Spark Plug Inspection And Replacement - Mercury 225 Manual

Anodes help protect the power package against galvanic
corrosion by sacrificing its metal to be slowly eroded instead of
other metals.
This model has three corrosion control anodes—two above and
one below the anti‑ventilation plate. A fourth anode is located on
the bottom of the clamp/swivel bracket assembly.
a
All anodes require periodic inspection, especially in saltwater
(refer to the Inspection and Maintenance Schedule). Replace
any anodes before they are 50% corroded. Never paint or apply
protective coating on the anode, as effectiveness of the anode
will be reduced.

Spark Plug Inspection and Replacement

Damaged spark plug boots may emit sparks which can ignite
fuel vapors under the engine cowl, resulting in serious injury or
death from a fire or explosion. To avoid damaging the spark
plug boots, do not use any sharp object or metal tool to remove
the spark plug boots.
MAINTENANCE
b
WARNING
!
82
a - Corrosion control
anodes (three on
gearcase)
b - Corrosion control
anode (one on
clamp/swivel
bracket)
2736
eng