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4P-9251 COVER GP-VALVE MECHANISM 3408B MARINE ENGINE


BASIC ENGINE
VALVE MECHANISM GP
CRANKSHAFT GP
CYLINDER BLOCK GP
CYLINDER HEAD GP

MARINE ENGINE 3408B MARINE ENGINE 8RG
 3408B High Performance Marine Engine 8RG00001-00107 SEBP2025 3408B 8RG   (1992)

BASIC ENGINE

VALVE MECHANISM GP
COVER GP-VALVE MECHANISM
4P-9251 COVER GP-VALVE MECHANISM
COVER GP-VALVE MECHANISM
6I-0367 COVER GP-VALVE MECHANISM
ROCKER ARM GP
4N-1718 ROCKER ARM GP
VALVE MECHANISM GP
4N-4298 VALVE MECHANISM GP
 

#SEBP20250010
 

4P-9251: COVER GP-VALVE MECHANISM

4P-9251 COVER GP-VALVE MECHANISM
i00372505 SEBP2025
4P9251 COVER GP-VALVE MECHANISM Parts scheme
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Parts for your 3408B MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 9L-8925 [38] BOLT (5/16-18X1.25-IN)  
2. 7C-6514 [3] ADAPTER  
  272-2583 [3] SEAL-O-RING  
3. 4W-6822 [2] BASE-COVER  
4. 7C-9635 [2] COVER-ROCKER ARM  
5. 5P-5678 BD SEAL  
6. 6N-2206 [1] CAP AS-FILLER  
7. 7N-6868 [1] TUBE  
8. 2N-8109 [1] CLAMP  
9. 4F-7390 [1] SEAL-O-RING  
  B   USE AS REQUIRED
  D   ORDER BY THE METER
 

#SEBP20250011
 

6I-0367: COVER GP-VALVE MECHANISM

6I-0367 COVER GP-VALVE MECHANISM
i00389565 SEBP2025
6I0367 COVER GP-VALVE MECHANISM Parts scheme
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Parts for your 3408B MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 9L-8925 [37] BOLT (5/16-18X1.25-IN)  
2. 7C-6514 [3] ADAPTER  
  272-2583 [3] SEAL-O-RING  
3. 4W-6822 [2] BASE-COVER  
4. 7C-9635 [2] COVER-ROCKER ARM  
5. 5P-5678 BD SEAL  
6. 6N-2206 [1] CAP AS-FILLER  
7. 7N-6868 [1] TUBE  
8. 2N-8109 [1] CLAMP  
9. 4F-7390 [1] SEAL-O-RING  
  B   USE AS REQUIRED
  D   ORDER BY THE METER
 

#SEBP20250012
 

1W-5009: CRANKSHAFT AS

1W-5009 CRANKSHAFT AS
PART OF 1W-5010 CRANKSHAFT GP
i00093383 SEBP2025
1W5009 CRANKSHAFT AS Parts scheme
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Parts for your 3408B MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 4N-0684 [1] DOWEL  
2. 8T-6757 [5] PLUG-PIPE  
3. 7S-5005 [1] DOWEL  
4. 7N-7591 [1] GEAR-CRANKSHAFT (80-TEETH)  
 

#SEBP20250013
 

1W-5010: CRANKSHAFT GP

1W-5010 CRANKSHAFT GP
i00093384 SEBP2025
1W5010 CRANKSHAFT GP Parts scheme
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Parts for your 3408B MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 1W-5009 Y [1] CRANKSHAFT AS  
2. 317-8766 [5] BEARING-MAIN (STANDARD)  
  4W-5698 AB BEARING-MAIN (0.63-MM US)  
  4W-5699 AB BEARING-MAIN (1.27-MM US)  
  4W-5700 AB BEARING-MAIN (0.63-MM OS)  
  4W-5701 AB BEARING-MAIN (0.63-MM OS, 0.63-MM US)  
3. 253-1752 C [2] PLATE-THRUST  
4. 319-7401 Y [1] SEAL GP-CRANKSHAFT (FRONT)  
5. 319-0785 Y [1] SEAL GP-CRANKSHAFT (REAR)(FLYWHEEL HOUSING)  
  A   NOT PART OF THIS GROUP
  B   USE AS REQUIRED
  C   CHANGE FROM PREVIOUS TYPE
  R   REMANUFACTURED PART MAY BE AVAILABLE
  Y   SEPARATE ILLUSTRATION
 

#SEBP20250014
 

4P-9959: CYLINDER BLOCK AS

4P-9959 CYLINDER BLOCK AS
PART OF 4P-7754 CYLINDER BLOCK GP
FIELD REPLACEMENT ORDER @@@@@ 4P-2566@@@@@
i00374281 SEBP2025
4P9959 CYLINDER BLOCK AS Parts scheme
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Parts for your 3408B MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 4N-0614 [5] CAP-CRANKSHAFT BEARING  
2. 3P-1323 [10] BOLT-BEARING CAP (7/8-14X7.75-IN)  
  9H-1031 [10] WASHER-HARD (24X41.5X6-MM THK)  
3. 4N-6658 [2] BUSHING (1.3-IN WIDE)  
4. 4N-0685 [3] BUSHING (1-IN WIDE)  
5. 7W-6492 [2] PLUG-PIPE (1/2-14-THD)  
6. 9L-5854 [8] BAND-FILLER (130.2-MM ID)  
7. 2W-6000 [8] LINER-CYLINDER BLOCK  
8. 110-2220 [24] SEAL-LINER  
 

#SEBP20250015
 

4P-2566: CYLINDER BLOCK GP

4P-2566 CYLINDER BLOCK GP
FIELD REPLACEMENT FOR @@@@@ 4P-9959@@@@@
i00374743 SEBP2025
4P2566 CYLINDER BLOCK GP Parts scheme
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Parts for your 3408B MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 7W-6534 [6] PLUG-PIPE  
2. 9S-4190 [4] PLUG-O-RING (7/8-14-THD)  
  114-4427 [4] SEAL-O-RING  
3. 8T-6757 [7] PLUG-PIPE  
4. 7W-6492 [2] PLUG-PIPE (1/2-14-THD)  
5. 4N-6658 [2] BUSHING (1.3-IN WIDE)  
6. 3S-6605 [2] PLUG-CUP  
7. 4N-0685 [3] BUSHING (1-IN WIDE)  
8. 3B-0645 [1] PLUG-CUP  
9. 7E-6479 [8] BOLT-SPECIAL (OIL JET)  
10. 119-2294 [8] JET AS-PISTON COOLING  
11. 7C-9614 [3] PLUG-TAPERLOCK (1-5/8-12-THD)  
12. 8T-6763 [4] PLUG-PIPE (1/4-18-THD)  
13. 4N-5858 [5] CAP (CRANKSHAFT BEARING)  
14. 3P-1323 [10] BOLT-BEARING CAP (7/8-14X7.75-IN)  
  9H-1031 [10] WASHER-HARD (24X41.5X6-MM THK)  
15. 8T-6764 [1] PLUG-PIPE (1/8-27-THD)  
 

#SEBP20250016
 

4P-7754: CYLINDER BLOCK GP

4P-7754 CYLINDER BLOCK GP
i00371097 SEBP2025
4P7754 CYLINDER BLOCK GP Parts scheme
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Parts for your 3408B MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 119-2294 [8] JET AS-PISTON COOLING  
2. 4N-1650 [4] DOWEL  
3. 8T-6763 [4] PLUG-PIPE (1/4-18-THD)  
4. 4P-9959 Y [1] CYLINDER BLOCK AS  
5. 8T-6757 [7] PLUG-PIPE  
6. 6N-9133 [2] GASKET-PLATE  
7. 6I-4613 [2] PLATE-SPACER  
8. 7C-9614 [3] PLUG-TAPERLOCK (1-5/8-12-THD)  
9. 4N-0683 [4] DOWEL  
10. 7E-6479 [8] BOLT-SPECIAL (OIL JET)  
12. 7C-7407 [1] STUD  
13. 114-4427 [4] SEAL-O-RING  
14. 7W-6534 [6] PLUG-PIPE  
15. 8M-8283 [2] SEAL-O-RING  
16. 3S-6605 [2] PLUG-CUP  
17. 9S-4190 [4] PLUG-O-RING (7/8-14-THD)  
18. 8T-6764 [1] PLUG-PIPE (1/8-27-THD)  
19. 6L-4428 [3] STUD-TAPERLOCK (3/8-16X4.01-IN)  
  Y   SEPARATE ILLUSTRATION
 

#SEBP20250017
 

105-3788: CYLINDER HEAD AS

105-3788 CYLINDER HEAD AS
PART OF 7W-2224 CYLINDER HEAD GP
FIELD REPLACEMENT ORDER @@@@@ 7W-2225@@@@@
i00093513 SEBP2025
1053788 CYLINDER HEAD AS Parts scheme
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Parts for your 3408B MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 3B-0645 [6] PLUG-CUP  
2. 4N-5893 [8] INSERT-VALVE SEAT (INLET)(STANDARD)  
  7C-7602 AB INSERT-VALVE SEAT (0.13-MM OS, INLET)  
  7C-7603 AB INSERT-VALVE SEAT (0.25-MM OS, INLET)  
  7C-7604 AB INSERT-VALVE SEAT (0.51-MM OS, INLET)  
  7C-7605 AB INSERT-VALVE SEAT (0.76-MM OS, INLET)  
3. 1W-5283 [8] INSERT-VALVE SEAT (EXHAUST)(STANDARD)  
  7C-5353 AB INSERT-VALVE SEAT (0.51-MM OS, EXHAUST)  
  7C-5354 AB INSERT-VALVE SEAT (0.76-MM OS, EXHAUST)  
4. 3B-0623 [8] PLUG-CUP  
  A   NOT PART OF THIS GROUP
  B   USE AS REQUIRED
 

#SEBP20250018
 

143-0040: CYLINDER HEAD AS

143-0040 CYLINDER HEAD AS
PART OF 7W-2225 CYLINDER HEAD AS
i00566895 SEBP2025
1430040 CYLINDER HEAD AS Parts scheme
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Parts for your 3408B MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 3B-0645 [6] PLUG-CUP  
2. 4N-5893 [8] INSERT-VALVE SEAT (INLET)(STANDARD)  
  7C-7602 AB INSERT-VALVE SEAT (0.13-MM OS, INLET)  
  7C-7603 AB INSERT-VALVE SEAT (0.25-MM OS, INLET)  
  7C-7604 AB INSERT-VALVE SEAT (0.51-MM OS, INLET)  
  7C-7605 AB INSERT-VALVE SEAT (0.76-MM OS, INLET)  
3. 1W-5283 [8] INSERT-VALVE SEAT (EXHAUST)(STANDARD)  
  7C-5353 AB INSERT-VALVE SEAT (0.51-MM OS, EXHAUST)  
  7C-5354 AB INSERT-VALVE SEAT (0.76-MM OS, EXHAUST)  
4. 3B-0623 [8] PLUG-CUP  
  A   NOT PART OF THIS GROUP
  B   USE AS REQUIRED
 

#SEBP20250019
 

7W-2223: CYLINDER HEAD AS

7W-2223 CYLINDER HEAD AS
PART OF 7W-2224 CYLINDER HEAD GP
FIELD REPLACEMENT ORDER @@@@@ 7W-2225@@@@@
i00108210 SEBP2025
7W2223 CYLINDER HEAD AS Parts scheme
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Parts for your 3408B MARINE ENGINE:

CATERPILLAR SIS
Pos. Part No Qty Parts name Comments
1. 3B-0645 [6] PLUG-CUP  
2. 4N-5893 [8] INSERT-VALVE SEAT (INLET)(STANDARD)  
  7C-7602 ABF INSERT-VALVE SEAT (0.13-MM OS, INLET)  
  7C-7603 ABF INSERT-VALVE SEAT (0.25-MM OS, INLET)  
  7C-7604 ABF INSERT-VALVE SEAT (0.51-MM OS, INLET)  
  7C-7605 ABF INSERT-VALVE SEAT (0.76-MM OS, INLET)  
3. 1W-5283 [8] INSERT-VALVE SEAT (EXHAUST)(STANDARD)  
  7C-5353 ABF INSERT-VALVE SEAT (0.51-MM OS, EXHAUST)  
  7C-5354 ABF INSERT-VALVE SEAT (0.76-MM OS, EXHAUST)  
4. 3B-0623 [8] PLUG-CUP  
  A   NOT PART OF THIS GROUP
  B   USE AS REQUIRED
  F   NOT SHOWN
 

Information:

Engine News
Use Caution During Replacement Of Damaged Nozzle Adapters Or Precombustion Chambers
1983/01/19
Engine Valve Stem "Use Again" Specifications
1983/03/16
New High Alloy Material Is Used In Cylinder Head Assemblies
1984/10/24
A New Book "Analyzing Diesel And Natural Gas Engine Valve Failures" Is Available
1985/03/01
Valve Lash Adjustment Interval Is Changed
1986/07/01
Salvage Of Cylinder Heads By Using Oversized Valve Guides And Valve Inserts
1987/04/01
Improved Head Gasket Used; Service Tips
1990/03/01
New Exhaust Valves Are Used In Caterpillar Remanufactured Cylinder Heads
1990/10/01
Cylinder Head Gaskets Improved To Provide Better Fire Ring Retention{1124}
1994/02/01
Identification Of Intake And Exhaust Valves That May Be Used In Remanufactured Direct Injected 3400 Cylinder Heads{1105}
1994/04/18
New Rocker Arm Adjustment Screw Used To Adjust Valve Clearance {1123,1100}
1994/06/01
New Valve Lifter Assembly Provides Improved Lubrication Of Lifter Roller And Camshaft Lobes {1209,1210}
1994/06/01
New Inlet And Exhaust Valves Have Thinner Heads{1105}
1995/02/01
Valve Lash Adjustment Intervals{1105}
1995/08/01
New And Reconditioned Valve Projection Specifications{1105}
1995/09/01
Be Sure To Use The Correct Inlet And Exhaust Valves In Engines Equipped With Valve Bridges That Do Not Ride On Dowels{1105,1121}
1998/03/01
New 5P4185 Fuel Pump Timing Pin To Be Used Only On 3408 And 3412 Engines
1977/05/13
Correct Installation Of Valve Lifters On The Camshaft Is Very Important To Prevent Failures
1977/05/25
5P7333 Tool Group Available For The Repair Of Loose Bridge Dowels On Cylinder Heads
1977/06/29
Tolerance Added To Valve Clearance Specifications
1978/01/18
Use Again Specifications For Valve Springs Are Changed
1978/03/01
5P8700 Lifting Brackets Permit Cylinder Head Assembly To Be Removed And Installed
1978/07/05
Cat<SUP>&reg;</SUP> Reman Has Added Valve Lifters, Rocker Arms, and Camshafts for Certain Engines and Generator Set Engines {1123, 1130, 1209, 1210}
2014/09/05
Operation and Maintenance Manual
Engine Valve Rotators - Inspect
3408C, 3412, 3412C, and 3412D High Performance Marine Engines
Engine Valve Lash - Inspect/Adjust
3408C, 3412, 3412C, and 3412D High Performance Marine Engines
Special Instruction
Replacement For The 2M4314 Fuel Pump Bonnet Retaining Bushing{1250}
Replacement For The 2M4314 Fuel Pump Bonnet Retaining Bushing{1250}
Use Of The 5P7333 Tool Group For Bridge Dowel Repair{1101}
Use Of The 5P7333 Tool Group For Bridge Dowel Repair{1101}
Use Of The 1P7451 Valve Guide Honing Group{0673, 1104}
Use Of The 1P7451 Valve Guide Honing Group{0673, 1104}
Installing Heli-Coil Inserts In Caterpillar Cylinder Heads{1117}
Installing Heli-Coil Inserts In Caterpillar Cylinder Heads{1117}
Use Of 6V4805 Valve Seat Insert Puller Group{0703}
Use Of 6V4805 Valve Seat Insert Puller Group{0703}
Repair Of Precombustion Chamber And Direct Injection Adapter Seating Surfaces{1101}
Repair Of Precombustion Chamber And Direct Injection Adapter Seating Surfaces{1101}
Use Of 6V9050 Exhaust Stud Removal Group{1100}
Use Of 6V9050 Exhaust Stud Removal Group{1100}
Specifications
Valve Mechanism Cover
3408C, 3412C and 3412D High Performance Marine Engines
Valve Rocker Arms, Lifters, and Bridges
3408C, 3412C and 3412D High Performance Marine Engines
Reuse And Salvage Guidelines
Reuse & Salvage for Valvetrain Components {1102, 1108, 1109, 1121, 1123}
Reuse & Salvage for Valvetrain Components {1102, 1108, 1109, 1121, 1123}
Information Release Memo
APPEARANCE CHANGE ON REMAN SHORT BLOCKS
APPEARANCE CHANGE ON REMAN SHORT BLOCKS
Testing and Adjusting
Engine Valve Lash - Inspect/Adjust
3408C, 3412C and 3412D High Performance Marine Engines
Finding Top Center Position for No. 1 Piston
3408C, 3412C and 3412D High Performance Marine Engines
Disassembly and Assembly
Valve Covers
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES
Rocker Shaft Assembly
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES
Valve Lifters &amp; Push Rods
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES
Valves
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES
Valve Guides
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES
Bridge Dowels
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES
Valve Seat Inserts
3408 & 3412 HIGH PERFORMANCE MARINE ENGINES
Service Magazine
Engine Valve Stem &quot;Use Again&quot; Specifications{0653,1105}
1983/02/28
Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures{1105,1208}
1983/10/17
Remanufactured Cylinder Head Groups{1100,1101,7554}
1984/11/19
Valve Lash Adjustment Not A Warranty Item {1102,1105}
1985/01/14
Maximum Wear Limits Established For Camshaft Roller Followers{1209}
1985/09/30
Valve Lash Adjustment Interval Is Changed {1105}
1986/07/07
Correct Installation Of Valve Lifters On The Camshaft Is Very Important To Prevent Failures{1209}
1977/05/16
5P7333 Tool Group Available For The Repair Of Loose Bridge Dowels On Cylinder Heads{0663,1101}
1977/06/20
Tools Now Available To Ream And/Or Hone 0.500&quot; (12.70 mm) Diameter Valve Guides{0663}
1977/08/22
Tolerance Added To Valve Clearance Specifications{1105,0374}
1978/01/16
Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures{1105,1208}
1978/01/30
Use Again Specifications For Valve Springs Are Changed{1108}
1978/03/06
A New Method To Clean And Polish Engine Valve Stems{0674,1105}
1979/05/28
Why Engines Are Damaged By Fuel Sulfur{1104,1216,1280,1318,1215}
1979/08/27
Fuel Sulfur-Your Diesel's Silent Enemy{0375,1280}
1979/12/17
Improved Head Gasket Used; Service Tips {1124,1216,1221,7568}
1990/02/26
New Exhaust Valves Are Used In Caterpillar Remanufactured Cylinder Heads{1105,1101}
1990/10/08

Caterpillar Parts SIS Catalog 3408B :

COVER GP-OIL PAN
6I-1813 COVER GP-OIL PAN
COVER GP-FRONT HOUSING
4N-6798 COVER GP-FRONT HOUSING
COVER GP-FLYWHEEL HOUSING
4N-1902 COVER GP-FLYWHEEL HOUSING
COVER GP-CYLINDER BLOCK
6I-2956 COVER GP-CYLINDER BLOCK
COVER GP-CYLINDER BLOCK
4P-7763 COVER GP-CYLINDER BLOCK
CAMSHAFT GP
4N-0963 CAMSHAFT GP
BALANCER GP
4N-1092 BALANCER GP
4P-7027 ENGINE AR
COVER GP-VALVE MECHANISM
6I-0367 COVER GP-VALVE MECHANISM
CRANKSHAFT AS
1W-5009 CRANKSHAFT AS
CRANKSHAFT GP
1W-5010 CRANKSHAFT GP
CYLINDER BLOCK AS
4P-9959 CYLINDER BLOCK AS
CYLINDER BLOCK GP
4P-2566 CYLINDER BLOCK GP
CYLINDER BLOCK GP
4P-7754 CYLINDER BLOCK GP
CYLINDER HEAD AS
105-3788 CYLINDER HEAD AS
CYLINDER HEAD AS
143-0040 CYLINDER HEAD AS

Truck sale:

1986 CAT 3408B
USD $34,000 
1986 CAT 3408B

Empire Power Systems
PHOENIX, Arizona
CAT 3408B
USD $9,228 
CAT 3408B

The Dutch Engine and Pump Company BV
Ridderkerk, The Netherlands
CAT 3408B
Call 
CAT 3408B

Coastal Power & Equipment
Texas
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