Example of a Comprehensive Crankshaft Repair Assignment, Started and Then Abandoned by a Competitor
During the last days of 2020, our in-situ repair specialists out of Gothenburg, Sweden, repaired a damaged crankpin on a Korean-made four-stroke engine. The engine has a 32 cm bore and a 40 cm stroke and is installed on a 5 year old, 9’200 TEU container vessel.
When contacted by the ship owner, we proposed to carry out an inspection on board. The shipowner agreed, whereafter our specialist from QuantiServ Panama carried out a thorough inspection in Panama. To our disappointment, the ship owner then awarded the repair work to another company. Their technicians machined the pin to – 0.80 mm undersize and then gave up and disembarked from the vessel.
Finding himself in a tight spot, the customer came back to us and asked us if we could continue the repair that was abandoned by the other company. We took the opportunity to demonstrate that we succeed where others fail. Two in-situ specialists from QuantiServ Sweden joined the vessel and successfully carried out the repair work while underway from Lima, Peru to Manzanillo, Mexico. They solved the problems as follows:
|Damaged surface and cracks||Machining||Crankpin under-sized to – 3.00 mm|
|Excessive hardness||Heat treatment (Annealing)||Hardness Reduced from 620 HB to 255 HB|
|Bent crankshaft||Peening||Run-out reduced from 0.27 mm to 0.03 mm|
The customer was very happy with the skills and performance of our specialists. He therefore kept them on board for subsequent reassembly and overhaul works and he also asked us to supervise an overhaul of a similar engine installed on a sister vessel.