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Mercury 90 Operation Maintenance Installation Warranty Manual

Mercury 90
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2. Tilt the outboard to a vertical position.
3. Use a 16 mm (5/8 in.) wrench and loosen the oil drain valve so that it can
be turned by hand. Be careful not to open the valve too far allowing oil to
drain.
4. Attach a 12 mm (7/16 in.) I.D. drain hose to the oil drain valve. Position
the opposite end of the hose into an appropriate container.
5. Loosen the oil drain valve 2‑1/2 turns to allow oil to drain. Do not exceed
2‑1/2 turns.
IMPORTANT: Do not loosen the oil drain valve more than 2‑1/2 turns out. The
oil seal could get damaged beyond 2‑1/2 turns.
6. After the oil has drained, hand‑tighten the oil drain valve (clockwise) and
remove the oil drain hose.
7. Tighten the oil drain valve to the specified torque. Clean up any oil in the
valve area.
Description
Nm lb‑in. lb‑ft
Oil drain valve 15 133
IMPORTANT: Overtightening the oil drain valve can damage the oil sump.
a - Oil drain valve
b - Drain hose
c - Loosen 2‑1/2 turns maximum
CHANGING OIL FILTER
1. Remove the plug from the oil trough and attach a 12 mm (7/16 in.) I.D.
drain hose to the fitting. Position the opposite end of the hose into an
appropriate container.
2. Unscrew the old filter by turning the filter to the left.
3. Allow oil in the trough to drain and remove the oil drain hose.
4. Clean any oil from the oil trough and install the plug.
b
48870
a
1
2
2-
c
MAINTENANCE
84 eng

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Mercury 90 Specifications

General IconGeneral
BrandMercury
Model90
CategoryOutboard Motor
LanguageEnglish

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