- Engine:
- 3406C (S/N: 2WB1-UP)
- Generator Set:
- 3406B GEN SET (S/N: 2WB1-UP)
- 3406C MARINE GS (S/N: 4061-UP)
- Marine Engine:
- 3406C MARINE (S/N: 1SS1-UP)
Introduction
This Special Instruction is intended to provide information on the Engine Overhaul Kit Consist and detailed information on specific parts that should be used based on engine arrangements.
This Engine Overhaul Kit may contain extra parts and extra quantities due to the variety of engine arrangements assigned to a given kit. Refer to the corresponding Parts Manual or Disassembly and Assembly manual in Table 1.
Note: This Kit may contain upgraded parts. These upgraded part numbers may be different than what you have in the parts manual or engine, but these parts have been technically reviewed for compatibility with your application.
Note: This kit contains gasket kits and includes additional parts needed to perform an engine overhaul.
Note: This kit does not contain rod bearings, main bearings, and thrust plates.
Note: For assistance with technical questions, contact your local Cat dealer.
Note: For more information, visit us at catmarinesupport.com.
Note: For access to our website you can scan the QR code below with a QR enabled device.
Illustration 1 | g03319969 |
Reference Material
Engine Model     | Engine Arrangement     | Engine Serial Number Range     | Parts Book Media     | Disassembly and Assembly Media     |
3406C     | 177-8877     | S/N:1SS1-UP     | SEBP2520     | SENR1143     |
177-8874 | ||||
177-8878 | ||||
177-8879 | ||||
177-8880 | ||||
177-8876 | ||||
177-8873 | ||||
238-5347 | S/N:4061-UP     | SEBP3957     | SENR6526     | |
238-5343 | ||||
238-5345 | ||||
238-5349 | ||||
238-5342 | ||||
4P-1987 | S/N:2WB1-UP     | SEBP2753     | SENR3920     |
Note: For ordering reference material contact your local Cat dealer.
3406C 434-4988 Major Overhaul Kit Consist
434-4988 Major Overhaul Kit Consist     | ||
Gasket Kits     | ||
Part Number     | Part Name     | Qty     |
232-3679     | Rear Structure Gasket Kit     | 1     |
433-7712     | Fuel System Gasket Kit     | 1     |
433-7869     | Expansion Tank Gasket Kit     | 1     |
434-0877     | After Cooler and Lines Gasket Kit     | 1     |
434-1858     | Single Cylinder Head Gasket Kit     | 1     |
434-2402     | Front Structure Gasket Kit     | 1     |
434-4989     | Oil Cooler and Lines Gasket Kit     | 1     |
434-5056     | Central and Lower Structure Gasket Kit     | 1     |
Additional Parts Included in This Kit     | ||
Part Number     | Part Name     | Qty     |
1R-0749     | Fuel Filter     | 1     |
1R-1808     | Engine Oil Filter     | 1     |
2H-1193     | Ferrule     | 1     |
2N-2766     | Locknut     | 12     |
3G-2292     | Locking Bolt     | 5     |
4N-0685     | Bushing     | 6     |
4N-6658     | Bushing     | 1     |
4N-8150     | Spring     | 2     |
4S-6137     | Taperlock Stud     | 1     |
5M-2894     | Hard Washer     | 12     |
9Y-2988     | Breather As     | 1     |
100-7399     | Plug     | 2     |
106-1792     | Taperlock Stud     | 11     |
126-1756     | Locking Bolt     | 4     |
131-7123     | Bushing     | 1     |
248-5513     | Temperature Regulator     | 1     |
305-6843     | Guide Spring     | 12     |
321-8649     | Fluid Sampling Valve As     | 1     |
392-9208     | Valve Plunger     | 2     |
Note: For assistance or technical questions contact your local Cat dealer.
Note: Refer to Illustration 2 for location of gasket kits.
3406C Engine Gasket Kit Locations
Illustration 2 | g03406156 |
(1) Rear Structure ( 232-3679 Gasket Kit ) (2) Single Cylinder Head ( 434-1858 Gasket Kit ) (3) After Cooler and Lines ( 434-0877 Gasket Kit ) (4) Fuel System ( 433-7712 Gasket Kit ) (5) Expansion Tank ( 433-7869 Gasket Kit ) (6) Front Structure ( 434-2402 Gasket Kit ) (7) Central and Lower ( 434-5056 Gasket Kit ) (8) Oil Cooler and Lines ( 434-4989 Gasket Kit ) |
Gasket Kit Consists
Rear Structure (232-3679 Gasket Kit)
232-3679 Gasket Kit (Rear Structure)     | ||
Part Number     | Part Name     | Qty     |
2A-1162     | Gasket     | 1     |
2N-8359     | Gasket     | 1     |
4H-7869     | Gasket     | 1     |
4N-0933     | Gasket     | 2     |
5H-0244     | Gasket     | 1     |
9Y-6089     | Gasket     | 1     |
142-5868     | Crankshaft Seal     | 1     |
155-5619     | Gasket     | 1     |
230-3728     | O-Ring Seal     | 1     |
234-8937     | Integral Seal     | 1     |
Refer to Illustration 2.
Fuel System (433-7712 Gasket Kit)
433-7712 Gasket Kit (Fuel System)     | ||
Part Number     | Part Name     | Qty     |
1P-0436     | Gasket     | 1     |
1W-1186     | Gasket     | 1     |
2J-0157     | O-Ring Seal     | 1     |
2N-3350     | O-Ring Seal     | 1     |
3J-1907     | O-Ring Seal     | 1     |
3J-7354     | O-Ring Seal     | 3     |
4J-8997     | O-Ring Seal     | 1     |
4M-8303     | O-Ring Seal     | 2     |
5P-5846     | O-Ring Seal     | 1     |
5P-7813     | O-Ring Seal     | 2     |
6L-3528     | Gasket     | 1     |
6V-3319     | O-Ring Seal     | 1     |
7C-0307     | Gasket     | 1     |
8H-2778     | Ring Seal     | 1     |
8H-9204     | Felt Washer     | 6     |
8J-4351     | O-Ring Seal     | 2     |
8L-2779     | O-Ring Seal     | 6     |
109-3206     | O-Ring Seal     | 1     |
109-9685     | O-Ring Seal     | 1     |
117-1385     | O-Ring Seal     | 6     |
131-3719     | O-Ring Seal     | 6     |
144-0482     | Gasket     | 1     |
214-7566     | O-Ring Seal     | 1     |
214-7568     | O-Ring Seal     | 9     |
Refer to Illustration 2.
Expansion Tank (433-7869 Gasket Kit)
433-7869 Gasket Kit (Expansion Tank))     | ||
Part Number     | Part Name     | Qty     |
2N-0931     | Gasket     | 4     |
4L-7636     | Gasket     | 1     |
4N-1156     | Regulator Cover Gasket     | 1     |
4N-3858     | Gasket     | 1     |
7C-0307     | Gasket     | 1     |
109-0076     | O-Ring Seal     | 1     |
110-7753     | O-Ring Seal     | 2     |
Refer to Illustration 2.
Aftercooler and Lines (434-0877 Gasket Kit)
434-0877 Gasket Kit (Aftercooler and Lines)     | ||
Part Number     | Part Name     | Qty     |
1S-9544     | O-Ring Seal     | 2     |
2N-8204     | Gasket     | 6     |
4L-8337     | O-Ring Seal     | 2     |
4N-0699     | Gasket     | 1     |
4N-0933     | Gasket     | 2     |
4N-4159     | Gasket     | 1     |
4N-4188     | Gasket     | 2     |
5P-7204     | O-Ring Seal     | 4     |
5S-1188     | O-Ring Seal     | 2     |
6L-9589     | Gasket     | 4     |
6V-9769     | O-Ring Seal     | 4     |
109-0078     | O-Ring Seal     | 2     |
153-5484     | Gasket     | 2     |
Refer to Illustration 2.
Single Cylinder Head (434-1858 Gasket Kit)
434-1858 Gasket Kit (Single Cylinder Head)     | ||
Part Number     | Part Name     | Qty     |
1S-4810     | Oil Drain Gasket     | 1     |
1S-6595     | Oil Supply Gasket     | 1     |
2N-2766     | Locknut     | 4     |
2N-8204     | Gasket     | 6     |
3E-6772     | Seal     | 24     |
3S-5496     | O-Ring Seal     | 4     |
3S-9643     | Lip Type Seal     | 1     |
4L-8337     | O-Ring Seal     | 2     |
4N-0699     | Gasket     | 1     |
4N-4159     | Gasket     | 1     |
4N-7253     | Chamber Gasket     | 6     |
5P-5678     | Seal     | 10M     |
5S-1188     | O-Ring Seal     | 2     |
6I-2517     | Gasket     | 1     |
6I-3066     | Cylinder Head Gasket     | 1     |
6I-4024     | Plate Gasket     | 1     |
6L-8562     | Taperlock Stud     | 4     |
6L-9589     | Gasket     | 4     |
6V-3251     | O-Ring Seal     | 1     |
6V-3831     | O-Ring Seal     | 1     |
6V-9769     | O-Ring Seal     | 4     |
7C-0307     | Gasket     | 1     |
7L-4774     | O-Ring Seal     | 6     |
7M-7273     | Gasket     | 1     |
8C-5196     | O-Ring Seal     | 2     |
8H-9204     | Felt Washer     | 6     |
8L-2779     | O-Ring Seal     | 6     |
109-0072     | O-Ring Seal     | 2     |
109-0073     | O-Ring Seal     | 1     |
114-2687     | O-Ring Seal     | 1     |
114-4427     | O-Ring Seal     | 1     |
117-1385     | O-Ring Seal     | 6     |
129-9452     | Exhaust Manifold Gasket     | 6     |
214-7568     | O-Ring Seal     | 2     |
Refer to Illustration 2.
Front Structure (434-2402 Gasket Kit)
434-2402 Gasket Kit (Front Structure)     | ||
Part Number     | Part Name     | Qty     |
1H-7339     | O-Ring Seal     | 1     |
1W-1898     | Gasket     | 1     |
2W-0459     | Gasket     | 1     |
4H-6145     | Gasket     | 1     |
4N-0933     | Gasket     | 1     |
4W-0435     | Quad Ring Seal     | 1     |
4W-4616     | Quad Ring Seal     | 1     |
6B-2250     | Gasket     | 2     |
6V-3319     | O-Ring Seal     | 1     |
7W-5733     | Gasket     | 1     |
100-7432     | Gasket     | 1     |
109-0077     | O-Ring Seal     | 1     |
122-3772     | O-Ring Seal     | 1     |
142-5867     | Crankshaft Seal     | 1     |
147-0182     | O-Ring Seal     | 2     |
166-9142     | Gasket     | 1     |
166-9146     | Gasket     | 1     |
214-7566     | O-Ring Seal     | 1     |
230-3728     | O-Ring Seal     | 1     |
Refer to Illustration 2.
Oil Cooler and Lines (434-4989 Gasket Kit)
434-4989 Gasket Kit (Oil Cooler and Lines)     | ||
Part Name     | Part Number     | Qty     |
1W-2636     | Gasket     | 1     |
4N-0641     | Gasket     | 1     |
8C-5230     | O-Ring Seal     | 2     |
061-7540     | O-Ring Seal     | 2     |
109-0077     | O-Ring Seal     | 4     |
113-5304     | O-Ring Seal     | 2     |
Refer to Illustration 2.
Central and Lower (434-5056 Gasket Kit)
434-5056 Gasket Kit (Central and Lower Structure)     | ||
Part Number     | Part Name     | Qty     |
4N-0641     | Gasket     | 1     |
4N-0699     | Gasket     | 5     |
4N-1151     | Gasket     | 1     |
5P-5846     | O-Ring Seal     | 1     |
5P-8068     | O-Ring Seal     | 1     |
5P-8210     | O-Ring Seal     | 1     |
6V-3251     | O-Ring Seal     | 2     |
6V-9027     | O-Ring Seal     | 1     |
7C-0307     | Gasket     | 1     |
7W-6081     | Gasket     | 1     |
8C-3445     | Dust Cap     | 1     |
8C-5230     | O-Ring Seal     | 2     |
9X-7378     | O-Ring Seal     | 1     |
061-7540     | O-Ring Seal     | 2     |
114-4427     | O-Ring Seal     | 1     |
118-5068     | O-Ring Seal     | 1     |
119-5155     | O-Ring Seal     | 1     |
121-0145     | O-Ring Seal     | 1     |
165-6170     | Plug     | 3     |
214-7568     | O-Ring Seal     | 4     |
238-5084     | O-Ring Seal     | 2     |
250-0466     | O-Ring Seal     | 2     |
291-8145     | O-Ring Seal     | 1     |
Refer to Illustration 2.