What Causes Diesel Engine Idle Vibration?
1 Answers
Common causes of diesel engine idle vibration are as follows: 1. A stuck or poorly atomizing injector nozzle in one cylinder, causing that cylinder to misfire or perform poorly (blue-white smoke may appear in the exhaust). This can be checked using the cylinder cut-off method. 2. Uneven idle fuel supply from the injection pump, resulting in uneven cylinder operation at idle. 3. Improper idle speed adjustment, which can be resolved by adjusting the idle fuel supply screw. 4. Incorrect valve clearance, causing a cylinder to misfire or perform poorly. This can be fixed by adjusting the valve clearance. 5. Poor valve sealing, leading to suboptimal performance. 6. Engine overheating or insufficient oil, causing mechanical components to operate with difficulty.