Why Does a Diesel Engine Shake at Idle?
1 Answers
Here are the reasons why a diesel engine shakes at idle: 1. Stuck fuel injector: A stuck or poorly atomizing injector in one cylinder causes that cylinder to not work or work poorly (blue-white smoke may be emitted from the exhaust). This can be checked using the cylinder cut-off method. 2. Uneven fuel supply from the injection pump: Uneven idle fuel supply from the injection pump leads to inconsistent cylinder operation at idle. 3. Low RPM: Improper idle adjustment (too low RPM) can be resolved by adjusting the idle fuel supply screw. 4. Improper valve clearance: Incorrect valve clearance (due to loose adjustment screws, abnormal wear, or abnormal wear of the valve pushrod) causes the cylinder to not work or work poorly. This can be fixed by adjusting the valve clearance. 5. Poor valve sealing, leading to suboptimal operation. 6. Engine overheating or insufficient oil (causing poor lubrication), making it difficult for engine components to operate smoothly.