Australian storage problems vary from tropical humidity and microbial fuel growth to frost exposure in colder regions. A boat left on a mooring also faces salt, galvanic activity, battery discharge and unattended leaks.
Before a long lay-up, follow the engine manual. Common tasks include changing contaminated oil, stabilising or managing fuel, servicing filters, protecting the raw-water circuit, verifying coolant freeze and corrosion protection, caring for batteries and sealing identified openings without blocking required ventilation.
Do not assume a full tank is always right. It reduces moist air volume but increases the amount of ageing fuel and the consequences of a leak. A nearly empty tank is easier to clean but can develop condensation and corrosion. Tank material, fuel quality, storage duration and climate determine the plan.
In warm northern waters, regular fuel sampling and clean dry tanks matter. During cyclone preparation, machinery readiness includes charged start batteries, clean fuel, cooling checks and secure access, but the engine must not be treated as a substitute for a safe cyclone plan.
On recommissioning, inspect nests, corrosion, closed valves, seized controls and degraded hoses. Turn or pre-lubricate the engine only as the manufacturer permits. Confirm raw-water flow immediately after start and inspect all systems under load before relying on the vessel offshore.