Westerbeke 9.0 BCG Technical Manual page 212

1. Capacitor (Field Testing of the Capacitor[s))
One capacitor is used in the BCG 4.0KW
&
BCD 4.4KW generator sets, and two
capacitors in series are used in the BCG
6.5KW & BCD 6.0KW generator sets.
With a capacitor meter, test the
capacitor following the instructions
found with the meter, and compare the
results with the value shown on the
capacitor.
Field Testing Capacitor(s)
When a capacitor meter is not available, follow the following simple field test.
8.
Unplug connections from the capacitor. (NOTE: Mark on the connections so they can be reinstalled
correctly.)
b. With a jumper, short across the two connections on each capacitor that the two leads in step
8
were
unplugged from. This will make sure the capacitor is discharged as it should be at shutdown.
c. With your ohmmeter set on the high R scale, place its plus (
+ )
lead on one capacitor connection and
the negative (-) lead on the other capacitor connection. A resistance should be read and should rise
slowly as the meter attempts to charge the capacitor. This indicates a presumably good capacitor.
d.lndications of a defective capacitor:
1. Zero resistance - no rise in resistance value (shorted capacity).
2. Infinite resistance - (open capacitor).
3. No continuity should be found between the capacitor's connections and the capacitor's
case or base.
2. Capacitor Ratings (Capacitor Meter)
*BCG 4.0KW: 31.5 microfarads (uF) ±5°
*BCD 4.4KW: 31.5 microfarads (uF) ±5°
BCG 6.5KW: 31.5 microfarads (uF) ±5°
BCD 6.0KW: 31.5 microfarads (uF) ±5°
NOTE: Ratings are found on the capacitor case.
Early model 4.0 BCG and 4.4 BCD had 25.0
microfarad (uF) capacitors.
* NOTE: The older BCG 4.0KW and BCD 4.4KW models had 25.0 microfarad capacitors. All
new models now have 31.5 microfarad capacitors as standard equipment. When replacing
an older model's capacitor, be sure to replace it with the same rated capacitor that was
removed. Then perform a no-load voltage check as described on page 217.
Westerbeke Generators 206