To determine if a nonfunctional or sticking regulator valve is causing low oil pressure, perform the following steps:
1.2.Remove the oil pressure regulator; refer to appropriate service manual, lubrication system chapter.
Inspect the oil pressure regulator; refer to appropriate service manual, lubrication system chapter.
[a] If the regulator valve moves freely in the valve body; see Figure 2-1. reinstall the oil pressure regulator assembly; refer to appropriate service manual, lubrication system chapter. Check the bypass valve, refer to section 2.8.
[b] If the regulator valve will not move freely in the valve body, refer to section 2.7.1.
2.7.1
Oil Pressure Regulator Valve Repair
Perform the following steps to repair the oil pressure regulator valve:
1. Disassemble the pressure regulator valve and replace damaged components; refer to appropriate service manual, lubrication system chapter.
2. Assemble the pressure regulator valve; refer to appropriate service manual, lubrication system chapter.
3. Verify repair of the regulator valve; refer to section 2.7.1.1.
2.7.1.1
Test Engine with Repaired Oil Pressure Regulator Valve
Perform the following steps to determine if repaired oil pressure regulator valve resolved low oil pressure:
1. Connect to DDDL 7.0.
2. Start and run engine speed at 1800 rpm.
3. Visually examine DDDL 7.0 for oil pressure reading.
[a] If DDDL 7.0 indicates 241 kPa (35 psi) or more at 1800 rpm, shut down the engine and disconnect DDDL 7.0. No further troubleshooting is required.
[b] If DDDL 7.0 indicates less than 241 kPa (35 psi) at 1800 rpm, shut down the engine and disconnect DDDL 7.0; check bypass valve; refer to section 2.8.
