DETROIT DIESEL 53
TROUBLE SHOOTING
CHECKING ENGINE ELECTRICAL GENERATING SYSTEM
In analyzing generator-regulator operation, check for one of the five following conditions.
1. A fully charged battery and low charging rate this indicates normal generator-regulator operation.
2. Low battery and high charging rate--indicates normal generator-regulator operation.
3. A fully charged battery and a high charging rate--this indicates the voltage regulator is not reducing the generator
output as it should and will damage the battery--and may be caused by improper voltage regulator setting, defective
regulator unit, short circuit or poor connections in the generator or regulator wiring or high battery temperature.
4. Low battery and low or no charging rate--indicates improper or no regulator operation--and may be due to loose
connections, damaged wires, low voltage or current regulator setting, oxidized contact points or a defective generator.
5. Excessive arcing at contact points--may be due to oxidized or misaligned contact points, defective regulator winding,
poor cable connections or other causes.
If one of the latter three conditions exists, refer to the "Delco-Remy" electrical equipment operation and maintenance
handbooks DR 324, DR 324A and DR 324S for correction of the problems. These manuals may be obtained from United
Motors Service.
SPECIFICATIONS
STANDARD BOLT AND NUT TORQUE SPECIFICATIONS
THREAD
TORQUE
THREAD
TORQUE
SIZE
(lb-ft)
SIZE
(lb-ft)
1/4-20 ................................................... 7-9
9/16-12............................................................. 90-100
1/4-28 ................................................... 8-10
9/16-18........................................................... 107-117
5/16-18.................................................. 13-17
5/8-11............................................................. 137-147
5/16-24.................................................. 15-19
5/8-18 ............................................................ 168-178
3/8-16 ................................................... 30-35
3/4-10............................................................. 240-250
3/8-24 ................................................... 35-39
3/4-16............................................................ 290-300
7/16-14.................................................. 46-50
7/8-9 ............................................................ . 410-420
7/16-20.................................................. 57-61
7/8-14 ............................................................ 475-485
1/2-13 ................................................... 71-75
1-8.................................................................. 580-590
1/2-20 ................................................... 83-93
1-14................................................................ 685-695
EXCEPTIONS TO STANDARD BOLT AND NUT TORQUE SPECIFICATIONS
APPLICATION
THREAD
TORQUE
SIZE
(lb-ft)
Tachometer drive cover bolt ............................................................
7/16-14
30-35
Tachometer drive cover bolt ............................................................
1/2-13
30-35
Tachometer drive shaft (blower) .......................................................
1/2-20
55-65
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