Marine Two-Stroke Main Engine

Marine Two-Stroke Main Engine is a picture-led study guide to a large slow-speed, crosshead, uniflow-scavenged two-stroke main engine, written for marine engineering students and officers preparing for UK MCA oral examinations: Engineer Officer of the Watch (EOOW), Second Engineer (Class 2) and Chief Engineer (Class 1).

Turn the engine in your hands. The interactive 3D model works completely offline. Drag to rotate, pinch to zoom, run the engine to see the crank, crossheads, pistons and valves move, cut the casing away to see inside, watch the scavenge air, the exhaust gas and the cylinder oil flow through the engine, pull the parts apart in an exploded view, and tap any part to see what it is and how it works.

WHAT IS INSIDE

3D Model: cutaway, running engine, air, gas and cylinder oil flow, exploded view, guided tour, tap any part for its card.

How it Works: the story of the engine in twelve steps, each with a picture and a button to see it in 3D, plus the key figures of a typical installation.

Parts: 34 picture cards. Each gives what it is, how it works, the material, checks and the examiner's questions, with a Show in 3D button.

Diagrams: nine system drawings, two labelled pictures and seven drawings of the cycle and timing, the lubricating oil, cooling water, fuel oil, starting air, scavenge and exhaust, and the crankcase explosion and scavenge fire arrangements. Tap a drawing to open it full screen and pinch to zoom.

Operation: before starting, starting, running checks, stopping, after stopping, emergency operation and safety points.

Oral Questions: choose EOOW, Class 2 or Class 1 and a topic, say your answer aloud, then reveal the model answer with key points and the source. Mark yourself Got it, Nearly or Missed; progress is kept on your device.

Picture Quiz: a picture of a part and four names. Multiple Choice Quiz: questions with the answers shuffled every time.

Glossary of two-stroke engine terms.

Maintenance and Faults and Remedies: intervals, procedures, symptoms, causes and actions, from daily checks to scavenge fires, crankcase oil mist, bearing trouble and emergency running.

SYLLABUS
Every oral question is mapped to the MCA engineer oral examination syllabus, MIN 654 (M) Amendment 1 (April 2026), and every relevant knowledge line of the EOOW and Chief/Second Engineer competency grids is covered by at least two questions. Browse the questions by grade or by MIN 654 competence.
Source of the syllabus: Maritime and Coastguard Agency, MIN 654 (M) Amendment 1, published on gov.uk: https://www.gov.uk/government/publications/min-654-m-engineering-and-electro-technical-officer-oral-exam-syllabus-amendment-1 . This app is an independent study aid and is not affiliated with or endorsed by the MCA or any government body.

FREE AND PRO
Free: the 3D model, How it Works, all part cards, Operation, the glossary, the system diagrams, the EOOW oral questions, 15 multiple choice questions and 10 picture quiz items.
Pro (one payment, no subscription): the Class 2 and Class 1 oral questions, Faults and Remedies, Maintenance, the full quizzes and Search.

PRIVATE AND OFFLINE
No adverts, no analytics, no account, no data collected. Purchases are handled by Google Play. Everything works offline.

ABOUT THE CONTENT
Content based on the operating manuals of a reference engine, the author's teaching and general marine engineering knowledge; not affiliated with any manufacturer. The explanations are the author's own, informed by the operating manuals of a typical slow-speed two-stroke main engine installation. Your own engine will differ.

Created by Anindya Banerjee
www.anindyabanerjee.co.uk

For educational use only. Always consult the engine maker's instruction manual, your company procedures and your ship's own documentation.