Description Nm lb‑in. lb‑ft
Air manifold bracket nut 14.9 131.8 –
Heat Exchanger Installation
1. Lower the heat exchanger onto the brackets and simultaneously attach the water hoses.
2. Ensure that all hose ends are aligned and fully seated on the heat exchanger fittings. Tighten all hose clamps securely.
3. Attach the two straps that fasten the heat exchanger to the engine.
4. Attach the MerCathode controller, if equipped.
5. Connect the air lines to the air manifold by inserting the line into the fitting until a positive stop is encountered.
6. Ensure that the air lines are installed properly.
a. Attach the air pump to the fitting on the air manifold.
a - Green indicators
b. Pull up on the air pump lever (vertical) to lock the pump onto the fitting.
c. Pump air into the system until both green indicators extend. If the green indicators do not extend, the air lines are not
attached properly.
7. Fill the closed‑cooling system with the specified coolant.
a
8223
Models with Closed Cooling
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 6C-19
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