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SECTION 303-01D: Engine — 2.3L
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2003 Focus Workshop Manual
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DESCRIPTION AND OPERATION
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Procedure revision date: 01/24/2003
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The 2.3L engine is a four valve-per-cylinder, dual overhead camshaft engine. The engine uses a coil-on-plug ignition system. The cylinder block is made of aluminum and the bearing caps are integrated into the ladder assembly. An aluminum oil pan bolts to the bottom of the lower cylinder block and to the transmission to provide greater strength. The camshafts are mounted in the cylinder heads and act against valve tappets to open and close the valves. The camshafts are driven off the front of the cylinder head by one timing chain. The chain is driven by a sprocket that is located on the crankshaft. The piston assembly is an aluminum piston with a cast iron connecting rod. The oil pump is driven by the crankshaft via a dedicated chain that is driven by the same sprocket that drives the timing chain.
| Item | Part Number | Description |
|---|---|---|
| 1 | 6010 | Cylinder block |
| 2 | 6K318 | Crankshaft rear oil seal and retainer |
| 3 | 6477 | Flywheel |
| 4 | 6675 | Oil pan |
| 5 | 6714 | Oil filter |
| 6 | — | Oil filter adapter |
| 7 | 9278 | Oil pressure sensor |
| 8 | 6A785 | Positive crankcase ventilation (PCV) valve |
| 9 | 8575 | Thermostat assembly |
| 10 | 6622 | Oil pump screen and pickup tube |
| 11 | — | Balancer assembly |
| Item | Part Number | Description |
|---|---|---|
| 1 | 6C348 | Drive belt pulley idler (without A/C) |
| 2 | 8620 | Accessory drive belt (without A/C) |
| 3 | 19D629 | A/C compressor |
| 4 | 8620 | Accessory drive belt (with A/C) |
| 5 | 6316 | Crankshaft damper |
| 6 | 6C315 | Crankshaft position sensor |
| 7 | 6A340 | Crankshaft pulley bolt |
| 8 | 10300 | Generator |
| 9 | 3A674 | Power steering pump |
| 10 | 8501 | Coolant pump |
| 11 | 19A216 | Drive belt pulley idler (with A/C) |
| 12 | 6B209 | Drive belt tensioner |
| 13 | 6019 | Engine front cover |
| 14 | 6306 | Crankshaft sprocket |
| 15 | 6K254 | Timing chain tensioner |
| 16 | 6K255 | Timing chain tensioner arm |
| 17 | 6268 | Timing chain |
| 18 | 6K297 | Timing chain guide |
| 19 | 6A895 | Oil pump chain |
| 20 | 6C271 | Oil pump chain tensioner |
| 21 | 6659 | Oil pump-to-cylinder block gasket |
| 22 | 8597 | Coolant bypass tube |
| 23 | 6600 | Oil pump |
| 24 | 6M256 | Oil pump chain guide |
| 25 | 6652 | Oil pump drive gear |
| 26 | 6010 | Cylinder block |
| Item | Part Number | Description |
|---|---|---|
| 1 | 12A366 | Coil-on-plug assembly |
| 2 | 6M293 | Valve cover |
| 3 | 12K073 | Camshaft position (CMP) sensor |
| 4 | 6766 | Oil filler cap |
| 5 | 6M293 | Valve cover gasket |
| 6 | — | Camshaft bearing caps |
| 7 | 6A272 | Camshaft (exhaust) |
| 8 | 6A271 | Camshaft (intake) |
| 9 | 6500 | Valve tappet (16 req'd) |
| 10 | 6518 | Valve spring retainer key (16 req'd) |
| 11 | 6514 | Valve spring retainer (16 req'd) |
| 12 | 6513 | Valve spring (16 req'd) |
| 13 | 6A517 | Valve stem seal (16 req'd) |
| 14 | 6G004 | Cylinder head temperature (CHT) sensor |
| 15 | 12405 | Spark plug (4 req'd) |
| 16 | 6065 | Cylinder head bolt (10 req'd) |
| 17 | 6049 | Cylinder head |
| 18 | 6505 | Exhaust valve (8 req'd) |
| 19 | 6507 | Intake valve (8 req'd) |
| 20 | 6051 | Head gasket |
| 21 | 6010 | Cylinder block |
| 22 | 6C251 | Camshaft sprocket (2 req'd) |
| 23 | — | Exhaust manifold gasket |
| 24 | Exhaust manifold | |
| 25 | 17K004 | Engine lifting eye |
| Item | Part Number | Description |
|---|---|---|
| 1 | — | High pressure fuel tube (supply) |
| 2 | — | Coolant outlet adapter assembly |
| 3 | 9D475 | Exhaust gas recirculation (EGR) valve |
| 4 | 9E926 | Throttle body assembly |
| 5 | 6051 | Cylinder head gasket |
| 6 | 6010 | Cylinder block |
| 7 | 12A699 | Knock sensor |
| 8 | 6754 | Oil level indicator and tube assembly |
| 9 | 9F715 | Idle air control (IAC) valve assembly |
| 10 | 9424 | Intake manifold |
| 11 | 9J559 | Engine air shutoff control assembly |
| 12 | — | Intake manifold gasket |
| 13 | — | Coolant hose |
| 14 | 6049 | Cylinder head |
| 15 | 9F593 | Fuel injector (4 req'd) |
| 16 | 9H487 | Fuel injection supply manifold |