OPERATION. LUBRICATION. MAINTENANCE AND TUNE
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UP
57
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ENGINE TUNE
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UP
A smooth
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running, dependable marine engine is more
than a convenience. At sea, it can be the difference be
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tween life and death. To keep the engine running right,
follow a regular program of preventive maintenance.
Part of any preventive maintenance program is a thor
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ough engine tune
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up. A tune
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up is a series of adjustments
necessary to restore and maintain maximum power and
performance.
Perform an engine tune
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up as needed at periodic inter
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vals to maintain maximum engine performance. If the en
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gine is used infrequently, perform a tune
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up at least once a
season.
A
tune
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up consists of the following:
1.
Compression test.
2. Valve adjustment.
3.
Idle speed adjustment.
Careful and accurate adjustment is crucial to a success
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ful engine tune
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up. Each procedure in this section must be
performed exactly as described and in the order presented.
NOTE
Some engine settings, such as
maximum en-
gine speed and torque level, are controlled
by adjusting screws in the governor assem-
bly. These adjusting screws are set by the
manufacturer and secured by a
lockwire to
prevent unauthorized adjustment. Adjust-
ment of these screws should be performed
only by trained personnel. Detaching a
lockwire may void the engine warranty. Im
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proper adjustment can cause engine dam-
age.
Compression Test
Check the compression of each cylinder as the first step
in a tune
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up. A compression test measures the compres
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sion pressure at the end of the compression stroke. Its re
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sults can be used to assess general cylinder and valve
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