6. After all six screws with washers are loosely driven in flush to the coupler, tighten the screws in a star pattern to the
specified torque.
Star pattern torque sequence example
Description Nm lb‑in. lb‑ft
Drive coupler mounting screws 48 – 35.4
NOTE: It does not matter which screw is the starting or ending screw during this operation, if they have been run in loosely
as per step one.
Flywheel Housing
Cleaning
1. Clean all parts in solvent.
2. Dry the parts with compressed air.
Inspection
1. Inspect the flywheel housing for cracks, damaged bolt or stud holes, and excessive wear. Replace if necessary.
2. Inspect the guide dowels for the correct amount of protrusion from the engine block. Repair if necessary.
a - Guide dowels (2)
b - Measured protrusion 13 mm (0.5 in.)
Installation
1. Align the flywheel housing on the guide dowels of the engine.
IMPORTANT: The flywheel housing fasteners must be installed in the same location as removed.
2. Install the studs and screws into their original locations.
3. Tighten the flywheel housing fasteners to the specified torque.
Description
Nm lb‑in. lb‑ft
Flywheel housing fasteners 41 – 30
4. Install the flywheel housing cover. Tighten to the specified torque.
Engine Inspection and Assembly
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 3B-65
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