KIT-SEAL 2000920 - Caterpillar

Engine:
C-10 (S/N: 2PN1-UP; 3CS1-11999 and 12000-UP; 8YS1-UP)
C-12 (S/N: 1YN1-UP; 2KS1-39999 and 40000-UP; 9NS1-UP)
Illustration 1 g00979673
Three different gears are available for the C-10 and C-12 engines. The following information is to help during the rebuild of an engine. If the part number is not legible you can identify the crankshaft gear with dimensions. The dimensions are provided below and Illustration 1 will help with determining your gear.Dimensions of crankshaft gears116-1050 Crankshaft Gear Dimension (A) ... 47.3 0.5 mm (1.86 0.02 inch) Dimension (B) ... 38.5 0.5 mm (1.52 0.02 inch)155-6642 Crankshaft Gear Dimension (C) ... 48.5 0.5 mm (1.91 0.02 inch)160-8143 Crankshaft Gear Dimension (D) ... 38.5 0.5 mm (1.52 0.02 inch)It is important to have the correct crankshaft gear. The following tables provide information on selecting the correct crankshaft gear. Table 1 indicates the gear that is used on your engine.
Table 1
Crankshaft Gear     C-10     C-12    
116-1050     S/N:3CS1-11999
    S/N:2KS1-39999
   
155-6642     S/N:2PN1-UP
S/N:8YS1-UP
S/N:3CS12000-UP
    S/N:1YN1-UP
S/N:9NS1-UP
S/N:2KS40000-UP
   
160-8143     S/N:2PN1-UP
S/N:8YS1-UP
    S/N:1YN1-UP
S/N:9NS1-UP
   Crankshafts and short blocks are available for engine rebuilds. Table 2 provides information on the gears that are used for the crankshafts. Table 3 provides information on the gears that are used for the short blocks.
Table 2
Crankshafts    
Crankshaft Part Number     Gear Part Number     C-10     C-12    
0R-8196     160-8143
155-6642     S/N:2PN1-UP
S/N:8YS1-UP
S/N:3CS12000-UP
       
0R-9395     116-1050 (1)     S/N:3CS1-11999
       
0R-8195     155-6642     S/N:2PN1-UP
S/N:8YS1-UP
S/N:3CS12000-UP
       
0R-8214     160-8143
155-6642         S/N:1YN1-UP
S/N:9NS1-UP
S/N:2KS40000-UP
   
0R-9396     116-1050 (1)         S/N:2KS1-39999
   
0R-9907     155-6642         S/N:1YN1-UP
S/N:9NS1-UP
S/N:2KS40000-UP
   
( 1 ) Crankshaft with plate assembly
Table 3
Short Blocks    
   C-10    C-12    
Short Block Part Number     Gear Part Number     Gear Part Number    
0R-9661     160-8143
155-6642        
0R-9680         160-8143
155-6642    Using the correct crankshaft gear is essential for proper gear tooth alignment. Using the incorrect gear will cause your front gear group to experience premature failure. Use the two tables above to properly identify the gear for your crankshaft.