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
-Shut off starting air distributor/distributing system power supply
-Shut off safety air supply
-Shut off control air supply
-Shut off air supply to exhaust valve – Only with stopped lubricating oil pumps
-Engage turning gear
-Shut off cooling water
-Shut off fuel oil
-Stop lubricating oil supply
-Lock the turbocharger rotors
-isolate expansion tank than only drain jacket drain jacket cooling water and open purging valve so that air pressure helps in draining.
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.
2. Mount two chains in the inner screw holes in the top of the crankcase, in the athwarthship direction, for suspending the piston rod.
3. Loosen and remove the locking wire from the screws on the piston rod foot. Remove the screws.
4. Mount a lifting eye bolt on each side of the piston rod.
5. Turn the crosshead to TDC.
Hook the chains to the lifting eye bolts in the piston rod. Turn the crosshead downward, and the piston rod will then remain suspended from the two chains.
With piston removed:
6. Turn to BDC.
7. Place the spacer rings around the nuts and screw the hydraulic jacks on to the studs.Loosen the crosshead bearing cap nuts.For operation of the hydraulic jacks Remove the hydraulic jacks and the spacer rings, and unscrew the nuts.
8. Mount the lifting attachments on the head of the connecting rod.
9. Suspend two tackles from the lifting brackets,in the athwarthship direction.
10. Mount the wire guide at the top of the crankcase door frame to prevent damage.Mount two eye bolts in the top of the crosshead bearing cap.
Hook the tackles on to the eye bolts, and remove the bearing cap from the engine.Check the upper part of the journal.
11. Place the bearing cap on one side on a couple of wooden planks. Check the bearing shell.
12. Fasten tackles to the fixed lifting brackets on the frame box wall.
13. Turn the crosshead upwards until the piston rod lands on the crosshead. Ensure that the guide ring in the crosshead fits correctly in the centre hole of the piston rod.Do not remove the chains or lifting eye bolts.
14. Turn to TDC and attach the tackle hooks to the lifting attachments. Haul the tackles tight.
15. Mount the four supports for guide shoes on the crosshead guides. Carefully turn the crank down towards the exhaust side, until the guide shoes rest on the supports. Adjust the support brackets to the guide shoes so that the weight of the crosshead is evenly distributed on the four supports. Haul the tackles tight.
16. Turn the crankthrow carefully towards BDC while ‘following’ with the tackles, thus continuously supporting the connecting rod.
17. With the crosshead resting on the supports,check the lower part of the crosshead journal and the lower bearing shell.
18. In cases where it is necessary to remove the lower bearing shell, tilt the connecting rod towards the doorway on the camshaft side, using the tackles.
-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
-Shut off starting air distributor/distributing system power supply
-Shut off safety air supply
-Shut off control air supply
-Shut off air supply to exhaust valve – Only with stopped lubricating oil pumps
-Engage turning gear
-Shut off cooling water
-Shut off fuel oil
-Stop lubricating oil supply
-Lock the turbocharger rotors
-isolate expansion tank than only drain jacket drain jacket cooling water and open purging valve so that air pressure helps in draining.
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.
2. Mount two chains in the inner screw holes in the top of the crankcase, in the athwarthship direction, for suspending the piston rod.
3. Loosen and remove the locking wire from the screws on the piston rod foot. Remove the screws.
4. Mount a lifting eye bolt on each side of the piston rod.
5. Turn the crosshead to TDC.
Hook the chains to the lifting eye bolts in the piston rod. Turn the crosshead downward, and the piston rod will then remain suspended from the two chains.
With piston removed:
6. Turn to BDC.
7. Place the spacer rings around the nuts and screw the hydraulic jacks on to the studs.Loosen the crosshead bearing cap nuts.For operation of the hydraulic jacks Remove the hydraulic jacks and the spacer rings, and unscrew the nuts.
8. Mount the lifting attachments on the head of the connecting rod.
9. Suspend two tackles from the lifting brackets,in the athwarthship direction.
10. Mount the wire guide at the top of the crankcase door frame to prevent damage.Mount two eye bolts in the top of the crosshead bearing cap.
Hook the tackles on to the eye bolts, and remove the bearing cap from the engine.Check the upper part of the journal.
11. Place the bearing cap on one side on a couple of wooden planks. Check the bearing shell.
12. Fasten tackles to the fixed lifting brackets on the frame box wall.
13. Turn the crosshead upwards until the piston rod lands on the crosshead. Ensure that the guide ring in the crosshead fits correctly in the centre hole of the piston rod.Do not remove the chains or lifting eye bolts.
14. Turn to TDC and attach the tackle hooks to the lifting attachments. Haul the tackles tight.
15. Mount the four supports for guide shoes on the crosshead guides. Carefully turn the crank down towards the exhaust side, until the guide shoes rest on the supports. Adjust the support brackets to the guide shoes so that the weight of the crosshead is evenly distributed on the four supports. Haul the tackles tight.
16. Turn the crankthrow carefully towards BDC while ‘following’ with the tackles, thus continuously supporting the connecting rod.
17. With the crosshead resting on the supports,check the lower part of the crosshead journal and the lower bearing shell.
18. In cases where it is necessary to remove the lower bearing shell, tilt the connecting rod towards the doorway on the camshaft side, using the tackles.
Dismount the locking screws, and turn the bearing shell so far up that an eye bolt can be removed Lift the bearing shell out of the engine.
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