- Engine:
- 3412C (S/N: 9BR1-UP; 4121-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 | g03323398 |
Reference Material
Engine Model     | Engine Arrangement     | Engine Serial Number Range     | Parts Book Media     | Disassembly and Assembly Media     |
3412C     | 179-3232     | S/N:9BR1-UP     | SEBP2524     | SENR1133     |
179-0775 | ||||
179-0773 | ||||
179-0778 | ||||
183-5416 | ||||
238-5363 | S/N:4121-UP     | SEBP3959     | SENR1133     | |
238-5357 | ||||
238-5355 | ||||
238-5359 |
Note: For ordering reference material contact your local Cat dealer.
3412C 436-1678 Major Overhaul Kit Consist
436-1678 Major Overhaul Kit Consist     | ||
Gasket Kits     | ||
Part Number     | Part Name     | Qty     |
219-6544     | After Cooler and Lines Gasket Kit     | 1     |
234-1630     | Rear Structure Gasket Kit     | 1     |
419-8215     | Central and Lower Structure Gasket Kit     | 1     |
419-8222     | Front Structure Gasket Kit     | 1     |
419-8601     | Single Cylinder Head Gasket Kit     | 2     |
419-9849     | Fuel System Gasket Kit     | 1     |
420-8545     | Oil Cooler and Lines Gasket Kit     | 1     |
Additional Parts Included in This Kit     | ||
Part Number     | Part Name     | Qty     |
1R-0749     | Fuel Filter     | 2     |
1R-1808     | Engine Oil Filter     | 2     |
2B-2695     | Bolt     | 4     |
2K-4973     | Locknut     | 1     |
2N-2766     | Locknut     | 24     |
2N-8109     | Clamp     | 1     |
2S-2760     | Spring     | 1     |
3B-1915     | Bolt     | 2     |
3D-2824     | O-Ring Seal     | 1     |
3G-2292     | Locking Bolt     | 5     |
4H-9541     | Gasket     | 1     |
4L-8337     | O-Ring Seal     | 2     |
4M-1336     | Ferrule     | 1     |
4N-0342     | Plate     | 1     |
4N-0685     | Bushing     | 5     |
4N-2199     | Gasket     | 1     |
4N-6658     | Bushing     | 2     |
4N-8150     | Spring     | 2     |
5F-0304     | Plug     | 2     |
5H-8985     | Spring Pin     | 1     |
5M-2894     | Hard Washer     | 3     |
5S-1188     | O-Ring Seal     | 2     |
6N-0977     | Bushing     | 1     |
6N-1027     | Thrust Plate     | 1     |
7N-2443     | Thrust Washer     | 1     |
7W-6492     | Pipe Plug     | 2     |
7W-6534     | Pipe Plug     | 4     |
8F-4994     | O-Ring Seal     | 1     |
8M-2296     | Full Nut     | 4     |
8T-6757     | Pipe Plug     | 6     |
8T-6763     | Pipe Plug     | 4     |
8T-6767     | Pipe Plug     | 2     |
9S-4190     | O-Ring Plug     | 7     |
9S-8752     | Full Nut     | 19     |
9Y-2988     | Breather As     | 1     |
106-1792     | Taperlock Stud     | 24     |
111-2721     | Felt Plug     | 1     |
112-9217     | Thrust Plate     | 1     |
245-8342     | Gasket     | 1     |
248-5513     | Temperature Regulator     | 2     |
272-2583     | O-Ring Seal     | 1     |
305-6843     | Guide Spring     | 24     |
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.
3412C Engine Gasket Kit Locations
Illustration 2 | g03382484 |
(1) Aftercooler and Lines ( 219-6544 Gasket Kit ) (2) Rear structure ( 234-1630 Gasket Kit ) (3) Single Cylinder Head ( 419-8601 Gasket Kit ) (4) Central and Lower ( 419-8215 Gasket Kit ) (5) Fuel System ( 419-9849 Gasket Kit ) (6) Front Structure ( 419-8222 Gasket Kit ) (7) Oil Cooler and Lines ( 420-8545 Gasket Kit ) |
Gasket Kit Consists
Aftercooler and Lines (219-6544 Gasket Kit)
219-6544 Gasket Kit (Aftercooler and Lines)     | ||
Part Number     | Part Name     | Qty     |
3J-7354     | O-Ring Seal     | 1     |
4J-0522     | O-Ring Seal     | 1     |
4N-2564     | Gasket     | 1     |
4N-4307     | Gasket     | 1     |
4N-8628     | Gasket     | 1     |
7C-0307     | Gasket     | 1     |
109-0076     | O-Ring Seal     | 6     |
112-3258     | O-Ring Seal     | 3     |
112-3259     | O-Ring Seal     | 2     |
112-8186     | O-Ring Seal     | 2     |
245-8342     | Gasket     | 2     |
Refer to Illustration 2.
Rear Structure (234-1630 Gasket Kit)
234-1630 Gasket Kit (Rear Structure)     | ||
Part Number     | Part name     | Qty     |
1S-4810     | Oil Drain Gasket     | 2     |
1S-6595     | Oil Supply Gasket     | 2     |
2A-1162     | Gasket     | 4     |
2M-5446     | Gasket     | 1     |
4H-7869     | Gasket     | 1     |
4H-9541     | Gasket     | 1     |
4N-0933     | Gasket     | 2     |
4W-6382     | Gasket     | 1     |
5F-3144     | O-Ring Seal     | 2     |
6V-5101     | O-Ring Seal     | 1     |
7N-7559     | Gasket     | 1     |
7W-5648     | Gasket     | 2     |
8N-3887     | Gasket     | 1     |
9L-6924     | Gasket     | 1     |
9Y-6089     | Gasket     | 2     |
112-3540     | O-Ring Seal     | 2     |
114-2687     | O-Ring Seal     | 3     |
114-4427     | O-Ring Seal     | 1     |
142-5868     | Crankshaft Seal     | 1     |
161-7293     | Cylinder Gasket     | 1     |
226-4753     | Gasket     | 1     |
Refer to Illustration 2.
Central and Lower (419-8215 Gasket Kit)
419-8215 Gasket Kit (Central and Lower Structure)     | ||
Part Number     | Part Name     | Qty     |
3P-0650     | O-Ring Seal     | 3     |
5P-8068     | O-Ring Seal     | 1     |
6V-5048     | O-Ring Seal     | 2     |
8J-4351     | O-Ring Seal     | 1     |
109-0078     | O-Ring Seal     | 1     |
118-5068     | O-Ring Seal     | 1     |
165-6170     | Plug     | 3     |
214-7568     | O-Ring Seal     | 1     |
234-8937     | Integral Seal     | 1     |
239-5571     | Integral Seal     | 1     |
239-5572     | Integral Seal     | 3     |
343-8888     | Gasket     | 1     |
353-1648     | Oil Pan Gasket     | 1     |
Refer to Illustration 2.
Front Structure (419-8222 Gasket Kit)
419-8222 Gasket Kit (Front Structure)     | ||
Part Number     | Part Name     | Qty     |
2S-6151     | Gasket     | 1     |
3J-1907     | O-Ring Seal     | 2     |
4N-0933     | Gasket     | 1     |
4N-1946     | Gasket     | 1     |
5F-3144     | O-Ring Seal     | 1     |
5M-9735     | Lip Type Seal     | 1     |
5S-2106     | Lip Type Seal     | 1     |
6N-2508     | Gasket     | 1     |
6V-4314     | O-Ring Seal     | 1     |
6V-5048     | O-Ring Seal     | 2     |
7C-0307     | Gasket     | 4     |
8T-9527     | O-Ring Seal     | 1     |
9F-4446     | O-Ring Seal     | 1     |
9X-7371     | O-Ring Seal     | 1     |
109-0072     | O-Ring Seal     | 3     |
109-0073     | O-Ring Seal     | 1     |
109-0076     | O-Ring Seal     | 1     |
112-1579     | O-Ring Seal     | 1     |
112-1580     | O-Ring Seal     | 1     |
142-5867     | Crankshaft Seal     | 1     |
166-9145     | Cylinder Block Gasket     | 1     |
193-9155     | Gasket     | 1     |
214-7568     | O-Ring Seal     | 1     |
234-8937     | Integral Seal     | 1     |
239-5571     | Integral Seal     | 1     |
Refer to Illustration 2.
Single Cylinder Head (419-8601 Gasket Kit)
419-8601 Gasket Kit (Single Cylinder Head)     | ||
Part Number     | Part Name     | Qty     |
1J-9671     | O-Ring Seal     | 1     |
3E-6772     | Seal     | 24     |
3K-0360     | O-Ring Seal     | 1     |
3S-9643     | Lip Type Seal     | 2     |
4N-1156     | Regulator Cover Gasket     | 1     |
4N-1918     | Wound Gasket     | 2     |
4N-4307     | Gasket     | 1     |
4N-6295     | Return Sleeve     | 1     |
4N-7253     | Chamber Gasket     | 6     |
5P-5678     | Seal     | 7M     |
5P-8119     | O-Ring Seal     | 6     |
5P-8356     | O-Ring Seal     | 2     |
6V-3831     | O-Ring Seal     | 1     |
7C-0307     | Gasket     | 8     |
7L-4774     | O-Ring Seal     | 6     |
7M-7273     | Gasket     | 1     |
8H-9204     | Felt Washer     | 6     |
8L-2779     | O-Ring Seal     | 6     |
9F-7450     | Gasket     | 1     |
9L-6924     | Gasket     | 2     |
109-0072     | O-Ring Seal     | 5     |
109-0076     | O-Ring Seal     | 4     |
112-3258     | O-Ring Seal     | 2     |
112-3540     | O-Ring Seal     | 1     |
114-4427     | O-Ring Seal     | 1     |
126-2702     | Integral Seal     | 1     |
129-9452     | Exhaust Manifold Gasket     | 6     |
198-6068     | Integral Seal     | 1     |
214-7568     | O-Ring Seal     | 1     |
225-3099     | Cylinder Head Gasket     | 1     |
225-3101     | Plate Gasket     | 1     |
272-2583     | O-Ring Seal     | 3     |
Refer to Illustration 2.
Fuel System (419-9849 Gasket Kit)
419-9849 Gasket Kit (Fuel System)     | ||
Part Number     | Part Name     | Qty     |
1J-9671     | O-Ring Seal     | 1     |
1P-0436     | Gasket     | 1     |
1S-0004     | O-Ring Seal     | 2     |
2M-2489     | Lip Type Seal     | 2     |
3D-2824     | O-Ring Seal     | 4     |
3J-1907     | O-Ring Seal     | 2     |
3J-7354     | O-Ring Seal     | 1     |
3K-0360     | O-Ring Seal     | 1     |
4M-8303     | O-Ring Seal     | 1     |
4N-1104     | Gasket     | 1     |
4N-1105     | Gasket     | 1     |
4N-1636     | Gasket     | 1     |
4N-1868     | Gasket     | 1     |
4N-7465     | Gasket     | 1     |
5P-8119     | O-Ring Seal     | 12     |
6J-2419     | O-Ring Seal     | 1     |
6L-3528     | Gasket     | 1     |
6N-2508     | Gasket     | 1     |
6N-2645     | Gasket     | 1     |
6V-4314     | O-Ring Seal     | 1     |
6V-8977     | Lip Type Seal     | 1     |
7J-0204     | O-Ring Seal     | 1     |
7W-4482     | Washer     | 1     |
8H-9204     | Felt Washer     | 12     |
8L-2779     | O-Ring Seal     | 8     |
8L-2786     | O-Ring Seal     | 4     |
8L-3873     | Gasket     | 1     |
8S-5388     | Gasket     | 1     |
9L-9098     | Carbon Stop Seal     | 1     |
9X-7378     | O-Ring Seal     | 1     |
114-3362     | O-Ring Seal     | 1     |
114-8718     | O-Ring Seal     | 12     |
214-7568     | O-Ring Seal     | 11     |
271-2489     | Washer Seal     | 1     |
Refer to Illustration 2.
Oil Cooler and Lines (420-8545 Gasket Kit)
420-8545 Gasket Kit (Oil Cooler and Lines)     | ||
Part Name     | Part Number     | Qty     |
3P-0650     | O-Ring Seal     | 3     |
4N-0865     | Gasket     | 1     |
4N-1156     | Regulator Cover Gasket     | 4     |
4N-1946     | Gasket     | 1     |
4N-2199     | Gasket     | 1     |
4P-8881     | Gasket     | 1     |
5P-8068     | O-Ring Seal     | 1     |
6V-5048     | O-Ring Seal     | 1     |
7C-0307     | Gasket     | 2     |
8S-5543     | Gasket     | 1     |
109-0072     | O-Ring Seal     | 8     |
109-0074     | O-Ring Seal     | 1     |
109-0077     | O-Ring Seal     | 2     |
234-8937     | Integral Seal     | 1     |
343-8888     | Gasket     | 2     |
Refer to Illustration 2.