4. Replace the fine element fuel filter.
Seawater System
Seawater Pump Impeller Inspection
The seawater pump impeller must be inspected (and replaced, if necessary) at the interval specified by the maintenance
schedule. It is recommended this task be performed at a Mercury Diesel authorized repair facility.
1. Close the seacock.
2. Remove the four screws on the front side of the seawater pump and remove the cover. Discard the O‑ring.
Seawater pump cover screws
3. Mark the direction of rotation of the impeller and remove the protective cap from the middle of the impeller.
a - Seawater pump
b - Impeller
c - Protective cap
d - O‑ring
e - Cover
f - Screw (4)
4. Use a suitable puller to remove the impeller from the impeller shaft.
5. Inspect the impeller for damage. The impeller must be replaced if there are any signs of damage.
NOTE: Keep an extra impeller onboard the boat at all times.
6. Lubricate the impeller with silicone spray or glycerine.
7. Push the impeller onto the shaft and press the protective cap into the impeller.
8. Insert a new O‑ring into its groove.
9. Install the cover onto the housing and secure the cover with the four screws. Tighten the screws to the specified torque.
Description
Nm lb‑in. lb‑ft
Seawater pump cover screws 4.0 35.4 –
10. Open the seacock.
11. Start the engine and check the cooling system for leaks.
Flushing and Draining the Seawater System
1. Close the seacock.
2. Open and clean the seawater filter.
3. Fill the seawater filter with fresh water and operate the engine at idle.
IMPORTANT: Keep the seawater filter filled with fresh water while the engine is running.
4. Operate the engine until the water draining from the engine runs clear to ensure that all sludge and salt residues are
flushed away.
Section 4 - Maintenance
Page 48 90-8M0133568 eng JUNE 2017
To Next Page
Loading...
