Alternator - Delco 27SI Caterpillar


Alternator

Usage:

D6D 01Y



Illustration 1g00901139

27-SI End View

Table 1
27-SI Alternators    
Part Number     Nominal Voltage     Nominal Current    
9L-5938 Alternator Gp     12 V     58 A    
3T-7070 Alternator Gp     12 V     58 A    
9W-1082 Alternator Gp     12V     83 A    

Table 2
Specifications for 27-SI Alternators (1)    
CAT Part Number     9L5938     3T7070     9W1082    
Torque of Pulley Nut (4)     100 ± 7 N·m (75 ± 5 lb ft)    
100 ± 7 N·m (75 ± 5 lb ft)    

100 ± 7 N·m (75 ± 5 lb ft)    
Torque of Four Through Bolts (3)    
6.2 ± 0.6 N·m (5.5 ± 5 lb in)    

6.2 ± 0.6 N·m (5.5 ± 5 lb in)    

6.2 ± 0.6 N·m (5.5 ± 5 lb in)    
Torque of "B+" Terminal (Nut) (1)    
7.1 ± 0.9 N·m (63 ± 8.0 lb in)    

7.1 ± 0.9 N·m (63 ± 8.0 lb in)    

7.1 ± 0.9 N·m (63 ± 8.0 lb in)    
Torque of "B-" Terminal (Bolt) (2)    
2.3 ± 0.6 N·m (20 ± 5 lb in)    

2.3 ± 0.6 N·m (20 ± 5 lb in)    

2.3 ± 0.6 N·m (20 ± 5 lb in)    
Voltage Rating     12 V     12 V     12 V    
Rated Output Current     58 A     58 A     83 A    
Polarity     Negative Ground     Negative Ground     Negative Ground    
Rotation     CW or CCW     CW or CCW     CW    
Test Speed     5000 rpm     5000 rpm     7000 rpm    
Rated Output Current at the Test Speed     37.0 A     47.8 A     61.1 A    
Output Voltage at
25 °C (77 °F)    
27.4 ± 0.6 V     27.4 ± 0.6 V     14.0 ± 0.3 V    
Resistance of Rotor Field Winding at
27 °C (81 °F)    
2.4 to 2.7 ê     2.4 to 2.7 ê     2.2 to 2.7 ê    
Current of Rotor Field Winding at the Voltage Rating and
27 °C (81 °F)    
3.3 to 3.8 A     2.5 to 2.8 A     5.7 to 7.1 A    
Turn-On Speed at
25 °C (77 °F)    
2000 rpm     2000 rpm     2000 rpm    
( 1 ) Refer to Illustration 1.

Caterpillar Information System:

G3520B Engines MID 036 - CID 1518 - FMI 04 Cylinder #18 Detonation Sensor short to ground
G3520B Engines MID 036 - CID 1518 - FMI 03 Cylinder #18 Detonation Sensor open/short to +batt
G3520B Engines MID 033 - CID 1517 - FMI 04 Cylinder #17 Detonation Sensor short to ground
G3520B Engines MID 033 - CID 1517 - FMI 03 Cylinder #17 Detonation Sensor open/short to +batt
G3520B Engines MID 036 - CID 1514 - FMI 04 Cylinder #14 Detonation Sensor short to ground
G3520B Engines MID 036 - CID 1514 - FMI 03 Cylinder #14 Detonation Sensor open/short to +batt
G3520B Engines MID 033 - CID 1513 - FMI 04 Cylinder #13 Detonation Sensor short to ground
G3520B Engines MID 033 - CID 1513 - FMI 03 Cylinder #13 Detonation Sensor open/short to +batt
G3520B Engines MID 036 - CID 1510 - FMI 04 Cylinder #10 Detonation Sensor short to ground
797B Off-Highway Truck Steering System Front Wheel - Align
G3520B Engines MID 036 - CID 1510 - FMI 03 Cylinder #10 Detonation Sensor open/short to +batt
G3520B Engines MID 033 - CID 1509 - FMI 04 Cylinder #9 Detonation Sensor short to ground
G3520B Engines MID 111 - CID 1539 - FMI 04 Cyl #9 Exhaust Port Temp Sensor short to ground
G3520B Engines MID 111 - CID 1547 - FMI 03 Cyl #17 Exhaust Port Temp Sensor short to +batt
G3520B Engines MID 111 - CID 1548 - FMI 03 Cyl #18 Exhaust Port Temp Sensor short to +batt
G3520B Engines MID 111 - CID 1549 - FMI 03 Cyl #19 Exhaust Port Temp Sensor short to +batt
G3520B Engines MID 111 - CID 1550 - FMI 03 Cyl #20 Exhaust Port Temp Sensor short to +batt
G3520B Engines MID 111 - CID 1547 - FMI 04 Cyl #17 Exhaust Port Temp Sensor short to ground
G3520B Engines MID 111 - CID 1548 - FMI 04 Cyl #18 Exhaust Port Temp Sensor short to ground
G3520B Engines MID 111 - CID 1549 - FMI 04 Cyl #19 Exhaust Port Temp Sensor short to ground
G3520B Engines MID 111 - CID 1550 - FMI 04 Cyl #20 Exhaust Port Temp Sensor short to ground
G3520B Engines MID 111 - CID 1547 - FMI 05 Cyl #17 Exhaust Port Temp Sensor open circuit
G3520B Engines MID 111 - CID 1548 - FMI 05 Cyl #18 Exhaust Port Temp Sensor open circuit
G3520B Engines MID 111 - CID 1549 - FMI 05 Cyl #19 Exhaust Port Temp Sensor open circuit
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