3504 Mercruiser CYLINDER BLOCK ASSEMBLY

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: 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     4W-3920     S/N:60M1-UP     SEBP3179     SENR7410    
4N-2247
179-0770
185-5890
7W-7584
179-0771
130-2549
124-3400
1W-0733
179-0769 Note: For ordering reference material contact your local Cat dealer.3412C 421-9722 Top End Overhaul Kit Consist
Table 2
421-9722 Top End Overhaul Kit Consist    
Gasket Kits    
Part Number     Part Name     Qty    
219-6544     After Cooler and Lines Gasket Kit     1    
419-8601     Single Cylinder Head Gasket Kit     2    
421-1305     Fuel System Gasket Kit     1    
421-8976     Oil Cooler and Lines Gasket Kit     1    
6V-0237     Expansion Tank 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    
2N-2766     Locknut     24    
3D-2824     O-Ring Seal     1    
4H-9541     Gasket     1    
4L-8337     O-Ring Seal     2    
5S-1188     O-Ring Seal     2    
6L-8562     Taperlock Stud     4    
8F-4994     O-Ring Seal     1    
8M-2296     Full Nut     4    
106-1792     Taperlock Stud     24    
245-8342     Gasket     1    
248-5513     Temperature Regulator     2    
305-6843     Guide Spring     24    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 g03389771
(1) Aftercooler and Lines ( 219-6544 Gasket Kit ) (2) Single Cylinder Head( 419-8601 Gasket Kit ) (3) Fuel System ( 421-1305 Gasket Kit ) (4) Expansion Tank ( 6V-0237 Gasket Kit ) (5) Oil Cooler and Lines ( 421-8976 Gasket Kit )Gasket Kit Consists
Aftercooler and Lines ( 219-6544 Gasket Kit )
Table 3
219-6544 Gasket Kit (Aftercooler and Lines)    
Part Number     Part Name     Qty    
3J-7354     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    
118-7214     O-Ring Seal