78498 Mercruiser SPRING, TORSION-MOUNTING TUBE

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 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: For more information, visit us at: electricpowersupport.cat.com.Note: For assistance with technical questions, contact your local Cat dealer.Reference Material
Table 1
Engine Model     Engine Arrangements     Engine Serial Number Prefix     Parts Book Media     Disassembly and Assembly Media    
3412     179-0769
179-0770
179-0771     S/N:60M     SEBP3179     SENR7410    Note: For ordering reference material, contact your local Cat dealer.3412 460-9351 Major Overhaul Kit Consist
Table 2
460-9351 Major Overhaul Kit Consist    
Gasket Kits    
Part Number     Part Name     Qty    
460-4768     Single Cylinder Head Gasket Kit     2    
421-8976     Oil Cooler and Lines Gasket Kit     1    
454-4763     Front Structure Gasket Kit     1    
460-5277     Central and Lower Structure Gasket Kit     1    
419-8267     Rear Structure Gasket Kit     1    
219-6544     After Cooler and Lines Gasket Kit     1    
Additional Parts Included in This Kit    
Part Number     Part Name     Qty    
1L-8212     Gasket     1    
1R-0749     Fuel Filter     2    
1R-1808     Engine Oil Filter     2    
1S-0004     O-Ring Seal     2    
2N-0931     Gasket     3    
2N-2766     Locknut     24    
2P-8643     Gasket     1    
3D-2824     O-Ring Seal     3    
3J-1907     O-Ring Seal     10    
3J-7354     O-Ring Seal     3    
4H-9541     Gasket     1    
4L-3862     Gasket     4    
4L-8337     O-Ring Seal     2    
4N-3858     Gasket     2    
4N-6658     Bushing     2    
5F-9144     O-Ring Seal     1    
5S-1188     O-Ring Seal     2    
6L-8562     Taperlock Stud     4    
6N-0977     Bushing     1    
7C-0307     Gasket     4    
7M-7273     Gasket     1    
9H-2282     Starting Motor Gasket     1    
9Y-2988     Breather As     2    
109-0075     O-Ring Seal     2    
109-0079     O-Ring Seal     2    
110-7752     O-Ring Seal     4    
110-7753     O-Ring Seal     2    
114-8718     O-Ring Seal     12    
131-7123     Bushing     1    
214-7568     O-Ring Seal     3    
248-5513     Temperature Regulator     2    
272-2583     O-Ring Seal     5    
305-6843     Guide Spring     24    3412 Engine Gasket Kit Locations
Illustration 1 g03708837
(1) Single Cylinder Head ( 460-4768 Gasket Kit ) (2) Front Structure ( 454-4763 Gasket Kit ) (3) Central and Lower Structure ( 460-5277 Gasket Kit ) (4) Oil Cooler and Lines ( 421-8976 Gasket Kit ) (5) Rear Structure ( 419-8267 Gasket Kit ) (6) Aftercooler and Line