Section 2.11
Defective Crankshaft Main Bearing Shells

To determine if defective crankshaft main bearing shells are causing low oil pressure, perform the following steps:‪

1. Check main bearing to crankshaft journal clearances; refer to appropriate service manual, engine chapter.
   1. If main bearing shell-to-journal clearance is within 0.040 - 0.151 mm (0.0016 -0.006 in.), check oil pump assembly; refer to "2.12 Defective Oil Pump Assembly" .
   2. If main bearing shell-to-journal clearance is not within 0.040 - 0.151 mm (0.0016 -0.006 in.), remove and replace defective crankshaft main bearing shells; refer to appropriate service manual, engine chapter.
2. Verify crankshaft main bearing shells repair: refer to "2.11.1 Test Engine with New Crankshaft Main Bearing Shells" .

Section 2.11.1
Test Engine with New Crankshaft Main Bearing Shells

Perform the following steps to determine if repaired relief valve resolved low oil pressure:‪

1. Connect to DDDL 7.0.
2. Start and run engine between 1800 rpm.
3. Visually examine DDDL 7.0 for oil pressure reading.
   1. If DDDL 7.0 indicates 241 kPa (35 psi), at 1800 rpm, shut down the engine and disconnect DDDL 7.0. No further troubleshooting is required.
   2. If DDDL 7.0 indicates less than 241 kPa (35 psi) at 1800 rpm, shut down the engine and disconnect DDDL 7.0. Check the oil pump assembly; refer to "2.12 Defective Oil Pump Assembly" .