Shutting down the right way
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Cooldown (longer for turbos), reading the gauges, logging hours, the vented loop, closing the seacock when you leave, and never switching batteries off with the engine running.
Sources (6)
- Normal shutdown: reduce to low idle, shift to neutral, run at low speed without load for about five minutes so the turbocharger and exhaust cool slightly; close the seacock after operation; do not turn the battery switch off immediately (Yanmar JH-CR operation manual) — yanmar.com
- Stop procedure: throttle to idle, neutral, idle a few moments to stabilize temperatures, key off; key left ON sounds the alarm and drains the battery; log engine hours from the hour meter; daily visual check for fuel, oil and water leaks; check anti-siphon valve operation (Westerbeke 55B/55C operators manual) — westerbeke.com
- Cool-down before shutdown keeps oil circulating and prevents heat-soak that can carbonize oil in turbo bearing passages — rpmdiesel.com
- An alternator field disconnect exists to protect the alternator diodes if the battery switch is turned to OFF while the engine is running — bluesea.com
- Engines at or below the waterline need a siphon break to prevent siphoning through the raw-water pump when stopped; close the through-hull while fixing a no-start and remember to open it after — themarinesurveyors.com
- Attach a tag as a reminder of a lay-up step that would affect the next start — boatus.com
General guidance for recreational boaters — your engine and equipment manuals and local regulations come first.