Camshaft Timing Train Components (Engine - Td4) (page 2 of 2)

The oil entering the cylinder block main gallery passes through drillings to the crankshaft main bearings and cross drillings in the crankshaft direct oil to the big-end bearings. An additional four drillings in the cylinder block supply oil at reduced pressure to the lubrication jets for piston and cylinder cooling and gudgeon pin lubrication.

A cross channel from the LH main oil gallery crosses to the RH side of the cylinder block where there is an outlet port which provides a pressurised oil supply to the turbocharger bearings via a banjo connection and external piping.

Riser channels at the front RH side and rear LH side of the cylinder block are used to channel oil to mating ports in the cylinder head and provide a source for cylinder head lubrication and operating pressure for the hydraulic tappets.

Oil is fed through oil galleries at the LH and RH side of the engine and four cross channels from each gallery directs oil to the camshaft bearings. Lubrication oil fed to the tappets passes up through the tappet body to the finger rockers for lubrication of the surfaces between the finger rockers and the camshaft lobes.

Tapered plugs seal the cylinder head main oil galleries at the rear of the cylinder head, and an additional tapered plug is included inside the cylinder head at the front of the RH gallery.

An additional riser channel from the cylinder block LH main oil gallery is used to supply lubrication to the timing chain system through several outlet ports at the front of the cylinder block and cylinder head.