Ford Galaxy / Ford S-MAX. Manual — part 255

Description

Timing belt pulley - exhaust camshaft

Timing chain tensioner

Exhaust camshaft sprocket

Inlet camshaft sprocket

The timing chain tensioner is attached to the upper part of the cylinder head, between the
camshaft sprockets.

Two securing bolts are used to secure the chain tensioner.

Description

Timing chain tensioner housing

Spring

Timing chain guide

Oil bore

The timing chain guide is made of plastic.

Timing chain guide wear is compensated for by a spring loaded timing chain tensioner.

Because the timing chain tensioner is connected to the engine oil supply circuit, the
components are lubricated and chain noise is reliably prevented.

A second timing chain guide is attached to the cylinder head lower section.

Timing chain

Item

1

2

3

4

Item

1

2

3

4

Part Number

-

-

-

-

Part Number

-

-

-

-

Part Number

Description

Exhaust camshaft

Inlet camshaft

Bright chrome-finished chain links

Markings on the sprockets

The inlet camshaft is driven via a timing chain.

The timing chain is tensioned using an automatic chain tensioner.

The timing chain has two bright chrome-finished chain links (A). When installed, these two
markings must align with the arrow marks (B) on the sprockets.

Pistons and piston rings

Description

Upper compression ring

Lower compression ring

Oil scraper ring

The light alloy pistons have a combustion chamber incorporated into the centre of the piston
crown. This optimises swirling of the fuel/air mixture.

Two recesses are incorporated into each piston crown.

In order to minimise friction, particularly during the running-in phase, the piston stem has a
graphite-based coating.

The piston pin is a floating fit and is held in position by two snap rings.

Cylinder block

Item

1

2

(A)

(B)

Item

1

2

3

-

-

-

-

Part Number

-

-

-

NOTE: Refer to the current service literature for the exact procedure and the correct
measurements for machining.

The cylinder block is made of cast iron and has no cylinder liners.

The running surfaces of the cylinders are worked directly into the cylinder block.

The mating face of the cylinder block with the cylinder head can be re-worked.

Two holes are provided in the cylinder block, for the guide sleeves used to secure the
cylinder head gasket.

Connecting rods

Description

Big-end bearing shells

NOTE: Refer to the current service literature for the exact procedure and the correct
tightening torques for installing the big end bearings.

The connecting rods are made of forged steel.

The big-end bearing caps are cut and machined at the joins to the connecting rod.

The big end bearing shells have retaining lugs to prevent radial movement.

The retaining nuts are tightened in three stages. In the third stage the nuts are tightened
to a specified angle.

The connecting rods and big-end bearing caps are paired and must not be mixed up.

Crankshaft main bearings

Item

1

Part Number

-

Description

Colour marking

Marking

Barcode

Alphanumerical code

Thrust washers

Marking

For accurate adjustment of the crankshaft bearing clearance, the crankshaft bearing shells
in the crankshaft main bearing caps are available in five different thicknesses.

The upper crankshaft main bearings (cylinder block side) are only available in one
thickness.

Marks on the cylinder block (1) and on the crankshaft (timing side) (4) indicate the
thicknesses of the crankshaft bearing shells installed.

The barcode (2) is for production and the alphanumeric code (3) for service operations.

Retaining lugs on the crankshaft bearing shells prevent radial movement.

NOTE: The crankshaft main bearing caps must be installed in the correct position.
NOTE: Cylinder 1 is located on the transmission side.

Item

A

1

2

3

4

5

Part Number

-

-

-

-

-

-