Section 26.12
Defective Crankshaft Main Bearing Shells
To determine if defective crankshaft main bearing shells are causing low oil pressure, perform the following:
- Check main bearing to crankshaft journal clearances; refer to "Additional Information"
.
- 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 "26.13 Defective Oil Pump Assembly" .
- If main bearing shell-to-journal clearance is not within 0.040-0.151 mm (0.0016-0.006 in.); refer to "26.12.1 Crankshaft Main Bearing Shell Repair" .
Section 26.12.1
Crankshaft Main Bearing Shell Repair
Perform the following steps to repair crankshaft main bearing shells:
- Remove and replace defective crankshaft main bearing shells; refer to "1.9.2 Removal of Main Bearing Shell" .
- Verify crankshaft main bearing shells repair: refer to "26.12.1.1 Test Engine with New Crankshaft Main Bearing Shells" .
Section 26.12.1.1
Test Engine with New Crankshaft Main Bearing Shells
Perform the following to determine if repaired relief valve resolved low oil pressure:
- Install the Diagnostic Data Reader to the vehicles Display Data Line Adaptor, see Figure "Typical Display Data Line Adaptor" ; refer to OEM guidelines.
- Start and run engine between 1800 r/min.
- Visually examine the DDR for oil pressure reading.
- If the DDR indicates 241 kPa (35 lb/in.2 ), at 1800 r/min, shut down the engine and disconnect the DDR. No further troubleshooting is required.
- If the DDR indicates less than 241 kPa (35 lb/in.2 ), at 1800 r/min, shut down the engine and disconnect the DDR. Check the oil pump assembly; refer to "26.13 Defective Oil Pump Assembly" .
Series 50 Service Manual - 6SE50 |
Generated on 10-13-2008 |