Sterndrive Water Inlets Check - Mercury TDI 3.0L Owner's Operation And Maintenance Manual

2. Remove the four screws on the front side of the seawater pump and remove the cover. Discard the O‑ring.
3. Mark the direction of rotation of the impeller and remove the protective cap from the middle of the impeller.
a
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
Seawater pump cover screws
10. Open the seacock.
11. Start the engine and check the cooling system for leaks.

Sterndrive Water Inlets Check

1. Obtain a piece of wire the appropriate size to insert into the water inlets holes.
2. Insert the wire in and out of the sterndrive water inlets to ensure that they are open and to remove debris or marine growth.
Do not scrape the sterndrive paint.
90-8M0145546 MAY 2018
eng
Seawater pump cover screws
c e
b d
50720
50717
f
a - Seawater pump
b - Impeller
c - Protective cap
d - O‑ring
e - Cover
f - Screw (4)
Section 4 - Maintenance
Nm lb‑in.
4.0 35.4
Page 61
lb‑ft
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