Camshaft cover and engine cover components (Engine - Td5)

Camshaft cover and engine cover components

The camshaft cover and engine cover components are described below:

Camshaft cover The camshaft cover is cast from aluminium alloy and is fixed to the camshaft carrier/cylinder head assembly by 13 bolts. The cover has spacers and sealing washers inserted into each of the thirteen bolt holes.

A breather hose is connected to a port at the top of the camshaft cover by means of a hose clip which vents crankcase gases back to the air intake via a breather valve in the air intake tract, located forward of the turbocharger in the flexible air intake duct.

A rubber seal is fitted between the camshaft cover.

An oil filler aperture is included in the top of the camshaft cover, which is sealed with a plastic cap with integral rubber seal.

Camshaft timing chain components

The timing chain cover and timing chain components are described below:

Timing chain cover The timing chain cover is cast and machined aluminium alloy and is attached to the cylinder head by a bolt at the RH top of the cover and by a stud and nut at the LH top of the cover. Eight screws are used to attach the timing chain cover to the front of the engine block. The timing cover is located to the cylinder block front face by two dowels.

A viscous fan is attached to an idler pulley at the front of the engine block. The fan bearing is located on a shaft and held in place by a circlip and a bearing flange, the inner race of the fan bearing is an interference fit on the shaft. The fan idler pulley is attached to the bearing hub by three bolts, and the fan itself is secured to the pulley and bearing shaft by a left hand threaded nut. COOLING SYSTEM - Td5, DESCRIPTION AND OPERATION, Description.

The front of the crankshaft passes through a hole in the lower part of the timing cover. An oil seal is pressed into a recess in the front of the timing cover to seal the interface between the front of the crankshaft and the timing cover.

A stub pipe is fitted to the front RH side of the timing cover which is used to attach the oil drain pipe from the vacuum pump by means of a hose and spring clip.

Timing chains The timing chain between the camshaft and crankshaft sprockets is a duplex type, each chain having 56 links. The timing chain is contained between a fixed plastic guide and an hydraulically adjustable plastic tensioner arm which are attached to the front of the engine block.

To cope with higher injection loads of the EU3 engine, the timing drive between the camshaft and crankshaft has been upgraded. This requires thicker chain links to be used, therefore, the individual pre EU3 and EU3 components are not interchangeable.

To distinguish between the two timing chains the links are different colours. A pre EU3 chain has blue links and a EU3 chain has bronze links.

The oil pump timing chain is a single type and traverses the oil pump sprocket and the rear crankshaft sprocket.

The timing chains are oil lubricated, with oil being provided by a chain lubrication jet and from oil flow returning back to the sump from the cylinder head. An oil hole is included at the front left hand side of the cylinder head which supplies oil from the cylinder head oil galleries.