Cylinder head components (Engine - Td5)

Crankshaft

1 Front end to crankshaft sprocket 2 Oil supply cross-drillings 3 Main journals 4 Big-end journals 5 Rear end to flywheel

The crankshaft is constructed from cast iron and is surface-hardened. The areas between the crankshaft journals and the adjoining webs and balance weights are compressed using the cold roll process to form journal fillets.

Cross-drillings in the crankshaft between adjoining main and big-end bearings are used to divert lubrication oil to the big-end bearings.

A torsional vibration damper is attached to the crankshaft pulley by three bolts.

The crankshaft is carried in six main bearings, with end-float being controlled by thrust washers positioned on both sides of No. 3 main bearing.

Main bearings There are six main bearings used to carry the crankshaft. Each of the bearing caps are of cast iron construction and are attached to the cylinder block by two bolts.

The bearing shells are of the split cylindrical type. The upper half bearing shells are grooved to facilitate the supply of lubrication oil to the bearings and fit into a recess in the underside of the cylinder block. The lower half bearing shells are smooth and fit into the bearing caps.

Steel-backed thrust washers are included at each side of No. 3 main bearing to control crankshaft end-float. One side of each of the thrust washers is grooved, the grooved side of each of the thrust washers is fitted facing outward from No. 3 main bearing.

Cylinder head components

The cylinder head components are described below:

Cylinder head The cylinder head is of aluminium construction. It is not possible to reface the cylinder head if it becomes worn or damaged. An alloy camshaft carrier is bolted directly to the upper surface of the cylinder head. Two dowels are included in the cylinder head upper face for correct location of the camshaft carrier.

The EU3 cylinder head has a single internal fuel rail for delivering fuel to the injectors and an external fuel pipe for returning spill fuel back to the fuel connector block. Therefore, pre EU3 and EU3 model cylinder heads are not interchangeable.

CAUTION: The cylinder head incorporates drillings for the fuel injection system, any contamination which enters these drillings could cause engine running problems or injector failure. It is therefore, essential that absolute cleanliness is maintained when carrying out work on the cylinder head.