858891T 4 Mercury ECU, Engine Control Unit

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    
3412D     238-8191     S/N:REA1-UP     SEBP3998     UENR3262    
238-8190 Note: For ordering reference material contact your local Cat dealer.3412D 436-1748 Major Overhaul Kit Consist
Table 2
436-1748 Major Overhaul Kit Consist    
Gasket Kits    
Part Number     Part Name     Qty    
420-0923     After Cooler and Lines Gasket Kit     1    
420-4866     Rear Structure Gasket Kit     1    
420-4502     Single Cylinder Head Gasket Kit     2    
420-0925     Central and Lower Structure Gasket Kit     1    
421-1305     Fuel System Gasket Kit     1    
420-0926     Front Structure 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    
2B-2695     Bolt     4    
2K-4973     Locknut     1    
2N-2766     Locknut     24    
2N-8109     Clamp     1    
2P-8669     Gasket     1    
2S-2760     Spring     1    
3B-1915     Bolt     2    
3E-6773     O-Ring Seal     2    
3G-2292     Locking Bolt     5    
4M-1336     Ferrule     2    
4N-0342     Plate     1    
4N-0685     Bushing     5    
4N-6658     Bushing     2    
4N-8150     Spring     2    
5F-0304     Plug     5    
5H-8985     Spring Pin     1    
5M-2894     Hard Washer     3    
6K-0806     Cable Strap     6    
6N-0977     Bushing     1    
6N-1027     Thrust Plate     1    
6V-1520     Drain Valve     2    
6V-5063     O-Ring Seal     1    
7N-2443     Thrust Washer     1    
7W-6492     Pipe Plug     2    
7W-6534     Pipe Plug     6    
8M-2296     Full Nut     8    
8T-6757     Pipe Plug     6    
8T-6763     Pipe Plug     4    
9S-4190     O-Ring Plug     6    
9Y-2988     Breather As     1    
061-9456     O-Ring Seal     1    
106-1792