Mounting The Transducer In A Hull With A Dead Rise - Raymarine DownVision CPT-70 Installation Instructions Manual

6.2 Mounting the transducer in a hull
with a dead rise
When mounting the transducer in a hull that has a dead rise
angle the transducer should be mounted following the steps
below.
Important: Do NOT remove the label attached to the
transducer cable as it contains important information.
1 Transducer cable
2 Vessel hull
3 Nut
4 Marine grade adhesive sealant — suitable for submerged
applications (not supplied)
5 Top half of Dead rise block
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Bottom half of Dead rise block
7 Threaded Tube
8 Transducer
1. Align the bottom half of the Dead rise block so that it is
parallel to the centerline (keel) of the vessel.
2. Using a permanent marker, draw around the outside edge of
the block and the internal hole for the threaded tube.
3. Remove the block from the hull.
4. Drill a pilot hole in the center of the location marked out on
the hull for the threaded tube.
5. Drill the hole out using a suitable size hole cutter.
6. Using sandpaper and / or a file ensure there are no rough
edges or burrs.
7. Ensure all surfaces are clean and free from debris.
8. Apply a thick bead of marine grade adhesive sealant all
around the edge of the top face of the transducer and the
bottom face of the Dead rise block.
9. Apply a thick bead of marine grade adhesive sealant up
each side of the threaded tube, ensuring that the sealant will
protrude approximately 6 mm above the final tightened nut.
10. Feed the transducer cable through the dead rise block's
threaded tube hole.
11. Push the dead rise block down onto the transducer ensuring
that the locators on the block line up with the locator holes
on the transducer.
12. Apply a thick bead of marine grade adhesive sealant all
around the edge of the top face of the bottom half of the cut
dead rise block, where it will meet the hull.
13. Apply a thick bead of marine grade adhesive sealant all
around the edges of the hole in the hull.
14. Guide the transducer cable and threaded tube up through
the vessel hull and ensure the transducer is lined up with
the markings made in step 2.
15. Apply a thick bead of marine grade adhesive sealant all
around the edge of the bottom face of the top half of the cut
dead rise block, where it will meet the hull.
Mounting
16. With a person inside the vessel, place the top half of the
dead rise block over the threaded tube.
17. Apply a thick bead of marine grade adhesive sealant all
around the edge of the top face of the top half of the cut dead
rise block, where it will meet the nut.
18. Apply a thick bead of marine grade adhesive sealant to the
bottom of the nut.
19. Ensuring that the dead rise block and transducer do not
move, secure the transducer assembly by tightening the nut.
20. Tighten the nut as follows:
• Plastic transducer — Hand tighten, plus a quarter turn
of the adjustable spanner.
• Bronze transducer — Use an adjustable spanner to
tighten.
• Wooden hull — Allow the wooden hull to swell prior to
tightening the nut using the adjustable spanner.
In order to prevent leaks and transducer movement when hit
by waves etc., ensure that the nut is adequately tightened.
You should see the sealant protruding from the edges of the
applied surfaces.
Do NOT overtighten. Overtightening can cause damage to
the transducer and hull which may result in water leaking
into the hull.
21. Remove any excess adhesive sealant.
22. Ensure that the sealant has fully cured before putting the
vessel back in the water.
Refer to the sealant manufacturers instructions for curing
times.
23. Once the vessel has been put back in the water check for
leaks immediately.
24. Check for leaks at regular intervals after installation until you
are satisfied that there are no leaks.
25. Ensure checking for leaks around the transducer is added to
your routine vessel maintenance schedule.
1 Nut
2 Top half of dead rise block
3 Bottom half of dead rise block
4 transducer
5 Marine grade adhesive sealant — suitable for submerged
applications (not supplied)
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