Main bearing dismantling procedure breifly

Procedures are different for main bearings and thrust shaft end journal bearing.( cross head for neighboring cylinder in higher position) Remove the lubricating pipe and turn the piston 80 degree after tdc, connect the pulleys for taking the bearing keep without touching the bearing studs. Mount tackles at different position outside the engine and also attach the wire guide at the door way. Connect the double hyd jack for removing hydraulic nuts. Loosen and remove the bearing studs. Remove the bearing keep by attaching the lifting tool and using the attached tackles and pulleys. Remove top shell by using the tool. If crankshaft need to be turned without bearing cap use stoppers to restrict the motion of bottom bearing shell. LIFT THE CRANKSHAFT BY 0.2MM by using the cross piece kept between to adjacent transverse girders of bed-plate and lift crank-web using hydraulic jacks.  Now check for clearance for lofting , if insufficient clearance, use 5 ton jack-bolts at required position to lift or move crankshaft radially for making clearances. Now by using the dismantling tool in a such a way that flap of tool aligns with the lubricating oil groove and slide it on top of the journal and remove using the tool used for removing top shell.