Grady-White Boats Canyon 456, Manual, Page: 45 / 90

6-5
Chapter 6: Maintenance and Service
In addition to inspecting the scuppers, annually inspect the hoses and replace if necessary. To
inspect hose, observe water flow between the cockpit and the thru-hull. If water flow seems
restricted, a high pressure water hose can be used to flush debris from the scupper hose. If water
leaks into the hull interior from the hose or fittings, replace these components immediately before
using the boat.
Seachest
The 456 is equipped with a 7-gallon Seachest. The Seachest must be visually inspected on a
regular basis. There is a clear acrylic lid that provides easy access to view the internal components
of the Seachest. If there is build-up of debris in the bottom of the Seachest, first make sure the
seacock is closed, then remove the wing nuts and remove the access lid. Wash out the debris and
replace the lid if the rubber gasket is in good condition (no cracks and still flexible). If the gasket is
in poor condition, replace immediately and secure the lid back to the Seachest. The bolts need to be
torqued to 30lb-ft in order to avoid cracking the lid. The Seachest is sized to provide adequate water
flow to all raw water appliances. If decreased flow is observed in the Seachest, inspect the hose
attached to seacock and Seachest for marine growth or debris.
Caulking/Gasket
Deck fittings, bow rails, windows, hatches, etc. have been caulked or gasketed with the highest
quality material to ensure a waterproof joint with the boat. However, the working action of normal
use will tend to flex the joint and eventually break down the seal between them. Periodically inspect
the caulking or gaskets for leaks. Recaulk or replace the gaskets as necessary, or have your dealer
do the repair.
Hardware/Stainless Steel Rails
The hardware on your Grady-White is made of laboratory grade 316 stainless steel and needs
regular cleaning to maintain its “less staining” properties. The key to maintaining your stainless
steel is to keep it clean with a mild solution of soap and
fresh water. Remove salt or dirt from your
stainless steel on a regular basis.
Hardware Mounting
When fastening new hardware to the boat, be sure to seal the opening properly with silicone or
5200 to prevent leakage into the laminate or into the boat.
Aluminum Components
Hardtop Frames and Rod Holders
Due to the nature of aluminum and the harsh exposure conditions of the marine environment, it
is important to follow a required maintenance procedure . Failure to follow a preventative
maintenance procedure will most likely result in aluminum pitting.