Mercury 135 Verado FourStroke, Operation And Maintenance Manual

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a. All of the spark plugs should have the gap checked and corrected as
necessary before installation.
b. Measure the gap with a feeler gauge or pin gauge. Never use a
wedge‑type gap checking tool to inspect or to adjust the gap.
c. If an adjustment is necessary, do not pry or apply any force on the
center electrode. This is critical with any type of spark plug that has a
wear surface, such as platinum or iridium added to either the ground
electrode or the center electrode.
d. When it is necessary to widen the gap, use a tool that only pulls back
on the ground electrode without touching the center electrode, the
porcelain, or the wear portion of the ground electrode.
e. When it is necessary to close the gap, gently tap the plug ground
electrode on a hard surface.
6. Saltwater use ‑ Apply a thin coating of Anti‑Seize Compound only on
threads of spark plugs.
SPARK PLUG INSTALLATION
1. Before installing the spark plugs, clean off any dirt on the spark plug
seats. Install plugs finger‑tight, and then tighten 1/4 turn or tighten to the
specified torque.
Description Nm lb‑in. lb‑ft
Spark plug 27 – 20
2. Push the pencil coils into place over the spark plugs using a twisting
motion.
3. Secure the coils with retained bolts. Tighten to the specified torque.
Description Nm lb‑in. lb‑ft
Bolts 8 71 –
4. Connect the wiring harness connectors to the pencil coil connections.
a - Wiring harness connector
b - Pencil coil
c - Bolt
5. Install the cowl lock, rear cowl, and rear cowl latch. Tighten to the
specified torque.
Description Nm lb‑in. lb‑ft
Rear cowl latch ‑ back screws (4) 15 53 –
a
b
c
3658
MAINTENANCE
80
eng