Section 5.1 Obstruction or Damage to Breather System

Section 5.1
Obstruction or Damage to Breather System

Check as follows:‪

PERSONAL INJURY ‪
To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

1. Start and run the engine.
2. Perform a crankcase pressure test using J-48540–1 from the J-48540 kit. Refer to "5.1.1 Crankcase Pressure Test" .
3. Check the engine crankcase pressure.
   1. If the engine crankcase pressure is less than 2.5 in. H₂ O, no further troubleshooting is required. Shut down the engine.
   2. If the engine crankcase pressure is greater than 2.5 in. H₂ O, check the air compressor; refer to "5.2 Defective Air Compressor" .

Section 5.1.1
Crankcase Pressure Test

Check the engine crankcase pressure as follows:‪

To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.‪

ENGINE EXHAUST ‪
To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪

1. Start the engine.
2. Run the engine and bring the engine coolant temperature to normal operating range, 88-96°C(190-205°F).
3. Install J-48540–1 from the J-48540 kit on to the oil fill opening. Attach the gauge from kit J-48540, calibrated to read pressure in inches of H₂ O, on to the adaptor.
4. Run the vehicle to full load and rated speed. Use either chassis dynamometer or a trailer have the truck at full load.
5. Measure and record crankcase pressure.
6. Shut down the engine.
7. Remove the adaptor from the port.