Main Engine

PROCEDURE FOR OVERHAULING AND ASSEMBLY OF PISTON OF MAIN ENGINE ON SHIP.

SAFETY PRECAUTIONS

-On FWE get immobilization permission and propeller clearance from bridge.
-under piston spaces and scavenge space ventilate by blower.
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PROCEDURE FOR OVERHAULING AND ASSEMBLY OF CYLINDER HEAD OF MAIN ENGINE ON SHIP.

SAFETY PRECAUTIONS

-On FWE get immobilization permission and propeller clearance from bridge.
-under piston spaces and scavenge space ventilate by blower.
-Stopped engine
-Shut off starting air supply At starting air receiver
-Block the main starting valve
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FUEL OIL LINE DIAGRAM AND EXPLANATION IN SHIP

Engineers must be well conversant with fuel oil and lube oil installation onboard and various associated functions such as bunkering ,transfer, purification ,combustion and disposal . Fuel oil are carried in tanks in the vicinity of the engine room
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CROSSHEAD BEARING CLEARANCE

The top clearance between the journal and a new bearing shell is the result of a summation of the production tolerances of the bearing assembly components.
The top clearance for a new bearing will normally be in the range stated in Data. Note that the figures are to be used for guidance only.
For the top clearance of a specific bearing, see the measurement in the Adjustment Sheet 
1. Open the crankcase door at the relevant
cylinder.

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CRANKPIN BEARING CHECKING and DISMANTLING

The bottom clearance between the journal and a new bearing shell is the result of a summation of the production tolerances of the bearing assembly components.
For the bottom clearance of a specific bearing
1. Open the crankcase door at the relevant
cylinder.
2. Turn the crank 
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OVERHAULING OF CONNECTING ROD FROM main engine on ship

This procedure applies to the overhauling of connecting rod following two dismantling situations:

• with piston mounted
• with piston removed

With piston mounted:
1. Turn the crankshaft down far enough to give access to the nuts and screws on the piston rod.

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Reasons for fuel oil purifier overflow on ship

Overflowing means oil in water this can be because of several reasons they are as follows;

1. Temperature of the oil. Temp should not be high else water will evaporate and due to this interface will break and purifier start overflowing.
2. size of the gravity disc If the size of the gravity disc is more the oil will leak to the waterside.
3. high throughout is the fuel taken in the purifier is capacity is more in the oil may leak to the water side.

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