Marine 2 Stroke Engine | Main Propulsion Engine | Notes | Guide

        It is a complete guide for Marine Engine Two Stroke Engine. This is a good collection of notes prepared in the purview  of Marine exams in  a simple and easy understandable language with  bullet points.

As it is impossible to answer all questions at a time it is done on timely basis. please comment below or contact on admin@marinesite.info, once you find any important area, missed out.  Also contact us, if you wish to answer any of the questions listed.

Basics

> Concept of Compression Ignition  Engines

> Basics of Two-stroke cycle, How Marine Engine Works?

> Ideal Cycles for IC engines (Otto cycle, diesel cycle, Dual cycle)

> Stroke, Swept Volume, Compression Ratio, Clearance Volume 

> Significance of Clearance volume 

> Actual PV Diagram of Marine Diesel Engines 
> Valve Timing Diagrams Of Main Engines 

> Difference Between Two Stroke and Four Stroke Marine Engines
> Main Engine Component Materials 

Bed Plate, A Frame, Tie Rods, Chocks

> Bed Plate Construction, Types, Material, Diagram 

> A Frame In Marine Diesel Engine 

> What is Tie rods? diagram And Functions of tie rods? 

> Forces Acting On Tie rods

> Holding Down Bolts and Chocks. Why Resin chocks are used in main engine

> How to Use hydraulic jack in Tie Roads

Piston and piston rings

> Draw piston diagram 2-strock & 4-strock 

> Difference between Trunk piston and Crosshead piston

> Types of piston rings in marine engine Function & Material 

> Piston ring calibration. Axial clearance, butt clearance, radial clearance.

> What is Blow-past, causes, Remedies 

> Difference Between Oil Cooled and Water Cooled Piston.

> If a piston has suffered damage/crack, how is the main Engine Unit out off?

> Why does a Piston seize? What action will you take if Main Engine Piston is about to seize?

> How to remove piston?

Cylinder Head & Cylinder Liner

> Mountings in cylinder head 
> Why Liners are Generally Thinner at the Bottom than at the Top ?

> Cylinder Liner Checks During Scavenge Inspection

Exhaust valve & Stuffing Box

> Exhaust Valve in Marine Diesel Engine Diagram, Working, Material

> Stuffing box components

> What is the difference between stuffing box drain oil and scavenge space drain oil?

> Do two stroke engines need tappet clearance adjustment? Why?

LO System

> Explain Main Engine Lub Oil System?

> Function And Types of Lubrication In Marine Diesel Engine

> Properties of main engine crankcase and cylinder Lube Oil 

> Why Lube Oil TBN of Main Engine is less than Auxiliary Engine? 

> Lube Oil Sampling Procedure 

> Lube Oil Tests On Ships 

> Cylinder Lubrication is admitted on which Stroke ?

Telescopic Pipes

> What is Telescopic pipes
> Why telescopic pipes used for oil lubrication?

Fuel Oil System

> Explain Fuel Oil System With Diagram 

> Fuel Injector Leaking Causes, Indication, Action  

> Puncture Valve function, working 

> Fuel Pump Working, Types And Functions 

> Explain VIT & Super VIT 

> What Is Fuel Quality Setting (FQS) 

Scavenging

> What is Scavenging ? Types Of Scavenging in Marine Diesel Engines

> Which scavenging method is used for slow speed marine engines? 

> Causes, Symptoms, Action & Precaution of Scavenge Fire 

> Scavenge Space Inspection Procedure 

Turbocharging 

> What is Super Charging or Pressure Charging Methods

> What is Turbocharging? Types of Turbocharging 

> Types of Turbochargers In Marine Diesel Engines

> Turbocharger Construction, Working, Material  

> Turbocharger surging Causes, Prevention and Remedies 

> Turbocharger Water & Grit washing Procedure

> Causes, Effects and Prevention Of Turbocharger Over-run

Cooling System

> Draw and explain Main engine cooling system

> Why is an expansion tank provided in jacket cooling water system?

Crankcase

> What will you check in crane case inspection? Procedure 

> What is crankcase explosion? Causes, Prevention and action taken? 

> How to detect Hotspot? What will be your action After hotspot/Oilmist alarm? 

> How to Fight Crankcase fire? 

> Oil Mist Detector (OMD) Working, Construction, Diagram

> Crank case relief door with diagram 

> How will you test the opening pressure of a crank case relief door?

> Setting pressure of crankcase relief valve? Relationship between area of relief valve and volume of crankcase.

Crankshaft 

> Crank shaft deflection, Measurement, Procedure 

> Procedure for taking bottom end bearing clearance 

Starting & Reversing 

> Air starting diagram

> Starting interlocks on Main Engine.

> Safeties provided in starting air system 

> Automatic Master Start Air Valve Dagram,Function and working

> Starting Air Valve Diagram, Function and working

> Starting air valve leak testing  

 Maneuvering

> Manoeuvring diagram

> During Manoeuvring if automatic air starting valve gets seized, What action will you take

> What is Crash maneuvering? From where we do the crash maneuvering? 

Stern Tube

> Sketch stern tube lubricating oil system.

Thrust Block

> Trust block diagram?
> What is the role of the Thrust block?
> Where it is placed with reason?

> If thrust bearing lubricating oil temp. is getting higher, what action will be taken by you? 

Alarms And Safeties

> Main engine Safety Device And Safety Trips 

Miscellaneous

> Why do we Blow through Engines? Procedure

> What is after burning and what are its symptoms?

Troubleshoot

> Hydraulic Locking (Hydrolock) Of Main Engine      

 >Black smoke From engine. 

> How exhaust gas temperature increase after the exhaust manifold. why?

> How do you come to know an exhaust valve is leaking in any cylinder’?

> Exhaust temp of one unit is high; what could be the reason?

> If water is found in crank case LO, what could be the cause?

> Give reasons for main engine not starting on air.

> What will you check if piston cooling and jacket cooling temperatures start going high?

> What are the symptoms of piston crack and liner crack? 

> What action will you take? State the symptoms at of piston running hot.

> State the symptoms at of piston running hot. Piston cooling oil outlet temp high