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Mercury 40 Service Manual

Mercury 40
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MAINTENANCE
90-828631R3 MARCH 1999 Page 1B-5
Every 100 Hours of Use or Once yearly, Whichever occurs first
1. Lubricate all lubrication points. Lubricate more frequently when used in salt water.
2. Change engine oil and replace the oil filter. The oil should be changed more often when
the engine is operated under adverse conditions such as extended trolling.
3. Inspect thermostat visually for corrosion, broken spring, and to determine that the valve
is completely closed at room temperature. If questionable, inspect thermostat as out-
lined in Section 4B “Thermostat”.
4. Inspect and clean spark plugs.
5. Check engine fuel filter for contaminants.
6. Adjust carburetor(s) (if required).
7. Check engine timing setup.
8. Check corrosion control anodes. Check more frequently when used in salt water.
9. Drain and replace gear case lubricant.
10. Lubricate splines on the drive shaft.
11. Check and adjust valve clearance, if necessary.
12. Check power trim fluid.
13. Inspect battery.
14. Check control cable adjustments.
15. Inspect timing belt.
16. Remove engine deposits with Quicksilver Power Tune Engine Cleaner.
17. Check tightness of bolts, nuts, and other fasteners.
Every 300 Hours of Use or Three Years
1. Replace water pump impeller (more often if overheating occurs or reduced water pres-
sure is noted).
Before Periods of Storage
1. Refer to Storage procedure (this section).

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Mercury 40 Specifications

General IconGeneral
Horsepower40 hp
Starting SystemElectric
SteeringRemote
Fuel Induction SystemEFI (Electronic Fuel Injection)
Shaft Length20"
Full Throttle RPM Range6000

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