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Technical Article
Marine Engine Abnormal Vibration: Common Causes and Inspection
Abnormal marine engine vibration can result from cylinder power imbalance, misfiring, fuel injection faults, bearing distress, alignment problems, loose foundation bolts, crankshaft issues, turbocharger problems, or damaged rotating components. Diagnosis should separate combustion vibration from mechanical vibration.
Symptom, possible cause and inspection
| Symptom | Possible cause | Inspection |
|---|---|---|
| Vibration linked to one cylinder | Misfire, injector fault, compression issue, or exhaust valve leakage | Compare cylinder readings and isolate affected unit |
| Vibration across speed range | Alignment, foundation, crankshaft, or rotating component issue | Inspect mounts, foundation, shafting, and bearings |
| Vibration with turbocharger noise | Turbocharger fouling, imbalance, or surge | Inspect turbocharger and air/exhaust path |
Measurements and acceptance limits
Condition assessment should be based on recorded measurements, visual findings, operating symptoms, and the applicable maker documentation. Acceptable limits should be confirmed against the applicable manufacturer's manual and engine-specific technical documentation.
Need technical assistance?
If inspection, overhaul, troubleshooting, workshop repair, or onboard attendance is required, Dieselmech Group can review the symptoms, engine details, operating history, and available measurements before recommending the next practical step. Contact us at +65 6334 1855, email sales@dieselmech.com.sg, or submit an enquiry through the Contact Us page.
Technical note
This article is for general technical information. Actual procedures, limits, clearances, pressures, temperatures, torque values, and renewal criteria depend on the engine model, configuration, maker revision, service bulletin, vessel procedures, and class requirements. Manufacturer manuals and vessel safety procedures take precedence. Safety-critical work should be carried out by appropriately qualified personnel.
Published by Dieselmech Group Technical Team. For advice on a specific engine or fault, contact our marine engineers.
