General Crankshaft Faults
General Crankshaft Faults
Very rarely there are issues found on a crankshaft, only in the case when the engine experiences any of the following extreme conditions. The component of engines are quite reliable and sturdy but some common fault mentioned below can cause failure:
1. Worn journals
Worn journals is caused due to insufficient oil pressure. The crankshaft journals comes in direct contact with the bearing surfaces which gradually increases the clearance and decreases the oil pressure. Worn journals can cause very serious problem to the engine if not taken care of. It can also lead to destroying the bearing and can cause huge damage to the engine.
2. Fatigue
Fatigue refers to as the constant forces on the crankshaft which lead to the fractures. This problem usually occurs on the fillets where the journals and the web are joined together. The cracks which develop can be inspected on crankshaft with the use of a magna fluxing. The majority of steel crankshaft failure occurs due to fatigue failure that can originate at the change of cross-section.
3. Failure due to Vibration
Whenever the engine is running with heavy vibration during torsional vibration, it can lead to a crack in the crankpin and journal.
4. In adequate amount of lubrication
In case the lubrication of bearing in the crankshaft is in adequate then it can lead to complete wiping out of the bearing and failure of the crankshaft.
5. Over Pressurized Cylinder
It is possible that there is a hydraulic lock inside the liner caused due to extreme pressure at the crankshaft or even bent.
Reasons for Crankshaft Misalignment
1. Damage or wipe-out of the main bearing
2. Loose engine foundation bolt leading to vibration
3. Deformation of ship’s hull
4. Crack in the bearing saddle
5. Loose main bearing bolt leading to damage of main bearing
6. The high bending moment is applied on the crankshaft due to the excessive force from the assembly of the piston.
7. Grounding of the ship
8. Crankcase explosion or fire
9. A defective or worn out stern tube or intermediate shaft bearings
10. Loose or broken chokes in the foundation
11. Bearing pockets cracked
12. Bedplate deformed — transverse girder damaged
13. Tie bolts slack or broken
14. Weakening of structure due to corrosion
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