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

Bed Plate, A Frame, Tie Rods, Chocks
> Forces Acting On Tie rods

Piston and piston rings
> 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
> Cylinder Liner Checks During Scavenge Inspection

Exhaust valve & Stuffing Box
> 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
Properties of main engine crankcase and cylinder Lube Oil 
> Why Lube Oil TBN of Main Engine is less than Auxiliary Engine? 

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

Fuel Oil System

Scavenging

Turbocharging 

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

Crankcase
> 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 
Procedure for taking bottom end bearing clearance 

Starting & Reversing 
> Starting interlocks on Main Engine.
Starting Air Valve Diagram, Function and working

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

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

Miscellaneous
> Why do we Blow through Engines? Procedure
> What is after burning and what are its symptoms?

Troubleshoot
> 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

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