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Mercury 135 Optimax Operation And Maintenance Manual

Mercury 135 Optimax
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MAINTENANCE
45
ob00422
Spark Plug Inspection And Replacement
!
WARNING
Avoid serious injury or death from fire or explosion caused by damaged spark plug boots. Damaged spark plug
boots can emit sparks. Sparks can ignite fuel vapors under the engine cowl. To avoid damaging spark plug
boots, do not use any sharp object or metal tool such as pliers, screwdriver, etc. to remove spark plug boots.
1. Remove the spark plug leads. Twist the rubber boots slightly and pull off.
ob00375
2. Remove the spark plugs to inspect. Replace spark plug if electrode is worn or the insulator is rough, cracked,
broken, blistered or fouled.
ob00423
3. Set the spark plug gap to specification.
ob00424
Spark Plug
Spark plug gap 0.80 mm (0.031 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.

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Mercury 135 Optimax Specifications

General IconGeneral
StartingElectric
ExhaustThrough Prop
Horsepower135 HP
Fuel Induction SystemDirect Fuel Injection
Alternator Amp60 Amp
Shaft Length20", 25"
Full Throttle RPM5250-5750
SteeringHydraulic

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