Westerbeke 9.0 BCG Technical Manual page 183

Spark Plugs
Service spark plugs, clean gap or replace as needed.
Spark plug gap: 0.028 - 0.036 inches
(0.7 - 0.9 mm)
Spark plug torque
BCG 4.0KW: 13.1 - 17.4lb-ft (1.8 - 2.4 kg-m)
BCG 6.5KW and BTG 9.0KW:
10.8 - 15.9 Ib-ft (1.5 - 2.2 kg-m)
Check plugs for damage and/or wear.
NOTE: Loc-tite "Anti-Seize" applied to the threaded por-
tion of the spark plugs will retard corrosion, making fu-
ture removal of the spark plugs easier.
DC Voltmeter
WEAR AND ADHESION OF CARBON
PLUG GAP
DAMAGE AND
DETERIORATION
DAMAGE
The DC voltmeter in the remote instrument panel can be a useful instrument in determining the status of your
electrical system and in warning you when an abnormality occurs. The voltmeter will indicate differently,
depending when the readings are taken.
Fully charged batteries that are in a static state should read between 12.3 and 12.6 volts on the dial. The
term static means that the battery has not been charged or discharged for at least 2 hours. If the reading is
between 11 and 11.5 volts, then the battery is about half discharged and should be charged to ensure its
usefulness. If the engine is started and the needle does not go up, this would indicate that no charge is
presently delivered to the battery.
When the battery is charging, the needle should be between 12.6 and 13 volts. The needle may move up to
about the 14.6 volt range toward the end of the charge cycle, at which time the needle drops back to the 12.6
to 13 volt range, as voltage regulation controls this function. If the battery's voltage exceeds 15 volts, this
indicates that the battery is being overcharged and the battery will be damaged if left unchecked. The volt-
age regulator is most likely at fault when this happens.
When the battery is discharging (having electrical loads placed upon it and no charging current applied), it
is normal for the needle to indicate between 11.4 and 12.6 volts.
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Westerbeke Generators