BOLT 1531185 - Caterpillar

Truck Engines:
3116 (S/N: 3RJ1-UP; 7HJ1-UP)
3126 (S/N: 6RW1-UP; 1BW1-UP)
3126B (S/N: 7JZ1-UP; BES1-UP; DCD1-UP; 6PZ1-UP)
3126E (S/N: HEP1-UP; LEF1-UP; 9SZ1-UP)
C7 (S/N: KAL1-UP; FML1-UP; FMM1-UP)
C9 (S/N: CKP1-UP; MTB1-UP)
Truck Engine News SEBD6764, January 2004, "A New Spring for the Oil Filter Bypass Valve and for the Oil Cooler Bypass Valve is Now in Production". Disregard this article. See the article that follows.A new stronger spring for the engine oil filter bypass valve and the engine oil cooler bypass valve has been released. The new spring has a higher spring rate and a higher preload when the spring is assembled. This combination of spring rate and preload improves cleanliness of the oil by allowing less oil to bypass the oil filter during cold starting conditions. Specifications for the spring have also changed. Refer to Table 1.
Table 1
Comparison of Springs    
Dimensions     New Spring     Old Spring    
Outside diameter    
11.0 mm (0.43 inch)    
11.2 mm (0.44 inch)    
Free length    
58.5 0.50 mm (2.30 0.020 inch)    
57.9 mm (2.28 inch)    
Assembled length    
43.18 mm (1.70 inch)    
43.18 mm (1.70 inch)    
Load at assembled length    
43.7 N (9.8 lb)    
15.6 N (3.5 lb)    
Direction of coils     Left hand     Right hand    
Number of coils     17 total coils
15 active coils     21 total coils
19 active coils    The former 9L-9188 Spring has been replaced with the new 242-3864 Spring. Refer to Table 2 for the serial number breaks.
Table 2
Engine Model     Engine Serial Number    
3116     S/N:3RJ04051
   
3116     S/N:7HJ09867
   
3126     S/N:6RW00889
   
3126     S/N:1BW01754
   
3126B     S/N:7JZ06379
   
3126B     S/N:BES00871
   
3126B     S/N:DCD00012
   
3126B     S/N:6PZ03004
   
3126E     S/N:HEP45410
   
3126E     S/N:LEF00096
   
3126E     S/N:9SZ17049
   
C7     S/N:KAL16913
   
C7     S/N:FML00011
   
C7     S/N:FMM00017
   
C9     S/N:CKP00054
   
C9     S/N:MTB00172
   The engine has two of the 242-3864 Springs. One spring is used for the oil filter bypass valve and the other spring is used for the oil cooler bypass valve.
Illustration 1 g01044967
(1) 242-3864 Springs Note: Engines that are equipped with a remote oil filter base require three 242-3864 Springs .The former 9L-9188 Spring has not been cancelled. The 9L-9188 Spring is still available for parts service in other applications of this spring.