- 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)
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.
| 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.
| 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.