Hydro Shield Installation Large Fin L35 and L45 – Illustrated Guide

Steps 1–3

Step 2: Attach the brackets to the foil using the carriage bolts and nyloc nuts. Do not tighten the nyloc nuts too much — the brackets should still have a little play and will be fully tightened later. Keep pressure on the heads of the carriage bolts so they do not drop down and damage the internal locking collar in the foil.

Step 3: Position the brackets with the foil on the skeg. Align the front edges of the bracket and the skeg. The bracket must not extend forward beyond the front edge of the skeg. If the skeg is bent, bend the brackets — not the skeg.

Note: On power trim installations, the top front edge of the bracket will sit farther back than the bottom.

Steps 4–5

Step 4: Use a tape measure to check dimensions A and D. For power trim installations, D must be 12 mm (1/2 inch) greater than A.

Rotate the propeller to check clearance. The minimum distance between the propeller and the Hydro Shield must be 48 mm (1 7/8 inches).

Step 5: Once the clearance has been confirmed, use a clamp to hold the brackets and Hydro Shield in place.

Steps 6–9

Step 6: Use the holes in the bracket as a template. Drill the upper rear hole first, then install the through-bolt and nyloc nut.

Step 7: Check that measurements A and D are still correctly aligned before drilling the second upper hole. Install the bolt and nyloc nut. Then drill the third hole and install the bolt and nyloc nut. If you are using urethane sealant, apply it only after you have confirmed the correct fit.

Step 8: If the bolt threads extend past the nyloc nut, cut off the excess thread to reduce cavitation and drag.

Step 9: Tighten all screws and bolts securing the brackets to the skeg and the foil. Confirm that the nyloc nuts are tight before operating the boat. Check the tightness again after the first trip.

Steps 2–5

Step 2: Attach the brackets to the foil using the carriage bolts and nyloc nuts. Do not tighten them too much — the brackets should still have a little play until the final step.

Step 3: Position the bracket with the foil on the skeg. Align the front edges. The bracket must not extend forward beyond the front edge of the skeg. If the skeg is bent, bend the brackets — not the skeg.

Step 4: Measurements A and D must be equal in length. Confirm this with a tape measure. Rotate the propeller and verify that the minimum distance between the propeller and the Hydro Shield is 48 mm (1 7/8 inches).

Step 5: Once the clearance has been confirmed, use a clamp to hold the brackets and Hydro Shield in place.

Steps 6–9

Step 6: Use the holes in the bracket as a template. Drill the upper rear hole first and install the through-bolt and nyloc nut.

Step 7: Confirm that A and D are still correctly aligned. Drill the second hole and install the bolt. Then drill the third hole and install the bolt. Urethane sealant should only be applied after the fit has been confirmed.

Step 8: If the bolt threads extend past the nyloc nut, cut off the excess thread to reduce cavitation and drag.

Step 9: Tighten all screws and bolts securing the brackets to the skeg and the foil. Confirm that the nyloc nuts are tight before operating the boat. Check the tightness again after the first trip.