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420-0668 KIT-FRONT COVER GASKET CONTAINS GASKETS, SEALS, & BENDABLE LOCKS TO REINSTALL THE FRONT COVER. THIS KIT DOES NOT INCLUDE THE OIL PAN GASKET PART OF 421-9719, 436-1747 KIT-ENGINE OVERHAUL FIELD INSTALLATION 3412


SERVICE EQUIPMENT AND SUPPLIES
GASKET & SEAL KITS
BASIC ENGINE
LIFTING GP-ENGINE
MOUNTING GP-ALTERNATOR
PAN GP-OIL
PISTON & ROD GP
PULLEY GP
VALVE MECHANISM GP
MOUNTING GP-ENGINE


SERVICE EQUIPMENT AND SUPPLIES

GASKET & SEAL KITS
 

#SEBP20260050
 

420-0668: KIT-FRONT COVER GASKET

420-0668 KIT-FRONT COVER GASKET
CONTAINS GASKETS, SEALS, & BENDABLE LOCKS TO REINSTALL THE FRONT COVER. THIS KIT DOES NOT INCLUDE THE OIL PAN GASKET
PART OF 421-9719, 436-1747 KIT-ENGINE OVERHAUL
FIELD INSTALLATION
i05215174 SEBP2026
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Parts for your 3412 MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 198-1517 [1] GASKET  
2. 6N-2508 [1] GASKET  
3. 7W-5648 [1] GASKET (ACCESSORY DRIVE)  
4. 8B-6283 [1] GASKET  
5. 193-9155 [1] GASKET  
6. 166-9145 [1] GASKET-CYLINDER BLOCK  
7. 142-5867 [1] SEAL-CRANKSHAFT (FRONT)  
8. 2M-9780 [1] SEAL-O-RING  
9. 3J-7354 [1] SEAL-O-RING  
10. 4S-5898 [1] SEAL-O-RING  
11. 8T-9527 [1] SEAL-O-RING  
12. 467-2620 [1] SEAL-O-RING  
13. 112-1580 [1] SEAL-O-RING  
14. 214-7568 [1] SEAL-O-RING  
   
    FOR A LIST OF RELATED PARTS THAT MAY BE REQUIRED FOR THE ENGINE REBUILD IN ADDITION TO THE KIT CONSIST, PLEASE VISIT:
   
    HTTPS://DEALER.CAT.COM/RELATED
 

#SEBP20260051
 

7E-1123: LIFTING GP-ENGINE

7E-1123 LIFTING GP-ENGINE
i00398352 SEBP2026
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Parts for your 3412 MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 7E-1125 [1] EYE-LIFTING (FRONT)  
2. 101-0147 [1] EYE-LIFTING  
3. 0S-1585 [6] BOLT (1/2-13X1.5-IN)  
4. 5P-8245 [10] WASHER-HARD (13.5X25.5X3-MM THK)  
5. 0T-0065 [1] BOLT (3/8-16X3.5-IN)  
6. 5M-2894 [3] WASHER-HARD (10.2X18.5X2.5-MM THK)  
7. 9S-8752 [2] NUT-FULL (3/8-16-THD)  
8. 2H-6488 B [2] BOLT (1/2-13X5-IN)  
9. 8F-8804 [2] BOLT (1/2-13X5.75-IN)  
10. 1F-7958 [2] NUT-FULL (1/2-13-THD)  
11. 0S-1595 [2] BOLT (1/2-13X1.25-IN)  
12. 0S-1587 [2] BOLT (1/2-13X1.75-IN)  
  B   USE AS REQUIRED
 

#SEBP20260052
 

129-8138: MOUNTING GP-ALTERNATOR

129-8138 MOUNTING GP-ALTERNATOR
AN ATTACHMENT
i00498323 SEBP2026
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Parts for your 3412 MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 4W-4640 [1] PLATE  
2. 0S-1588 [1] BOLT (3/8-16X1.25-IN)  
3. 5M-2894 [4] WASHER-HARD (10.2X18.5X2.5-MM THK)  
4. 8S-9191 [2] BOLT (3/8-16X4-IN)  
5. 1F-7958 [1] NUT-FULL (1/2-13-THD)  
6. 5P-8247 [1] WASHER-HARD (17X32X3.5-MM THK)  
7. 4K-0367 [3] NUT-FULL (5/8-11-THD)  
8. 8S-5383 [1] BLOCK  
9. 4S-5780 [1] ROD  
10. 9L-6639 [1] V-BELT (ALTERNATOR)  
11. 9X-8883 [1] BOLT (5/8-11X2.75-IN)  
12. 5P-8245 [8] WASHER-HARD (13.5X25.5X3-MM THK)  
13. 9X-8873 [1] BOLT (1/2-13X2.25-IN)  
14. 4N-8225 [1] PULLEY-ALTERNATOR (1-GROOVE)  
15. 129-8139 [1] BRACKET AS  
16. 0S-1587 [4] BOLT (1/2-13X1.75-IN)  
17. 9H-8260 [1] BOLT (1/2-13X6.25-IN)  
18. 2S-5658 [2] WASHER-HARD (17X29X3-MM THK)  
19. 7G-9726 [1] SPACER (17X28X16-MM THK)  
 

#SEBP20260053
 

6I-1866: MOUNTING GP-ALTERNATOR

6I-1866 MOUNTING GP-ALTERNATOR
REQUIRED WITH AN ALTERNATOR
FOR USE WITH SEAWATER PUMP
AN ATTACHMENT
i00392943 SEBP2026
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Parts for your 3412 MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 6I-1876 [1] BRACKET AS  
2. 8S-5383 [1] BLOCK  
3. 7X-0448 [2] NUT (5/8-11-THD)  
4. 7X-0513 [2] WASHER-HARD (17X30X5-MM THK)  
5. 6I-1867 [1] SUPPORT-ALTERNATOR  
6. 3B-1915 [3] BOLT (3/8-16X1.375-IN)  
7. 5M-2894 [6] WASHER-HARD (10.2X18.5X2.5-MM THK)  
8. 7N-4460 [1] BRACKET  
9. 8T-4835 [1] BOLT (1/2-13X2-IN)  
10. 8T-4122 [1] WASHER-HARD (17X32X3.5-MM THK)  
11. 7X-0341 [1] BOLT (1/2-13X7-IN)  
12. 6V-8188 [1] NUT (1/2-13-THD)  
13. 8T-4223 [3] WASHER-HARD (13.5X25.5X3-MM THK)  
14. 4N-8225 [1] PULLEY-ALTERNATOR (1-GROOVE)  
15. 9L-6639 [1] V-BELT (ALTERNATOR)  
16. 140-6329 [1] SPACER (14.3X25.4X33.3-MM THK)  
17. 0S-1590 [1] BOLT (3/8-16X2-IN)  
18. 1A-5964 [2] BOLT (3/8-16X4.5-IN)  
19. 7X-0346 [1] BOLT (5/8-11X2-IN)  
20. 8T-7971 [1] WASHER-HARD (13.5X25.5X5-MM THK)  
 

#SEBP20260054
 

4N-2647: PAN GP-OIL

4N-2647 PAN GP-OIL -ENGINE
i00108676 SEBP2026
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Parts for your 3412 MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 2P-3203 C [40] BOLT-WASHER HEAD (3/8-16X1.25-IN)  
2. 6N-1396 [1] GASKET-OIL PAN  
3. 9Y-9635 [1] PAN-OIL  
4. 8T-6761 C [3] PLUG-PIPE (1-11-1/2 NPT THD)(OIL PAN)  
  C   CHANGE FROM PREVIOUS TYPE
 

#SEBP20260055
 

4P-7472: PISTON & ROD GP

4P-7472 PISTON & ROD GP
14.1:1 RATIO
i00385232 SEBP2026
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Parts for your 3412 MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 112-2876 N [1] BODY AS-PISTON  
2. 8N-1608 [1] PIN-PISTON  
3. 7E-5665 N [2] RETAINER-PIN  
4. 8N-1728 [1] ROD AS-CONNECTING  
4A. 4P-8495 N [1] BUSHING  
4B. 8L-3441 [2] NUT (9/16-18-THD)  
4C. 6N-8942 [2] BOLT-CONNECTING ROD  
5. 9Y-9497 H [1] BEARING-CONNECTING ROD (STANDARD)  
  4W-5702 ABJ BEARING-CONNECTING ROD (0.635-MM US)  
  4W-5703 ABL BEARING-CONNECTING ROD (1.27-MM US)  
6. 1W-9460 N [1] RING-PISTON (TOP)  
7. 2P-2817 N [1] RING-PISTON (INTERMEDIATE)  
8. 7N-7078 N [1] RING-PISTON (OIL CONTROL)  
9. 168-4538 [1] JET AS-PISTON COOLING  
10. 150-1156 [1] BOLT-SPECIAL (OIL JET)  
   
    AVAILABLE REPAIR KIT(S):
  9Y-6188 ABHPS KIT-ROD BEARING (STANDARD)  
  9Y-6189 ABJPS KIT-ROD BEARING (0.635-MM US)  
  9Y-6190 ABLPS KIT-ROD BEARING (1.27-MM US)  
  442-5354 ABN [1] KIT-CYLINDER PACK  
    (INCLUDES RINGS, BUSHING, PISTON BODY ASSEMBLY, RETAINER, LINER, SINGLE CYLINDER LINER GASKET KIT)
  A   NOT PART OF THIS GROUP
  B   USE AS REQUIRED
  H   KIT MARKED H INCLUDES SIX OF PART MARKED H
  J   KIT MARKED J INCLUDES SIX OF PART MARKED J
  L   KIT MARKED L INCLUDES SIX OF PART MARKED L
  N   KIT MARKED N SERVICES PART(S) MARKED N
  P   QTY OF 2 KITS REQUIRED FOR 3412 ENGINE
  R   REMANUFACTURED PART MAY BE AVAILABLE
  S   NOT FOR USE WITH 3408
 

#SEBP20260056
 

6N-4581: PULLEY GP-CRANKSHAFT

6N-4581 PULLEY GP-CRANKSHAFT
CANNOT BE USED WITH FRONT ENCLOSED CLUTCH
AN ATTACHMENT
i00974059 SEBP2026
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Parts for your 3412 MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 6N-4580 [1] PULLEY (2-GROOVE)  
2. 0L-1351 [8] BOLT (3/8-16X0.875-IN)  
 

#SEBP20260057
 

7W-5926: ROCKER ARM GP

7W-5926 ROCKER ARM GP
PART OF 4N-7352 VALVE MECHANISM GP
i00108870 SEBP2026
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Parts for your 3412 MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 4N-5614 [6] ROCKER ARM AS  
2. 4N-1108 [1] SHAFT AS-ROCKER ARM  
  0L-1022 [2] PLUG-CUP  
3. 9Y-4384 [2] BRACKET-SHAFT  
4. 2N-7229 [2] SPRING  
5. 108-5603 [6] SCREW (3/8-24X1.67-IN)  
6. 4N-0955 [2] DOWEL  
7. 2N-7228 B [2] WASHER (1X1.5X0.03-IN THK)  
8. 006-7403 [2] RING-RETAINING  
9. 9L-7712 [6] NUT (3/8-24-THD)  
10. 9Y-4385 [1] BRACKET AS  
  2D-6642 [1] BALL  
  4B-9880 [1] BALL  
11. 2N-7228 [2] WASHER (1X1.5X0.03-IN THK)  
  B   USE AS REQUIRED
  R   REMANUFACTURED PART MAY BE AVAILABLE
 

#SEBP20260058
 

7W-5927: ROCKER ARM GP

7W-5927 ROCKER ARM GP
PART OF 4N-7352 VALVE MECHANISM GP
i00108871 SEBP2026
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Parts for your 3412 MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 4N-5614 [6] ROCKER ARM AS  
2. 4N-1108 [1] SHAFT AS-ROCKER ARM  
  0L-1022 [2] PLUG-CUP  
3. 9Y-4384 [2] BRACKET-SHAFT  
4. 2N-7229 [2] SPRING  
5. 108-5603 [6] SCREW (3/8-24X1.67-IN)  
6. 4N-0955 [2] DOWEL  
7. 2N-7228 B [2] WASHER (1X1.5X0.03-IN THK)  
8. 006-7403 [2] RING-RETAINING  
9. 9L-7712 [6] NUT (3/8-24-THD)  
10. 9Y-4385 [1] BRACKET AS  
  2D-6642 [1] BALL  
  4B-9880 [1] BALL  
11. 2N-7228 [2] WASHER (1X1.5X0.03-IN THK)  
  B   USE AS REQUIRED
  R   REMANUFACTURED PART MAY BE AVAILABLE
 

#SEBP20260059
 

7E-0128: SUPPORT GP-ENGINE

7E-0128 SUPPORT GP-ENGINE
i00395843 SEBP2026
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Parts for your 3412 MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 7E-0115 [1] SUPPORT AS  
2. 1D-4569 [8] BOLT (1/2-13X4.25-IN)  
  2M-0849 [8] WASHER-HARD (13.5X25.5X5-MM THK)  
3. 8T-4162 [2] SETSCREW (3/4-10X4.5-IN)  
4. 2J-3506 [2] NUT-FULL (3/4-10-THD)  
 

Information:

Engine News
Gasket Kits
1982/02/10
A New Exhaust Gasket is Now Available {1059}
A New Exhaust Gasket is Now Available {1059}
Special Instruction
Installing Crankshaft Seals And Wear Sleeves Using The Former 9S8868, 9S8873, 9S8881 And 9S8888 Tools Groups{1160, 1161, 0704}
Installing Crankshaft Seals And Wear Sleeves Using The Former 9S8868, 9S8873, 9S8881 And 9S8888 Tools Groups{1160, 1161, 0704}
Installation Of Crankshaft Seals And Wear Sleeves{1160, 1161}
Installation Of Crankshaft Seals And Wear Sleeves{1160, 1161}
Installation Of Crankshaft Seals And Wear Sleeves{1203}
Installation Of Crankshaft Seals And Wear Sleeves{1203}
Crankshaft Seal And Wear Sleeve Installation{1160, 1161}
Crankshaft Seal And Wear Sleeve Installation{1160, 1161}
Installation Of Seal Groups With Hydrodynamic Grooves In The Seal Lip{1160, 1161}
Installation Of Seal Groups With Hydrodynamic Grooves In The Seal Lip{1160, 1161}
Installation Instructions For The 160-9874 Gasket Kit {1213, 7555}
Installation Instructions For The 160-9874 Gasket Kit {1213, 7555}
Instructions for Installation of Oversize Hydraulic Cylinder Seals {7555, 7562}
Instructions for Installation of Oversize Hydraulic Cylinder Seals {7555, 7562}
Determining the Cause of Fuel Dilution of Engine Oil {1101, 1124, 1251, 1280, 1290}
Determining the Cause of Fuel Dilution of Engine Oil {1101, 1124, 1251, 1280, 1290}
Guideline for Proper Gasket Handling and Installation {0599, 0648, 0681, 1000, 7555}
Guideline for Proper Gasket Handling and Installation {0599, 0648, 0681, 1000, 7555}
Service Letter-NACD
Remove All 3E6777 Seals And 5P8057 Kits From Dealer Inventory
Remove All 3E6777 Seals And 5P8057 Kits From Dealer Inventory
Service Letter-Australia
Service Letter-CFEL
Service Letter-CSARL
Service Letter-Americas
Service Letter-Brazil
Service Letter-Truck/Ag/Marine
Service Letter-China
Service Letter-Asia
Reuse And Salvage Guidelines
Guideline for Proper Gasket Handling and Installation {0599, 0648, 0681, 1000, 7555}
Guideline for Proper Gasket Handling and Installation {0599, 0648, 0681, 1000, 7555}
Service Letter-APD
Remove All 3E6777 Seals And 5P8057 Kits From Dealer Inventory
Remove All 3E6777 Seals And 5P8057 Kits From Dealer Inventory
Service Magazine

Caterpillar Parts SIS Catalog 3412 :

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