Page 258 - REPOWER REFERENCE GUIDE (2020)

8.1L/496/8.2L Triple Catalyst
6. Lift the exhaust collector carefully to prevent the catalysts from falling due to loose retaining rings.

Port exhaust manifold and collector
a - Exhaust collector
b - Catalyst
a c - Retaining ring
d - Gasket
e - Exhaust manifold

b

c

d

e

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7. Discard the gasket and current retaining rings.
8. Repeat this procedure for the other manifold as necessary.
Exhaust Manifold Removal

! WARNING

Performing service or maintenance without first disconnecting the battery can cause product damage, personal injury, or
death due to fire, explosion, electrical shock, or unexpected engine starting. Always disconnect the battery cables from the
battery before maintaining, servicing, installing, or removing engine or drive components.

1. Remove the exhaust elbow riser as described in Riser Removal.
2. Remove the collector as described in Collector Removal.
3. Disconnect any cooling hoses from the manifold.
4. Remove any other components that are mounted to the exhaust manifold.
5. Disconnect the oxygen sensor from the engine harness.
6. Disconnect the temperature sensor from the engine harness.
7. Remove two screws at opposite ends of the exhaust manifold and thread the manifold alignment stud into each screw hole.

Manifold Alignment Stud Obtain Locally
8. Remove the remaining exhaust manifold screws.
9. Remove the exhaust manifold assembly.

Page 7G-10 © 2019 Mercury Marine 90-8M0149179 eng NOVEMBER 2018