To determine if a defective bypass valve is causing low oil pressure, perform the following steps:
1.2.Remove the oil filter adaptor; refer to appropriate service manual, lubrication system chapter.
Inspect the oil filter adaptor; refer to appropriate service manual, lubrication system chapter.
[a] If no damage is found with the oil filter adaptor components, reinstall the oil filter
adaptor; refer to appropriate service manual, lubrication system chapter. Check
pressure relief valve, refer to section 2.9.
[b] If damage is found with the oil filter adaptor components; refer to section 2.8.1.
2.8.1
Oil Filter Adaptor Repair
Perform the following steps to repair the oil filter adaptor:
1. Disassemble the oil filter adaptor; refer to appropriate service manual, lubrication system chapter.
2. Assemble the oil filter adaptor; refer to appropriate service manual, lubrication system chapter.
NOTE:
Always replace the copper washer whenever the adaptor plug is removed.
3.4.Install repaired oil filter adaptor; refer to appropriate service manual, lubrication system
chapter.
Verify repairs made to the oil filter adaptor; refer to section 2.8.1.1.
2.8.1.1
Test Engine with Repaired Oil Filter Adaptor
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 vary the engine speed between 1800 -2100 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), shut down the engine and
disconnect DDDL 7.0, check pressure relief valve; refer to section 2.9.
