1
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Positive crankcase ventilation (PCV) valve
The valve cover is made of plastic. The valve cover incorporates the crankcase breather valve and the oil filler cap.
The seal between the valve cover and the upper part of the cylinder head is provided by means of a separate gasket with a rubber profile.
Before installing the valve cover, check the gasket for damage and install a new one if necessary.
Cylinder head gasket
NOTE:Refer to the current service literature for details on the selection of the correct cylinder head gasket and the installation procedure.
The cylinder head gasket is a laminated multi-layered metal gasket.
Five different thicknesses are available to permit exact matching of the gasket to the particular piston protrusion of the engine.
The different thicknesses are indicated with one to five notches on the side of the cylinder head gasket.
Cylinder head, upper part
3
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Mountings for the injectors
4
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Camshaft oil supply bore
7
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Chain tensioner oil supply bore
The cylinder head comprises two separate parts. This particular layout provides greater strength for the overall construction.
The camshafts are inserted into the upper part of the cylinder head and secured by means of the camshaft bearing caps. The upper part of the cylinder head is placed on the lower part of the cylinder head and then bolted down.
In addition, the chain tensioner is secured by means of two retaining bolts to the housing of the upper part of the cylinder head and is connected to the oil circuit of the engine via an oil duct (8) on the sealing face of the upper part of the cylinder head.
The oil supply to the camshafts is also provided via an oil duct (5) located on the sealing face of the upper part of the cylinder head.
The ducts for the intake manifold and the mountings for the injectors are located in the upper part of the cylinder head.
Cylinder head, lower part
1
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Hole for alignment sleeve
NOTE:When joining the two parts of the cylinder head, care must be taken to ensure that the oil supply bores are not closed off with sealant.
NOTE:Refer to the current service literature for the exact procedure and the correct tightening torques.
The upper and lower parts of the cylinder head are held exactly in position using two locating sleeves.
The cylinder head features top-entry intake ports.
The intake ports are on the right in the cylinder head (towards the rear of the engine when viewed from the rear of the vehicle) and the exhaust ports are on the left in the cylinder head (towards the front of the engine when viewed from the rear of the vehicle).
Guide bushes for the installation of the injectors are also located here.
The hydraulic tappets are connected to the oil circuit of the engine via the oil duct (3).
Both parts of the cylinder head are sealed using a one-component, silicone-based sealant when they are joined together.
Camshaft drive
1
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Intake camshaft timing pulley
3
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Intake camshaft sprocket
4
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Exhaust camshaft sprocket
6
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Bore for crankshaft timing peg
9
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Fuel pump timing pulley
The intake camshaft is driven by the crankshaft via a timing belt. The exhaust camshaft is driven by the intake camshaft via a timing chain.
The timing belt has an automatic, spring loaded pulley tensioner.
The installation positions of the timing pulley on the intake camshaft and the timing pulley on the crankshaft are defined by a Woodruff key.
Special tools must be used for adjusting the valve timing. Refer to the current service literature for the exact procedure.
As is shown in the illustration, timing bores are located on the intake camshaft timing pulley, the crankshaft timing pulley and on the fuel pump timing pulley, and these need to be aligned with the respective opposite bores on the engine.
In this position the intake camshaft timing pulley, the crankshaft timing pulley and the fuel pump timing pulley are each secured by means of a timing peg (special tool).
Camshafts
Both camshafts run without additional bearing shells on five mountings in the upper part of the cylinder head.
The exhaust camshaft directly drives the vacuum pump, which engages in a groove on the connecting flange of the camshaft.
The sprockets are shrunk-fit onto the shaft spigots. Each of the two sprockets has two thrust surfaces for axial guidance of the camshafts.
The sprockets and thrust surfaces are made as a single component. The axial guidance of the camshafts is achieved by inserting the camshafts into the corresponding recesses in the upper part of the cylinder head.
Timing chain
Timing marks are stamped onto the camshaft sprockets in order to assist with the adjustment of the valve timing. During installation these marks must be brought into alignment with the marks on the timing chain links.
The installation position of the intake camshaft timing pulley is defined by a Woodruff key.
The timing chain tensioner should be inserted into the upper part of the cylinder head between the two runs of the timing chain before the camshafts are installed. It is not possible to install it at a later stage.
Timing chain tensioner
The cylinder head is equipped with 4 valves per combustion chamber. The valve seats and guides are made of sintered steel.
The injectors are arranged centrally in the combustion chamber. The pencil-type glow plugs are located on the exhaust side (behind the engine when looking towards the front of the vehicle) and protrude laterally into the combustion chamber.
The valves are actuated via roller cam followers, and the adjustment of the valve clearance is performed via hydraulic tappets.
Cylinder block
1
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Sequential engine serial number
The engine identification is located on the exhaust side (between cylinders no. 1 and no. 2) on the cylinder block.
In addition, the VIN (vehicle identification number) and the engine code are located on the exhaust side on the transmission flange.
As a result of the revised bore and stroke in comparison to the 1.4L Duratorq TDCi (DV4) engine, the bore diameter and the cylinder block height have changed.
Pistons
1
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Arrow marking indicating the correct orientation for installation
2
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Weight classification marking
The pistons are made of light metal alloy and each has a recess machined centrally in the crown.
Four valve pockets are worked into each piston crown.
The pistons are available in four different weight classes.
The arrow (1) on the piston crown indicates the correct orientation for installation, and it must point towards the timing end of the engine when the pistons are installed.
The piston pin is a floating fit and is held in position by two snap rings.
Connecting rod
Due to the increase in engine torque over the 1.4L Duratorq TDCi (DV4) engine, the compression pressures have also increased.
The connecting rod shafts have also been lengthened and strengthened.
The connecting rods are fracture-split, which ensures a perfect fit between the two parts.
The pairs of connecting rods and connecting rod bearing caps must be kept together during installation.