Maintenance Manual of 4M11 Series Diesel Engine For Land Power Generators
108
Check for presence of high
temperature due to looseness,
oxidation, or loose connection at
the joint between wire and bolt of
charging system.
Grind the wire lugs with oxidized surfaces
and the housing surface for assembly of
grounding bolt and reassemble.
Retighten any loose nut and wire lug and
re-insert the connectors.
★
Notice: Run the reassembled or
re-tightened portions for 3~5min when the
alternator is under heavy-load and then
check for the presence of high temperature.
Check the phase output voltage
of alternator (This voltage shall
be approximately one half of B+
output voltage.)
If there is high difference between phase
terminal (W/R/AC) output voltage and
normal output, the alternator rectifier bridge
or stator is malfunction and the checking
and replacement shall be considered.
Check the battery for normal
charging.
The charging current shall drop to
approximately 10A after 10min charging. If
the charging current is at 30~90A
constantly, the battery is damaged and
needs repair or replacement.
c) High charging voltage
Malfunction 3: High charging voltage
Veh ic le
symptom
Fault Detection Solution
The
voltmeter
indicates
high voltage
Check voltmeter for damage. The measurement of alternator B+ terminal
voltage generally shall be at 27~28.4V. If the
voltage is normal, it indicates that the calibration
error of voltmeter is high and the voltmeter needs
to be repaired or replaced.
Check the wires and connections of the
charging system, check the connection bolts
for presence of looseness, loose connection,
and high temperature, and check for presence
of short-circuit between wires and alternator
housing.
In event of poor contact or loose connection,
retighten or re-insert the connectors.
In event of short-circuit, re-connect the wires.
Check battery for normal working status. Observe during the charging of battery whether
the charging current varies greatly within a short
period (from 50A to below 10A). If not, the
replacement of battery as soon as possible shall be
considered.
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