What must be done to ensure proper operation of the engines during back flushing?

For proper operation of the engines during back flushing, it is essential that the engines are declutched. Declutching ensures that the engines can operate independently of the vessel’s gear system, preventing any potential load or stress on the engine components during the flushing process. This allows for a safe and effective back flushing procedure, where fluids can circulate and clean out any debris or contaminants without the added complication of the drive system being engaged.

Maintaining the engines declutched also prevents potential damage that could occur if the engines were engaged or in gear during this maintenance activity. Back flushing involves running the engines and circulating fluid through the system in a way that could introduce issues if the drive components were engaged. As a result, declutching is a critical step to ensuring the integrity of the vessel's propulsion while performing this necessary maintenance task.