Series 50 – Section 26.5 Oil Pressure Gage Line Obstructed

Section 26.5
Oil Pressure Gage Line Obstructed

To determine if an oil pressure gage line obstruction is causing low oil pressure, perform the following: ‪

1. Disconnect oil gage line from oil pressure gage; refer to OEM guidelines.
2. Visually inspect oil gage line for obstructions.
   1. If no obstructions are found; check to determine if rocker arm shaft plugs are missing; refer to "26.6 Rocker Arm Shaft Plugs Missing (New or Rebuilt Engines Only)" .
   2. If obstructions are found; refer to "26.5.1 Obstructed Oil Pressure Gage Line Repair" .

Section 26.5.1
Obstructed Oil Pressure Gage Line Repair

Perform the following steps to resolve oil pressure gage line obstructions:‪

1. Remove oil pressure gage line; refer to OEM guidelines.
2. Clean oil gage line by soaking in cleaning solution for 5 minutes.
3. Blow out oil gage line of residue contamination with compressed air.
4. Install cleaned oil gage line; refer to OEM guidelines.
5. Verify oil gage line repair; refer to "26.5.1.1 Test the Engine with Repaired Oil Gage Line" .

Section 26.5.1.1
Test the Engine with Repaired Oil Gage Line

Perform the following to determine if replaced oil pressure gage 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 for missing or damaged rocker arm shaft plugs; refer to "26.6 Rocker Arm Shaft Plugs Missing (New or Rebuilt Engines Only)" .