2004/01/26 Caterpillar

A New Spring for the Oil Filter Bypass Valve and for the Oil Cooler Bypass Valve is Now in Production {1306, 1314, 1318, 1378}

Usage:

TK711 101

Machine Engines:
3114
3116
3126
3126B
C-9

Description of Change: 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.

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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·m (32.23 lb ft)	4.7454 N·m (3.5 lb ft)
Direction of coils	Left hand	Right hand
Number of coils	17 total coils 15 active coils	21 total coils 19 active coils

Adaptable To: The former 9L-9188 Spring has been replaced with the new 242-3864 Spring. The new spring can be used as a direct replacement for all earlier 3114, 3116, 3126, 3126B, and C-9 engines. Refer to Table 2 for the serial number breaks.

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Table 2
Engine Model	Engine Serial Number
3114	S/N:2FG07987
3116	S/N:2MR03588
3116	S/N:7TM04072
3116	S/N:3AF00152
3126B	S/N:5GG04332
3126B	S/N:BMA09198
3126B	S/N:CSW00485
3126	S/N:55K12065
3126	S/N:6JK11925
C-9	S/N:4ZF10043
C-9	S/N:SAN00243

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.

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.

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