3N6720 AUXILIARY DRIVE GROUP ALSO PART OF 3N7846 FAN DRIVE GROUP AN ATTACHMENT D379B GEN SET ENGINE



BASIC ENGINE
DRIVE GP-AUXILIARY
CYLINDER HEAD GP

GEN SET ENGINE D379B GEN SET ENGINE 34Z
 D379B GENERATOR SET ENGINE 34Z00001-UP SEBP1289 D379B 34Z   (1980)

BASIC ENGINE

DRIVE GP-AUXILIARY
DRIVE GP-AUXILIARY
3N-6720 DRIVE GP-AUXILIARY
DRIVE GP-AUXILIARY
6L-2120 DRIVE GP-AUXILIARY
SHAFT GP-STUB
3N-6721 SHAFT GP-STUB
 

#SEBP12890020
 

3N-6720: DRIVE GP-AUXILIARY

3N6720 AUXILIARY DRIVE GROUP
ALSO PART OF 3N7846 FAN DRIVE GROUP
AN ATTACHMENT
c153646 SEBP1289
3N6720 DRIVE GP-AUXILIARY Parts scheme
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Parts for your D379B GEN SET ENGINE:

Pos. Part No Qty Parts name Comments
  5L-1858 [1] PULLEY  
  5L-1855 [1] PLATE  
  9S-1366 [2] BOLT  
  4H-6173 [1] LOCK  
  3N-2147 [1] SHAFT  
  0L-1178 [10] BOLT  
  3B-4512 [10] LOCKWASHER  
  3L-0526 H [2] BOLT  
  3B-4507 [2] LOCKWASHER  
    (Mounted on Accessory Drive Housing)
  H   NOT SHOWN
 

#SEBP12890021
 

6L-2120: DRIVE GP-AUXILIARY

6L2120 AUXILIARY DRIVE GROUP-SAE STANDARD ENGINE ROTATION
40 HORSEPOWER MAXIMUM AT 133 R.P.M.
{FOR USE WITH SEA WATER PUMP}
AN ATTACHMENT
c229713 SEBP1289
6L2120 DRIVE GP-AUXILIARY Parts scheme
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Parts for your D379B GEN SET ENGINE:

Pos. Part No Qty Parts name Comments
1. 3F-5022 [1] PLUG  
2. 4L-3748 [1] RETAINER ASSEM.  
3. 6L-2135 [1] RETAINER ASSEM.  
    (Each Includes)
4. 5L-2660 C [1] BEARING  
5. C [1] BALL  
6. 1A-2029 [7] BOLT 28.5 mm (1.125 in.)  
7. 3B-4506 [10] LOCKWASHER  
8. 5H-6012 [1] SEAL  
9. 6L-2166 [1] SHAFT  
10. 6T-2040 [1] KEY  
11. 4L-3756 [1] BEARING  
12. 8N-1358 C [1] GEAR  
13. 6F-7030 [6] BOLT  
  4L-3759 [3] LOCK  
14. 0S-1594 [5] BOLT 25.4mm (1 in.)  
15. 7F-7510 [4] LOCK  
16. 4L-3437 [2] GASKET  
17. 5L-5840 [2] WASHER (small)  
  4B-4278 C [2] WASHER (large)  
18. 2A-4639 C [4] BOLT  
  C   INDICATES CHANGE
 

#SEBP12890022
 

3N-2680: CYLINDER HEAD GP

3N2680 HEAD & VALVE GP-CYLINDER PART 1 OF 2*R
S/N 34Z1-513
c175126 SEBP1289
3N2680 CYLINDER HEAD GP Parts scheme
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Parts for your D379B GEN SET ENGINE:

Pos. Part No Qty Parts name Comments
1. 4H-6716 [24] WASHER  
  1B-9917 [3] SPRING (Short)  
  6F-5034 [4] SPRING (Long)  
2. 3B-4621 [8] COTTER PIN  
3. 0L-1351 [8] BOLT  
  3B-4506 [8] LOCKWASHER  
4. 6H-3217 [4] SHAFT ASSEM.  
5. 4F-4585 [2] PLUG  
6. 005-1608 C [2] BOLT  
7. 8M-8509 [1] LOCK  
8. 2N-3553 [5] SEAL  
9. 8S-9089 [16] BOLT  
  3F-4550 [8] LOCK  
10. 1B-4204 [16] NUT  
11. 1A-0744 [16] SCREW  
12. 2N-3227 [4] BRACKET  
13. 5L-5486 [16] LIFTER ASSEM.  
14. 3N-1598 [1] ELBOW ASSEM.  
15. 5M-4987 [2] DOWEL  
16. 4L-7820 [16] ROD ASSEM.  
17. 1P-8372 [8] GASKET KIT  
18. 7B-2420 [24] FERRULE  
  6L-7814 [24] SEAL  
19. 7S-5787 [8] CHAMBER ASSEM.  
20. 6L-7816 [8] SEAL  
21. 2N-3598 [4] COVER  
22. 4H-9811 [8] ARM ASSEM. (Exhaust)  
23. 9F-8254 [1] SOCKET  
24. 3F-7445 [1] BUSHING  
25. 4L-3855 [8] ARM ASSEM. (Intake)  
26. 9F-8254 [1] SOCKET  
27. 3F-7445 [1] BUSHING  
  C   INDICATES CHANGE
 

#SEBP12890023
 

3N-2680: CYLINDER HEAD GP

3N2680 HEAD & VALVE GP-CYLINDER PART 2 OF 2*R
S/N 34Z1-513
c175127 SEBP1289
3N2680 CYLINDER HEAD GP Parts scheme
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Parts for your D379B GEN SET ENGINE:

Pos. Part No Qty Parts name Comments
1. 4H-0945 [4] FITTING  
  4H-2495 [1] NUT  
  4H-2494 [1] SLEEVE  
2. 2N-3597 [4] SEAL  
3. 4L-3803 [8] BRACKET  
4. 4L-8188 [8] STUD  
5. 1B-4205 [16] NUT  
6. 1F-3278 [4] FITTING  
  1F-1344 [1] NUT  
7. 4L-7892 [4] TUBE  
8. 6B-6682 [64] NUT  
  5H-1504 [64] WASHER  
9. 7L-0138 R [4] HEAD ASSEM.  
10. 8M-4014 [2] INSERT (Exhaust)  
  4S-8906 H [2] INSERT (.005" Oversize)  
  4S-8907 H [2] INSERT (.010" Oversize)  
  5S-1757 [2] INSERT (Intake)  
  4S-8908 H [2] INSERT (.005" Oversize)  
  4S-8909 H [2] INSERT (.010" Oversize)  
11. 5H-7071 [8] DIRECTOR  
12. 6N-8847 C [2] GUIDE (Exhaust)  
  4N-3664 C [2] GUIDE (Intake)  
13. 3B-0645 [8] PLUG  
14. 3N-1414 C [4] SPACER  
15. 3N-3220 [4] GASKET (Copper)  
  6L-4497 [4] GASKET (Plain)  
16. 7N-7639 C [16] ROTATOR  
17. 9M-5350 [16] SPRING (Outer)  
  9M-5349 [16] SPRING (Inner)  
18. 3B-1143 [48] LOCK  
19. 9F-7707 [16] RING  
20. 8F-8858 [16] BUTTON  
21. 3B-1142 [8] RETAINER (Exhaust)  
22. 3H-5867 [8] RETAINER (Intake)  
  8F-9206 [8] SEAL  
23. 6L-7813 [32] SEAL  
24. 6B-6224 [32] FERRULE  
25. 8F-4994 [8] SEAL  
26. 3F-9780 [8] WASHER  
27. 4L-8189 [8] STUD  
  5B-2383 [8] NUT  
28. 8H-7097 [8] VALVE (Exhaust)  
  7M-7817 [8] VALVE (Intake)  
  H   NOT PART OF 7L138 ASSEM.
  R   REMFG PART MAY BE AVAILABLE
  C   INDICATES CHANGE
 

#SEBP12890024
 

3N-2680: CYLINDER HEAD GP

3N2680 HEAD & VALVE GP-CYLINDER-PART 1 OF 2*R
S/N 34Z514-942
c179297 SEBP1289
3N2680 CYLINDER HEAD GP Parts scheme
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Parts for your D379B GEN SET ENGINE:

Pos. Part No Qty Parts name Comments
1. 4H-6716 [24] WASHER  
  1B-9917 [8] SPRING (Short)  
  6F-5034 [4] SPRING (Long)  
2. 3B-4621 [8] COTTER PIN  
3. 0L-1351 [8] BOLT  
  3B-4506 [8] LOCKWASHER  
4. 6H-3217 [4] SHAFT ASSEM.  
5. 4F-4585 [2] PLUG  
6. 0S-1608 [2] BOLT  
7. 8M-8509 [1] LOCK  
8. 2N-3553 [5] SEAL  
9. 8S-9089 [16] BOLT  
  3F-4550 [8] LOCK  
10. 1B-4204 [16] NUT  
11. 1A-0744 [16] SCREW  
12. 2N-3227 [4] BRACKET  
13. 5L-5486 [16] LIFTER ASSEM.  
14. 3N-1598 [1] ELBOW ASSEM.  
15. 5M-4987 [2] DOWEL  
16. 4L-7820 [16] ROD ASSEM.  
17. 1P-8372 [8] GASKET KIT  
18. 7B-2420 [24] FERRULE  
  6L-7814 [24] SEAL  
19. 7S-5787 [8] CHAMBER ASSEM.  
20. 6L-7816 [8] SEAL  
21. 2N-3598 [4] COVER  
22. 4H-9811 [8] ARM ASSEM. (Exhaust)  
23. 9F-8254 [1] SOCKET  
24. 3F-7445 [1] BUSHING  
25. 4L-3855 [8] ARM ASSEM. (Intake)  
26. 9F-8254 [1] SOCKET  
27. 3F-7445 [1] BUSHING  
 

#SEBP12890025
 

3N-2680: CYLINDER HEAD GP

3N2680 HEAD & VALVE GP-CYLINDER-PART 2 OF 2*R
S/N 34Z514-942
5N8320-PAGE 13D
c179298 SEBP1289
3N2680 CYLINDER HEAD GP Parts scheme
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Parts for your D379B GEN SET ENGINE:

Pos. Part No Qty Parts name Comments
1. 4H-0945 [4] FITTING  
  4H-2495 [1] NUT  
  4H-2494 [1] SLEEVE  
2. 2N-3597 [4] SEAL  
3. 4L-3803 [8] BRACKET  
4. 4L-8188 [8] STUD  
5. 1B-4205 [16] NUT  
6. 1F-3278 [4] FITTING  
  1F-1344 [1] NUT  
7. 4L-7892 [4] TUBE  
8. 6B-6682 [64] NUT  
    (- OR -
  1D-4623 C [64] BOLT  
  5H-1504 [64] WASHER  
9. 5N-8320 CY [4] HEAD GROUP  
    (Separate Illustration)
10. 9F-7707 [16] RING  
11. 8F-8858 [16] BUTTON  
12. 6L-7813 [32] SEAL  
13. 6B-6224 [32] FERRULE  
14. 3N-3220 [4] GASKET (copper)  
15. 6L-4497 [4] GASKET (plain)  
16. 8F-4994 [8] SEAL  
17. 3F-9780 [8] WASHER  
18. 4L-8189 [8] STUD  
  5B-2383 [8] NUT  
  C   INDICATES CHANGE
 

#SEBP12890026
 

3N-2680: CYLINDER HEAD GP

3N2680 HEAD & VALVE GP-CYLINDER-PART 1 OF 2*R
S/N 34Z943-UP
c310246 SEBP1289
3N2680 CYLINDER HEAD GP Parts scheme
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Parts for your D379B GEN SET ENGINE:

Pos. Part No Qty Parts name Comments
1. 4H-6716 [24] WASHER  
  1B-9917 [8] SPRING (SHORT)  
  6F-5034 CY [4] SPRING (LONG)  
2. 3B-4621 [8] PIN-COTTER  
3. 0L-1351 [8] BOLT  
  3B-4506 [8] LOCKWASHER  
4. 6H-3217 [4] SHAFT AS  
5. 4F-4585 [2] PLUG-CORE  
6. 0S-1608 [2] BOLT  
7. 8M-8509 [1] LOCK-NUT  
8. 2N-3553 [5] SEAL  
9. 8S-9089 [16] BOLT  
  3F-4550 [8] LOCK-NUT  
10. 1B-4204 [16] NUT-FULL  
11. 1A-0744 [16] SCREW-ROCKER ADJ  
12. 2N-3227 [4] BRACKET-LIFT GUIDE  
13. 5L-5486 [16] LIFTER AS-VALVE  
14. 3N-1598 [1] ELBOW AS-GALLERY  
15. 5M-4987 [2] DOWEL  
16. 4L-7820 [16] ROD AS-PUSH  
17. 1P-8372 [8] KIT-GASKET  
18. 7B-2420 [24] FERRULE-DIRECTOR  
  6L-7814 [24] SEAL-DIRECTOR  
19. 7S-5787 [8] CHAMBER AS  
20. 6L-7816 [8] SEAL-O-RING  
21. 2N-3598 [4] COVER-CYLINDER HEAD  
22. 4H-9811 [8] ROCKER ARM AS-EXHAUST (EXHAUST)  
23. 9F-8254 [1] SOCKET-ARMATURE  
24. 3F-7445 [1] BUSHING  
25. 4L-3855 [8] ROCKER ARM AS-INLET (INTAKE)  
26. 9F-8254 [1] SOCKET-ARMATURE  
27. 3F-7445 [1] BUSHING  
  C   CHANGE FROM PREVIOUS TYPE
  Y   SEPARATE ILLUSTRATION
 

#SEBP12890027
 

3N-2680: CYLINDER HEAD GP

3N2680 HEAD & VALVE GP-CYLINDER-PART 2 OF 2*R
S/N 34Z943-UP
5N8882-PAGE 13C.02
c310247 SEBP1289
3N2680 CYLINDER HEAD GP Parts scheme
  For full view, you need register

Parts for your D379B GEN SET ENGINE:

Pos. Part No Qty Parts name Comments
1. 4H-0945 [4] ELBOW  
  4H-2495 [1] NUT  
  4H-2494 [1] SLEEVE-FITTING  
2. 2N-3597 [4] SEAL-VALVE COVER  
3. 4L-3803 [8] BRACKET-SHAFT  
4. 4L-8188 [8] STUD-TAPERLOCK  
5. 1B-4205 [16] NUT  
6. 1F-3278 [4] FITTING  
  1F-1344 [1] NUT  
7. 4L-7892 [4] TUBE-SHAFT OIL  
8. 6B-6682 [64] NUT-FULL  
    -OR-
  1D-4623 [64] BOLT  
  5H-1504 [64] WASHER-HARD  
9. 5N-8882 [4] CYLINDER HEAD GP  
10. 9F-7707 C [16] RING-RETAINER  
11. 8F-8858 [16] BUTTON  
12. 6L-7813 CY [32] SEAL-FERRULE  
13. 6B-6224 [32] FERRULE  
14. 3N-3220 [4] GASKET (COPPER)  
15. 6L-4497 [4] GASKET (PLAIN)  
16. 8F-4994 [8] SEAL-O-RING  
17. 3F-9780 [8] WASHER-COVER  
18. 4L-8189 [8] STUD-TAPERLOCK  
  5B-2383 [8] NUT-SELF LOCKING  
  C   CHANGE FROM PREVIOUS TYPE
  Y   SEPARATE ILLUSTRATION
 

#SEBP12890028
 

5N-8882: CYLINDER HEAD GP

5N8882 CYLINDER HEAD GP
S/N 34Z943-UP
PART OF 3N2680 HEAD & VALVE-CYLINDER
c238059 SEBP1289
5N8882 CYLINDER HEAD GP Parts scheme
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Parts for your D379B GEN SET ENGINE:

Pos. Part No Qty Parts name Comments
1. 3N-1414 [4] SPACER  
2. 7N-7639 [4] ROTATOR-VALVE  
3. 2A-4429 [8] LOCK-RETAINER  
4. 2N-9297 [2] RETAINER-VALVE SPRING (EXHAUST)  
5. 9M-5350 [4] SPRING (OUTER)  
6. 9M-5349 [4] SPRING (INNER)  
7. 5N-8319 R [1] CYLINDER HEAD AS  
8. 2N-9299 [2] GUIDE-VALVE (EXHAUST)  
  2N-9298 [2] GUIDE-VALVE (INTAKE)  
9. 8M-4014 [2] INSERT-SEAT EXHAUST  
  5S-1757 [2] INSERT (INTAKE)  
10. 5H-7071 [8] DIRECTOR-WATER  
11. 3B-0645 [8] PLUG-CUP  
12. 1W-1822 [2] VALVE-EXHAUST  
  1W-8606 [2] VALVE-INLET (INTAKE)  
13. 1W-3062 [2] RETAINER AS (INTAKE)  
    (EACH INCLUDES)
  8N-7780 [1] SHIELD-OIL  
  R   REMFG PART MAY BE AVAILABLE
 

#SEBP12890029
 

5N-8320: CYLINDER HEAD GP

5N8320 CYLINDER HEAD GP
S/N 34Z514-942
PART OF 3N2680 HEAD & VALVE-CYLINDER
c310401 SEBP1289
5N8320 CYLINDER HEAD GP Parts scheme
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Parts for your D379B GEN SET ENGINE:

Pos. Part No Qty Parts name Comments
1. 3N-1414 [4] SPACER  
2. 7N-7639 [4] ROTATOR-VALVE  
3. 2A-4429 FY [8] LOCK-RETAINER  
4. 2N-9297 [2] RETAINER-VALVE SPRING (EXHAUST)  
5. 9M-5350 [4] SPRING  
6. 9M-5349 [4] SPRING  
7. 5N-8319 C [1] CYLINDER HEAD AS  
8. 2N-9299 [2] GUIDE-VALVE (EXHAUST)  
  2N-9298 [2] GUIDE-VALVE (INTAKE)  
9. 8M-4014 R [2] INSERT-SEAT EXHAUST (EXHAUST)  
  5S-1757 [2] INSERT (INTAKE)  
10. 5H-7071 [8] DIRECTOR-WATER  
11. 3B-0645 [8] PLUG-CUP  
12. 1W-1822 [2] VALVE-EXHAUST (EXHAUST)  
  1W-8606 [2] VALVE-INLET (INTAKE)  
13. 1W-3062 [2] RETAINER AS (INTAKE)  
    (EACH INCLUDES)
  8N-7780 C [1] SHIELD-OIL  
  C   CHANGE FROM PREVIOUS TYPE
  F   NOT SHOWN
  R   REMFG PART MAY BE AVAILABLE
  Y   SEPARATE ILLUSTRATION
 

Information:

Engine News
Change Made To Installation Procedure For 3N5620 Service Disconnect Spacer Group
1982/09/22
Specifications
Front Accessory Drive
D379B, D398B, D399 GENERATOR SET ENGINES
Disassembly and Assembly
Accessory Drive Housing
D379B, D398B & D399 GENRERATOR SET ENGINES
Accessory Drive Gears
D379B, D398B & D399 GENRERATOR SET ENGINES

Caterpillar Parts SIS Catalog D379B :

DAMPER GP
3N-6355 DAMPER GP
CAMSHAFT GP
4L-8788 CAMSHAFT GP
CAMSHAFT GP
4L-8788 CAMSHAFT GP
PISTON & ROD GP
6L-2868 PISTON & ROD GP
SEAL GP-CRANKSHAFT CONVERSION
4W-2570 SEAL GP-CRANKSHAFT CONVERSION
SEAL GP-CRANKSHAFT CONVERSION
4W-2569 SEAL GP-CRANKSHAFT CONVERSION
SEAL GP-CRANKSHAFT CONVERSION
4W-2571 SEAL GP-CRANKSHAFT CONVERSION
SEAL GP-CRANKSHAFT CONVERSION
4W-2568 SEAL GP-CRANKSHAFT CONVERSION
DRIVE GP-AUXILIARY
6L-2120 DRIVE GP-AUXILIARY
CYLINDER HEAD GP
3N-2680 CYLINDER HEAD GP
CYLINDER HEAD GP
3N-2680 CYLINDER HEAD GP
CYLINDER HEAD GP
3N-2680 CYLINDER HEAD GP
CYLINDER HEAD GP
3N-2680 CYLINDER HEAD GP
CYLINDER HEAD GP
3N-2680 CYLINDER HEAD GP
CYLINDER HEAD GP
3N-2680 CYLINDER HEAD GP
CYLINDER HEAD GP
5N-8882 CYLINDER HEAD GP

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