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  • #15893
    esailor Team
    Keymaster

    GMA Candidate
    Paisley 27/08/18
    55 minutes
    Asked to see my passport and discharge book while asking what ships I sail on. Checked and saw that I was going for an unlimited ticket so said we’ll have to cover 2 strokes and boilers too etc.
    1. Full procedure for removal of a piston from a large 2 stroke, ( during my answer he asked various questions, see below.)
    2. How does the hydraulic jack actually work for removing the cylinder head nuts?
    3. What if one nut was to get stuck? This eventually escalated to having to go well above the bolt manufacturers specifications with the jack so would permanently deform the bolt.
    4. Can you draw the stress/ strain diagram and also indicate the yield point,elastic range etc.
    5. Checks on the piston once it is out the engine? Covered in depth.
    6. How to check butt clearance on a new ring is within specifications – put in liner and measure the butt clearance before putting into piston
    7. Checks on the liner- when I mentioned checking ovality he asked about the different lateral forces on a 2 stroke and 4 stroke liner.
    8. What is cloverleafing?
    9. Said a motor needs failed bearings replaced, so how would I start the job. I went through a full isolation procedure and he asked a few other questions about locking and tagging etc but was happy with what I’d said about removing the motor. He mentioned that it is good practice to mark up the supply cables to make it easier when putting the motor back,( I had said I’d take a picture.)
    10. This then lead onto- suppose you were the 2nd engineer and the other 2nd had to get off for an emergency- he has fitted the motor back to the pump and it’s all good to go other than it needs wired up with the supply. It’s a positive displacement pump so how will you know how to wire it up correctly? All he was simply looking for was to disconnect the shaft coupling between motor and pump then test the motor to ensure it is rotating the correct way.
    11. Asked me about how to maintain compliance of UMS and about planned maintenance on the actual UMS systems alarms etc.
    12. Asked if we carry dangerous goods onboard?
    13. What SOLAS chapter covers this?
    14. What marpol annex’ cover this?
    15. Wanted a refrigeration drawing with both a meat room and a veg room and then for me to talk him through it all.
    16. How does the expansion valve work?
    17. He asked what my compressor discharge and suction pressures were and then how come the suction pressure for the compressor can be the same for both the meat room and veg room (he explained that I had missed a valve after the veg room that maintains the pressure slightly above the suction of the compressor so that it doesn’t also cool the veg room to -18’C.

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