SPRING 6Y2571 - Caterpillar

Marine Engine: 3406E MARINE (S/N: 9WR1-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
Table 1
Engine Model     Engine Arrangement     Engine Serial Number Range     Parts Book Media     Disassembly and Assembly Media    
3406E     177-4177     S/N:9WR1-UP     SEBP2555     SENR1169    
131-8300
177-4180
177-4178
177-4179 Note: For ordering reference material contact your local Cat dealer.3406E 433-7635 Major Overhaul Kit Consist
Table 2
433-7635 Major Overhaul Kit Consist    
Gasket Kits    
Part Number     Part Name     Qty    
349-1530     Rear Structure Gasket Kit     1    
433-7623     After Cooler and Lines Gasket Kit     1    
433-7638     Oil Cooler and Lines Gasket Kit     1    
433-9243     Heat Exchanger Gasket Kit     1    
433-9843     Fuel System Gasket Kit     1    
434-0855     Central and Lower Structure Gasket Kit     1    
434-0857     Front Structure Gasket Kit     1    
438-8574     Single Cylinder Head 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    
2N-0931     Gasket     4    
2N-2766     Locknut     12    
2N-3350     O-Ring Seal     2    
3G-2292     Locking Bolt     5    
3S-9643     Lip Type Seal     2    
4N-0641     Gasket     1    
4N-0933     Gasket     2    
4N-1156     Regulator Cover Gasket     1    
4N-8150     Spring     2    
5P-5678     Seal     7M    
6V-6609     O-Ring Seal     3    
9X-7378     O-Ring Seal