Overhauling of Cylinder head

Cylinder head assembly comprises of following parts.

• Inlet valve.
• Exhaust valve.
• Start air inlet valve.
• Fuel injector.
• Combined indicator and relief valve.
• Rocker arm assembly.

• Before overhauling, take off the top and bottom cover from the cylinder head.

• The cylinder head assembly is connected to exhaust manifold, scavenge manifold, cooling water system, starting air system, and fuel oil high pressure pipe.

• To take out the cylinder head for overhaul remove the scavenge and exhaust manifolds.

• Remove all the pipes connected to the cylinder head.

• Remove the Rocker arm holder.

• Take out the valve Yokes, push rods, and the protective tubes.

• Remove indicator valve and fuel injector.
• Hydraulically tightened nuts hold the cylinder head.

• Place the jack mounts on the nuts.
• Tighten the jacks on the  studs fully and open half turn.
• Connect high pressure hose.

• Operate the hydraulic pump and purge the air through the air vent plug.

• Operate the hydraulic pump and increase to the prescribed pressure.
• Slacken the nuts using the Tommy bar through the opening in the mount.

• Take off the hydraulic Jack mounts and unscrew the cylinder cover nuts.
• Lift the the cylinder head clear from the the top face of the liner, using appropriate lifting tool.