The owner said it was not a major issue and repairs had been completed after it ran into trouble on Tuesday.
Last week, the vessel was taken out of service due to a faulty ventilation fan.
A Calmac spokesman told the BBC the split pipe carried lubricants to the gearbox.
"It was not a major issue but clearly required attention. Repairs have now been completed and she is able to enter service when weather conditions allow," he added.
"As
