Propeller Replacement; Spark Plug Inspection - Mercury 140 Manual

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MAINTENANCE
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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
Shift outboard to neutral (N) position.
2
Remove spark plug leads to prevent engine from starting. Refer to Spark Plug
Inspection and Replacement Section following for spark plug lead removal.
3
Straighten the bent tabs on the propeller nut retainer.
4
Place a block of wood between gear case and propeller to hold propeller and
remove propeller nut.
5
Pull propeller 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
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
Flo-Torque I Drive Hub Propellers – Install thrust washer (a), propeller (b),
continuity washer (c), thrust hub (d), propeller nut retainer (e), and propeller
nut (f) onto the shaft.
8
Flo-Torque II Drive Hub Propellers – Install forward thrust hub (a), replaceable
drive sleeve (b), propeller (c), thrust hub (d), propeller nut retainer (e) and
propeller nut (f) onto the shaft.
9
Place a block of wood between gear case and propeller and torque propeller
nut to 55 lb. ft. (75 N·m).
10
Secure propeller nut by bending three of the tabs into the thrust hub grooves.
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SPARK PLUG INSPECTION

Avoid serious injury or death from fire or explosion caused by damaged
spark plug boots (a). 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 by twisting the rubber boots slightly and pull off.
2
Remove the spark plugs to inspect and clean. Replace spark plug if electrode
is worn or the insulator is rough, cracked, broken, blistered, or fouled.
3
Before reinstalling spark plugs, clean away dirt on the spark plug seats. Install
plugs finger tight, and tighten 1/4 turn or torque to 20 lb. ft. (27 N·m).
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WARNING
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