11
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VGT oil return port
12
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VGT oil supply port
The cylinder block is manufactured from cast-iron and features double layer walls that provide high strength and rigidity.
An air cushion is formed between the layers and also acts to reduce the NVH levels produced by the engine. The block
features 5 bolted main bearing journals that also provide high strength and rigidity to the lower end of the engine.
The cylinders are directly bored into the cylinder block and do not require cylinder liners. Two guide sleeves are located in
the cylinder block, and provided to correctly align the cylinder head and gasket to the cylinder block.
A hole formed in the LH rear of the cylinder block below the starter motor, provides the location for an engine timing
special tool. When inserted, the special tool locates in a corresponding hole in the flywheel to temporarily hold the
crankshaft with No. 1 piston at the Top Dead Center (TDC) position.
The oil filter and cooler housing, and main oil gallery are located on the LH side of the cylinder block. The main oil gallery
is a longitudinal drilling that runs the length of the cylinder block, and supplies pressurized oil to all the engine moving
components. Pressurized oil is diverted from the main oil gallery to supply the main and big-end bearings via diagonal oil
drillings in the cylinder block, and in the crankshaft journals. The main oil gallery is sealed at each end with a screwed
plug.
A cross drilling above No. 2 main bearing directs pressurized oil from the main oil gallery to a port at the Right-Hand (RH)
side of the cylinder block. The port supplies pressurized oil via a banjo type connection to the VGT bearings. Return oil
from the VGT is directed via a pipe and a connection at the RH side of the block, into the oil pan. A vertical drilling at the
LH front of the cylinder block supplies pressurized oil from the main oil gallery, up to a corresponding oil gallery in the
cylinder head.
Engine cooling is achieved with inter-cylinder coolant chambers and expansion chamber drillings, formed in the cylinder
block coolant jacket. The coolant chambers direct coolant through openings in the block upper surface to the cylinder head.
Core plugs seal the exterior openings formed in the cylinder block coolant jacket.
Oil Spray Jets