also important to ensure that the sternthrusters installation compartment will not be were water runs if a self-
draining system of the boat deck fails to operate properly.
- Generally, all possible actions should be taken to ensure that water leakages from sources that are likely to have
water leakages are drained to prevent water from entering the stern-thruster compartment.
- We advice to install a self-activating bilge-pump, preferably
with an alarm system, in the stern-thruster compartment. If
you are not confident that you have been able to seal this
comparment well, this pump is absolutely necessary.
- The control-cable system for the thruster must be installed so that
atleast all junctions and connectors are kept dry at all times.
- In the Sidepower sternthruster kit, there will be included a cable,
so that electronic controlbox originally placed on the electromotor,
can be fitted away from the thruster in a higher position securing
that it will stay dry at all times, even if there are accidental leakages
into the stern-thruster compartment. Please see instructions on the
following pages of how to connect this. If you are installing a
sternthruster without the special sternthruster tunnel available from
Sidepower, this kit can be bought seperately.
The thruster
compartment
must be kept
dry at all times
Thruster
compartment
must be kept dry
at all times
Wet bilge area
Stern thruster installation manual Version 1.6 - 2005
5
The Stern Thruster must be kept dry at all times
It is very important that you do everything possible to ensure that the thruster stays dry at all times.
The electromotor and and solenoid system is not to be considered as waterproof, and will be dammaged if they
keep getting wet (rust and corriosion). Therefore, the thrusters installation compartment must be kept dry at all
times.
Thisismoredifcultforasternthrusterinstallationthanforabowthrusterinstallationasthesternthrusterhasto
bettedinthebilgeareaatthesternoftheboat.Thisisgenerallya“wet”areathatmustbetransformedintoadry
area.
Important precautions:
• You must seal all drain holes going into the compartment of the thruster.
• The surrounding compartments and any plates or compartments above must be drained in a good way to the
bilge area in front of the thrusters installation compartment.
• If the propeller shaft or other moving parts with a high possibility for leakage comes through the bottom of the
boat in the same compartment where the thruster is placed, you must make a seperate compartment for the
thruster isolating it from these very normal and most likely water leakages.
• The rudder shaft entrances to the boat and its surroundings must be drained so that any water coming in here
are drained to go into the compartment in front of the sternthruster compartment.
• It is also important to ensure that the sternthrusters installation compartment will not be were water runs if a
self-draining system of the boat deck fails to operate properly.
• Generally, all possible actions should be taken to ensure that
water leakages from sources that are likely to have water leakag-
es are drained to prevent water from entering the stern-thruster
compartment.
• Weadvicetoinstallaself-activatingbilge-pump,preferably-
withanalarmsystem,inthestern-thrustercompartment.Ifyou
arenotcondentthatyouhavebeenabletosealthiscompar-
mentwell,thispumpisabsolutelynecessary.
• The control-cable system for the thruster must be installed so
that at least all junctions and connectors are kept dry at all times.
• In the Side-Power sternthruster kit, there will be included a
cable, so the electronic controlbox originally placed on the
electromotor,canbettedawayfromthethrusterinahigher
position securing it will stay dry at all times, even if there are
accidental leakages into the stern-thruster compartment. Please
see instructions on the following pages of how to connect this.
If you are installing a sternthruster without the special stern-
thruster tunnel available from Sidepower, this kit can be bought
seperately.
THE STERN-THRUSTER MUST BE KEPT DRY AT ALL TIMES
It is very important that you do everything possible to ensure that the thruster stays dry at
all times.
The electromotor and and solenoid system is not to be considered as waterproof, and will be dammaged if they
keep getting wet (rust and corriosion). Therefore, the thrusters installation compartment must be kept dry at all
times.
This is more difficult for a sternthruster installation than for a bowthruster installation as the sternthruster has to be
fitted in the bilge at the stern of the boat. This is generally a “wet” area that must be transformed into a dry area.
Important precautions !
- You must seal all drain holes going into the compartment of the thruster.
- The surrounding compartments and any plates or compartments above must be drained in a good way to the
bilge area in front of the thrusters installation compartment.
- If the propeller shaft or other moving parts with a high possibility for leakage comes through the bottom of the
boat in the same compartment where the thruster is placed, you must make a seperate compartment for the
thruster isolating it from these very normal and highly probable water leakages.
- The rudder shaft entrances to the boat and its surroundings must be drained so that any water coming in here
are drained to go into the compartment in front of the sternthruster compartment.
- It is also important to ensure that the sternthrusters installation compartment will not be were water runs if a self-
draining system of the boat deck fails to operate properly.
- Generally, all possible actions should be taken to ensure that water leakages from sources that are likely to have
water leakages are drained to prevent water from entering the stern-thruster compartment.
- We advice to install a self-activating bilge-pump, preferably
with an alarm system, in the stern-thruster compartment. If
you are not confident that you have been able to seal this
comparment well, this pump is absolutely necessary.
- The control-cable system for the thruster must be installed so that
atleast all junctions and connectors are kept dry at all times.
- In the Sidepower sternthruster kit, there will be included a cable,
so that electronic controlbox originally placed on the electromotor,
can be fitted away from the thruster in a higher position securing
that it will stay dry at all times, even if there are accidental leakages
into the stern-thruster compartment. Please see instructions on the
following pages of how to connect this. If you are installing a
sternthruster without the special sternthruster tunnel available from
Sidepower, this kit can be bought seperately.
The thruster
compartment
must be kept
dry at all times
Thruster
compartment
must be kept dry
at all times
Wet bilge area
Stern thruster installation manual Version 1.6 - 2005
5
FIG. 7
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