DD15 Restrictive Air Filter Troubleshooting

Check as follows:‪

1. Check the restriction gauge.
   1. If the gauge show restriction, go to step 3 .
   2. If the reading is ok, go to the next step.
2. Install a dyno and check air line restriction with a manometer.
   1. If air line restriction is high, find the source of air inlet blockage.
   2. If air line restriction is fine, go to the next step.
3. Remove the air filter element; refer to OEM guidelines.
4. Attempt to start and run the engine.
   

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

   1. If the engine starts and runs, no further troubleshooting is required. Shut down the engine.
   2. If the engine fails to start and run, go to the next step.
5. Replace the air filter.
   1. Visually inspect the air filter for clogging and replace as necessary; refer to OEM guidelines.
   2. Visually inspect gaskets for deterioration and replace as necessary; refer to OEM guidelines.
   3. Visually inspect air inlets for restrictions and clean as necessary; refer to OEM guidelines.
6. To determine if the replaced air filter resolved starting difficulty.
   1. Attempt to start and run the engine. If the engine starts and runs, no further troubleshooting is required. Shut down the engine.
   2. If the engine fails to start and run, check compression; refer to “3.6 Low Compression” .