Mercury MERCRUISER, Service Manual, Page: 417 / 566

Exploded View
a - Exhaust manifold drain fitting ‑ used on models with standard
cooling
b - Inline T‑fitting ‑ used on models with closed cooling
c - Ball seat
d - Check ball
e - O‑ring
f - Drain fitting (if removed, do not reuse)
Inspection and Cleaning
1. Drain the seawater system.
2. Remove the seawater hoses from the check valve assembly.
3. For models with standard cooling, remove the check valve assembly from the manifold.
4. Use a screwdriver to pry the drain fitting from the assembly. Discard the drain fitting.
5. Inspect the remaining parts for debris or damage. Clean or replace parts as necessary.
6. Use a new drain fitting for reassembly.
56640
a
b
d
e
f
c
All Models
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 6A-13