Connect the pressure signal line (1) to the lubricating
pump fitting (2) and the rifle pressure supply line (3) to the
oil rifle fitting (4).
Install the oil transfer tube. Refer to Procedure 2-11.
Operate the engine until the water temperature reaches
82°C [180°F], and check for leaks.
The viscosity sensor controls the oil pressure signal to the lubricating pump pressure regulator. It allows high oil
rifle pressure with cold, thick oil, but normal oil rifle pressure with warm oil. The high oil pressure with cold viscous
oil, highly improves oil fill of the STC injector tappets. This provides maximum engine timing advancement and
white smoke control. The sensor allows normal oil pressure when the oil is warm.
Table 1: Effect of Viscosity Sensor on Main Oil Rifle Pressure.
Oil Temperature
°C [°F]
Low Idle Oil Pressure
kPa [PSI]
High Idle Oil Pressure
kPa [PSI]
0 [32] 450 to 690 [65 to 100] 490 to 770 [70 to 110]
21 [70] 350 to 590 [50 to 85] 380 to 660 [55 to 95]
93 [200] 100 [15] 240 to 310 [35 to 45]
Section 2 - Lubricating System Viscosity Sensor - STC Engines (2-18)
N14 Page 2-47
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