Isuzu 4LE2 User Manual

5-14
INSPECTION AND MAINTENANCE
Inspecting the Generator Drive Belt
Press the center of the belt with a hand, and check whether the belt deflects only
slightly. Also, check the belt for a damage.
Measurement of Deflection Amount and
Vibration Frequency
Press the middle of the belt with a force of
98 N (approx. 10 kgf/22 lb), and check whether
the amount of deflection is within the range of
standard values.
Measure vibration frequency according to the
usage method for the ultrasonic tension gauge
and check that it is within the standard value
range.
When the value is not within the range, adjust the
tension. Also, check the belt for a damage such
as a scratch and crack. When the belt adjusting
allowance is no longer available, when crack,
damage or abnormal wear is found, or when the
belt squeaks during engine operation even after
the belt tension has been adjusted, replace the
belt.
Generator drive belt
Standard value
Amount of deflection Vibration frequency
Single belt
New belt 5.5 - 6.0 mm (0.22 - 0.24 in) 162 - 176 Hz
When reused 6.0 - 6.5 mm (0.24 - 0.26 in) 154 - 168 Hz
Double belt
New belt 7.7 - 8.7 mm (0.30 - 0.34 in) 113 - 133 Hz
When reused 8.3 - 9.3 mm (0.33 - 0.37 in) 101 - 113 Hz
Adjusting the Generator Drive Belt
1. Loosen the lock nut and mounting bolt of the
generator.
2. Turn the adjusting bolt until the belt tension
falls within the standard value range.
3. After the adjustment, firmly tighten the
loosened lock nut and mounting bolt to the
specified torque.
Lock nut tightening torque
23.5 N·m (2.4 kgf·m/17 lb·ft)
Generator Generator
Adjusting bolt
Lock nut
Mounting bolt
Adjusting bolt
Lock nut
Mounting bolt
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Isuzu 4LE2 Specifications

General

Brand	Isuzu
Model	4LE2
Category	Engine
Language	English