-DQG-c1Ek.png)
Technical Article
Exhaust Valve Overhaul: Inspection, Leakage and Common Failures
Exhaust valve overhaul checks the spindle, seat, guide, cage, actuator, sealing surfaces, and air spring arrangement. Leakage, burning, deposits, sticking, and poor timing can raise exhaust temperature and reduce cylinder performance.
What causes exhaust valve leakage?
Leakage is commonly associated with worn or burned seating surfaces, deposits, poor cooling, incorrect closing, sticking movement, or foreign particles trapped at the seat.
Symptom, possible cause and inspection
| Symptom | Possible cause | Inspection |
|---|---|---|
| High exhaust temperature | Leaking exhaust valve, poor combustion, or late timing | Check valve condition and cylinder data |
| Slow valve closing | Air spring issue, sticking spindle, or actuator fault | Inspect air supply and movement |
| Burned seat/spindle | Leakage, poor cooling, or deposits | Inspect seating surfaces and cooling 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.
