60668 Mercruiser PLUG, OIL PASSAGE-REAR (3/4"CUP)

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    
3406C     177-8877     S/N:1SS1-UP     SEBP2520     SENR1143    
177-8874
177-8878
177-8879
177-8880
177-8876
177-8873
238-5347 S/N:4061-UP     SEBP3957     SENR6526    
238-5343
238-5345
238-5349
238-5342
4P-1987 S/N:2WB1-UP     SEBP2753     SENR3920    Note: For ordering reference material contact your local Cat dealer.3406C 434-4988 Major Overhaul Kit Consist
Table 2
434-4988 Major Overhaul Kit Consist    
Gasket Kits    
Part Number     Part Name     Qty    
232-3679     Rear Structure Gasket Kit     1    
433-7712     Fuel System Gasket Kit     1    
433-7869     Expansion Tank Gasket Kit     1    
434-0877     After Cooler and Lines Gasket Kit     1    
434-1858     Single Cylinder Head Gasket Kit     1    
434-2402     Front Structure Gasket Kit     1    
434-4989     Oil Cooler and Lines Gasket Kit     1    
434-5056     Central and Lower Structure 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    
2H-1193     Ferrule     1    
2N-2766     Locknut     12    
3G-2292     Locking Bolt     5    
4N-0685     Bushing     6    
4N-6658     Bushing     1    
4N-8150     Spring     2    
4S-6137     Taperlock Stud     1    
5M-2894     Hard Washer     12    
9Y-2988     Breather As     1    
100-7399     Plug     2    
106-1792     Taperlock Stud     11    
126-1756     Locking Bolt     4    
131-7123     Bushing     1    
248-5513     Temperature Regulator     1    
305-6843     Guide Spring     12    
321-8649     Fluid Sampling Valve As     1    
392-9208     Valve Plunger     2    Note: For assistance or technical questions contact your local Cat dealer.Note: Refer to Illustration 2 for location of gasket kits.3406C Engine Gasket Kit Locations
Illustration 2 g03406156
(1) Rear Structure ( 232-3679 Gasket Kit ) (2) Single Cylinder Head ( 434-1858 Gasket Kit ) (3) After Cooler and Lines ( 434-0877 Gasket Kit ) (4) Fuel System ( 433-7712 Gasket Kit ) (5) Expansion Tank ( 433-7869 Gasket Ki