MARLOW-HUNTER 38 Manual

38 BOW THRUSTER
1. The bow thruster will be located in under the v-berth bunk, the pan is molded for the bow
thruster tube to be located there.
2. Remove the v-berth shelves from the boat by taking out the #10 x 1-1/4" screws. Also re-
move the cutout in the center divide.
3. Drill two 2" holes (one on the forward side, the other on the aft side) in the aft stringer
(running athwartship) on the port side of centerline so wires can be run from the bow
thruster to the port transducer compartment. The forward hole will be extremely hard to
drill once the tube is in place unless you have a large arbor I cut it from the aft side. Put 2"
chafe guards around the holes.
4. Place a straight edge across the top of the pan flange where the "U" shape is for the bow
thruster tube & measure down 3-1/2" at the middle of the "U" (see pictures for clarifiaca-
tion. Mark this location, this will be where the center of the tube will go. Do this on both
the port & starboard sides of the boat.
5. Drill 6" holes thru the hull at the marked locations so the drill is pointed directly at the
center of the hole on the other side of the boat, this will make semi-elliptical hole about
11" tall & 6" wide.
6. Insert the bow thruster tube thru the two holes.
7. Once tube is in & level, glass the tube into place on the inside of the boat on both the star-
board & port side, make this a thick bond as it will have a 1" radius cut into it from the
outside. On the outside of the boat cut the tube flush with the outside of the hull then put a
1" radius along the entire edge of the cutout on both the port & starboard side. Gelcoat the
hull & buff.
8. Sand & gelcoat the tube & stringer on the inside of the boat as needed.
9. Install the bow thruster in the center of the tube, the motor will go on top of the tube.
10. Install a 250 amp fuse below the nav seat then install the on/off (isolator) switch in the out-
board face forward of the nav seat.
11. From the motor route the 1/0 cables (one red 15', one yellow 17') port to the hull then aft
thru the hanging locker then continue aft thru the PVC pipe under the bunk top to the nav
station. Connect the positive cable (red) to the on/off (isolator switch ). Connect the 18"
positive (red) cable to the other side of the isolator switch the connect the other end of this
cable to the fuse that was installed earlier under the nav seat. Connect the 30" 1/0 positive
(red) cable to the other side of this fuse & connect the other end of the cable to the battery
side of the existing fuse under the battery selection panels. Connect the 1/0 negative
(yellow) cable to the negative buss bar under the nav seat.
12. Connect cables at the bow thruster unit & route control cable aft thru two new holes (they
will have to be drilled with 2" hole saw then install chafe guards) in the athwartship
stringer to the knot & depth compartment then continue thru pipe to cockpit then up to
steering pedestal.
Page 1 of 6 (1-23-2006 Update)