Series 50 – Section 26.11 Defective Pickup Screen Tube and Screen Assembly

Section 26.11
Defective Pickup Screen Tube and Screen Assembly

To determine if a defective pickup screen tube or screen assembly is causing low oil pressure, perform the following:‪

1. Remove pickup screen tube and screen assembly; refer to "3.2.1 Repair or Replacement of Oil Pump" .
2. Visually inspect pickup screen tube and screen assembly; refer to "3.2.3.1 Inspection of Oil Pump" .
   1. If no stress cracks, twisted screen tube, or cracked flange gaskets are found, check crankshaft main bearings; refer to "26.12 Defective Crankshaft Main Bearing Shells" .
   2. If stress cracks, twisted screen tube, or cracked flange gaskets are found; refer to "26.11.1 Pickup Screen Tube and Screen Assembly Repair" .

Section 26.11.1
Pickup Screen Tube and Screen Assembly Repair

Perform the following steps to repair the pickup screen tube and screen assembly:‪

1. Replace all damaged components identified during inspection.
2. Verify repairs to pickup screen tube and screen assembly; refer to "26.11.1.1 Test Engine with Repaired Pickup Screen Tube and Screen Assembly" .

Section 26.11.1.1
Test Engine with Repaired Pickup Screen Tube and Screen Assembly

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

1. Install the Diagnostic Data Reader to the vehicles Display Data Line Adaptor, see Figure "Typical Display Data Line Adaptor" ; refer to OEM guidelines.
2. Start and run engine speed at 1800 r/min.
3. Visually examine the DDR for oil pressure reading.
   1. 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.
   2. 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 crankshaft main bearings; refer to "26.12 Defective Crankshaft Main Bearing Shells" .