BOLT 8T0643 - Caterpillar

Engine: 3412 (S/N: 3JK1-UP) 3412C (S/N: 3JK1-UP; RLR1-UP; RTY1-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 contains a set of 12 standard rod bearings.Note: This kit does not contain 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    
3412C     143-3523     S/N:3JK1-UP     SEBP2969     SENR5534    
143-3522
105-4832
105-4833
132-6105 S/N:RLR1-UP     SEBP3959     SENR1133    
132-6109 S/N:RTY1-UP     SEBP4214     RENR1389    Note: For ordering reference material contact your local Cat dealer.3412C 421-9719 Major Overhaul Kit Consist
Table 2
421-9719 Major Overhaul Kit Consist    
Gasket Kits    
Part Number     Part Name     Qty    
160-9874     Single Cylinder Liner Gasket Kit     12    
176-8167     After Cooler and Lines Gasket Kit     1    
420-4422     Rear Structure Gasket Kit     1    
281-0029     Single Fuel Injector Gasket Kit     12    
420-4888     Single Cylinder Head Gasket Kit     2    
420-0667     Central and Lower Structure Gasket Kit     1    
420-2031     Fuel System Gasket Kit     1    
420-0668     Front Structure Gasket Kit     1    
420-8545     Oil Cooler and Lines Gasket Kit     1    
420-4427     Heat Exchanger Gasket Kit     1    
Additional Parts Included in This Kit    
Part Number     Part Name     Qty    
0L-0765     Stud     2    
1R-0749     Fuel Filter     2    
1R-1808     Engine Oil Filter     2    
2B-2695     Bolt     4    
2K-4973     Locknut     3    
2N-2766     Locknut     24    
2N-8109     Clamp     1    
2P-3760     Gasket     2    
2P-7846     Hose