Ford Galaxy / Ford S-MAX. Manual — part 254

The valve cover and the inlet manifold form one assembly and are made of plastic.

The PCV valve is also located on the valve cover.

It is sealed off from the cylinder head with a separate seal.

The cylinder head's intake ports and injector ports are each sealed off from the inlet
manifold by four sealing rings.

NOTE: Refer to the current service literature for precise details of how to assemble the
valve cover and inlet manifold.

Before re-installing the valve cover and the inlet manifold, carefully check the sealing rings
for damage and renew if necessary.

Cylinder head

Description

Seal

Exhaust camshaft

Inlet camshaft

Alignment sleeves

Timing chain

The aluminium cylinder head has four valves per combustion chamber. The valve seats and
guides are made of sintered steel.

The inlet ports are located on the front of the cylinder head, the exhaust ports at the back
(with respect to the direction of travel).

Item

1

2

3

4

5

Part Number

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Description

Inlet ports

Cylinder head upper part

Cylinder head lower part

Oil supply hole

NOTE: The upper and lower parts of the cylinder head are matched to each other and
cannot be renewed separately.
NOTE: It is important to ensure that the oil supply holes are not blocked by sealant when
the two parts of the cylinder head are brought together.

The cylinder head is made of two separate parts. This special design ensures that the
overall structure is stronger.

The upper and lower parts of the cylinder head are milled in a single operation and are
accurately positioned with two alignment sleeves.

The lower part of the cylinder head is bolted to the cylinder block.

The upper halves of the camshaft mountings are incorporated into the upper part of the
cylinder head. Here the camshafts run directly in aluminium, without additional bearing
shells.

The upper part of the cylinder head features top-entry intake ports.

The two individual parts are sealed using a one-component, silicone-based sealant when
they are joined together.

Valve train

Item

1

2

3

4

Part Number

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-

-

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Description

Exhaust camshaft

Inlet camshaft

Roller cam follower

Hydraulic tappet

The inlet valves are made entirely of one material. The heads and stems of the exhaust
valves are manufactured from different materials and are joined to one another by means
of friction welding.

By using roller followers, it has been possible to keep valve actuation friction losses low.

Valve clearance adjustment is done automatically by the hydraulic tappets. As a result,
there is no need to adjust the valve clearances.

The hydraulic tappets are connected with the engine's oil circuit by oil ports cast into the
cylinder head.

Camshafts

Description

Exhaust camshaft

Drive - fuel pump

Item

1

2

3

4

Item

1

2

Part Number

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-

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Part Number

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Drive - vacuum pump

Inlet camshaft

The inlet and exhaust camshafts are made from steel tubes. The cams and ends of the
camshaft are shrunk on.

Each camshaft runs directly in aluminium in five bearings, without additional bearing shells.

The vacuum pump is flange-mounted onto the rear of the inlet camshaft and is driven
directly.

The fuel pump is flange-mounted onto the rear of the exhaust camshaft and is also driven
directly.

Camshaft drive

Description

Bore for timing peg

Idler pulley

Crankshaft timing pulley

Coolant pump pulley

Tensioning pulley

NOTE: A spacer shim is located between the cylinder block and the idler pulley (2); this
must be re-fitted when carrying out installation work.

The exhaust camshaft is driven by a toothed belt. The toothed belt also drives the coolant
pump.

The toothed belt drive has an automatic tensioning pulley. The tensioning pulley operates
by spring force.

A feather key specifies the installation position of the exhaust camshaft timing pulley and
the crankshaft timing pulley.

A hole is located on the exhaust camshaft timing pulley into which can be inserted the
timing pin (special tool) to adjust the timing.

Timing chain tensioner

3

4

Item

1

2

3

4

5

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Part Number

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-

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