Steering Pull Adjustment; Worn/Dull Impeller - Mercury 40 jet fourstroke User Manual

4. Before installing spark plugs, clean off any dirt on the spark
plug seats. Install plugs finger‑tight, and then tighten 1/4 turn
or torque to specifications.
Description
Spark plug

Steering Pull Adjustment

The steering on some boats will have the tendency to pull
towards starboard. This pulling condition can be corrected by
using a pliers and bending the ends of the exhaust fins 1.5 mm
(1/16 in.) toward the starboard side of the outboard.

Worn/Dull Impeller

The intake of gravel through the pump can round off and wear
the leading edges of the impeller. Some conditions that could be
experienced from a worn/dull impeller are as follows:
• Noticeable performance loss, especially on acceleration
• Difficulty getting the boat on plane
• An increase in engine RPM at wide‑open throttle
IMPORTANT: Do not sharpen or alter the top side lifting angle.
MAINTENANCE
Nm
27
a -
a
29573
94
lb‑in.
Exhaust fins
lb‑ft
20
eng