Mercury 40 Jet User Manual

MAINTENANCE
75
1. Remove the spark plug boots. Twist the rubber boots slightly
and pull off.
26899
2. Remove the spark plugs to inspect. Replace spark plug if
electrode is worn or the insulator is rough, cracked, broken,
blistered, or fouled.
26946
3. Set the spark plug gap to specification.
26947
Spark Plug
Spark plug gap 1.0 mm (0.040 in.)
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 Nm lb. in. lb. ft.
Spark plug 27 20

Mercury 40 Jet Specifications

General

Cylinders	3
Starting	Electric
Steering	Remote
Shaft Length	20 in
Horsepower	40 HP
Alternator Output	226-watt
Warranty	3 years