Fuel System; Propeller Replacement; Spark Plug Inspection And Replacement - Mercury 4 User Manual

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MAINTENANCE
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FUEL SYSTEM

WARNING
Avoid serious injury or death from gasoline fire or explosion. Carefully
follow all fuel system service instructions. Always stop the engine. DO
NOT smoke or allow open flames or sparks in the area while servicing any
part of the fuel system.
Before servicing any part of the fuel system, stop engine and disconnect the
battery. Drain the fuel system completely. Use an approved container to collect
and store fuel. Wipe up any spillage immediately. Material used to contain spillage
must be disposed of in an approved receptacle. Any fuel system service must be
performed in a well-ventilated area. Inspect any completed service work for signs
of fuel leakage.
Fuel Line Filter
1
Inspect the fuel line filter. If the filter appears to be contaminated, remove and
replace.
IMPORTANT: Visually inspect for fuel leakage from the filter connections by
squeezing the primer bulb until firm, forcing fuel into the filter.
Fuel Line Inspection
Visually inspect the fuel line and primer bulb for cracks, swelling, leaks, hardness,
or other signs of deterioration or damage. If any of these conditions is found, the
fuel line or primer bulb must be replaced.
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PROPELLER REPLACEMENT

WARNING
If the propeller shaft is rotated while the engine is in gear, there is the pos-
sibility that the engine will crank over and start. To prevent this type of
accidental engine starting and possible serious injury caused from being
struck by a rotating propeller, always shift outboard to neutral position
and remove spark plug leads when you are servicing the propeller.
1
Remove the spark plug lead to prevent engine from starting.
2
Move gear shift lever into neutral.
3
Straighten and remove cotter pin (a).
4
Place a block of wood between gear case and propeller to hold propeller and
remove propeller nut (b).
5
Pull propeller (c) straight off shaft. If propeller is seized to the shaft and cannot
be removed, have the propeller removed by an authorized dealer.
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PROPELLER REPLACEMENT (CONTINUED)
6
Coat the propeller shaft with Quicksilver or Mercury Precision Lubricants
Anti-Corrosion Grease or 2-4-C Marine Lubricant with Teflon.
IMPORTANT: To prevent the propeller hub from corroding and seizing to the
propeller shaft, especially in salt water, always apply a coat of the
recommended lubricant to the entire propeller shaft at the recommended
maintenance intervals and also each time the propeller is removed.
7
Install front thrust washer (a), propeller (b), rear thrust hub (c) and propeller nut
(d) onto the shaft.
8
Place a block of wood between gear case and propeller to prevent rotation and
tighten propeller nut. Secure propeller nut to the shaft with cotter pin (e).
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SPARK PLUG INSPECTION AND REPLACEMENT

Avoid serious injury or death from fire or explosion caused by a dam-
aged spark plug boot (a). A damaged spark plug boot can emit sparks.
Sparks can ignite fuel vapors under the engine cowl. To avoid damag-
ing the spark plug boot, do not use any sharp object or metal tool
such as pliers, screwdriver, etc. to remove the spark plug boot.
1
Remove the spark plug boot (a) by twisting the rubber boot slightly and pull off.
2
Remove the spark plug to inspect and clean. Replace spark plug if electrode
is worn or the insulator is rough, cracked, broken, blistered or fouled.
3
Set the spark plug gap. See Specification Chart in General Information Section.
4
Before reinstalling spark plug, clean away dirt on the spark plug seat. Install
plug finger tight, and tighten 1/4 turn or torque to 20 lb. ft. (27 N·m).
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WARNING
90-10211R30