Mercury MERCRUISER, Service Manual, Page: 420 / 566

IMPORTANT: Do not reuse pinch‑type hose clamps. If pinch‑type hose clamps were taken off during the removal
procedure, use new worm‑gear hose clamps during assembly.
8. Position the poppet valve assembly at the rear of the engine. Attach the five seawater hoses to the assembly, and secure
them with hose clamps.
9. Attach the poppet valve assembly and two J‑clips to the poppet valve bracket using two M6 x 12 screws. Tighten the
screws to the specified torque.
Description Nm lb‑in. lb‑ft
M6 x 12 screws 8.5 75.2 –
10. After repairs are complete, pressurize the system (such as by starting the engine) and check for leaks.
Water Distribution Housing
Removal
1. Drain the seawater section of the cooling system.
2. On an Alpha manual single‑point drain, remove the drain rod from the water distribution housing.
a. Remove the C‑clip from the drain rod. Retain the C‑clip.
b. Turn the drain rod handle counterclockwise until the drain rod threads clear the alignment bracket. Pull the drain rod
straight up to remove.
a - Drain rod with blue handle
b - C‑clip
c - Drain rod threads
d - Drain rod alignment bracket
e - Bracket for the water distribution housing
f - Water distribution housing assembly
3. On an air‑actuated single‑point drain, remove each air line from the water distribution housing by pressing on the air valve
fitting's release location and pulling the line out.
51168
Release location on the air valve fitting
4. Disconnect the hoses from the water distribution housing.
5. Remove the bolt and nut attaching the water distribution housing and bracket to the engine.
6. Remove the bracket from the water distribution housing.
Cleaning and Inspection
1. Clean the water distribution housing with water and dry with a clean cloth or compressed air.
2. Inspect the housing for leaks, cracks, or corrosion damage. Replace, if necessary.
Water Distribution Housing Installation
1. Align the water distribution housing with the bracket.
2. Install and tighten the screws to the specified torque in the following order.
a. Top right screw
All Models
Page 6A-16 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015