Engineering · Diesel — Overspeed Trip
An overspeed trip on a diesel engine acts independently of the governor to:
- AIncrease fuel at high load
- BOpen the cooling water bypass
- CShut off fuel (or air) if engine speed exceeds a preset danger limit✓ Correct
- DEngage the turning gear
Explanation
Should the governor fail and the engine run away (e.g., on lube-oil mist or a stuck rack), the overspeed trip independently cuts fuel — and on some designs shuts the air supply — to prevent catastrophic mechanical failure.
Authority: SOLAS Chapter II-1; Modern Marine Engineer's Manual
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