CAA Transporter T5.1 Cylinder Head, 2.0 TDI 03L103373G

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Good condition.

Genuine used Volkswagen Transporter T5.1 2.0 TDI cylinder head, casting / OE reference 03L103373G. This aluminium cylinder head is designed for the Common Rail 2.0 TDI engine family and houses critical upper-engine components including the valves, camshafts, injectors and associated lubrication and cooling passages.

Part Number / Casting Number: 03L103373G

VW OE Reference: 03L 103 373 G

Part Type: Engine Cylinder Head / Cylinder Head Assembly

Engine Type: 2.0 TDI Common Rail

Engine Family: CAA-series

Known Application: CAAA

CAAA Output: 62 kW / 84 PS

Fuel Type: Diesel

Engine Generation: EA189-family 2.0 TDI application

Material: Aluminium Alloy

Manufacturer: Volkswagen / VAG

Condition: Genuine used part

Compatibility

Suitable for selected:

* Volkswagen Transporter T5.1 – 2009/2010–2015

* Volkswagen Caravelle T5.1

* Volkswagen Multivan T5.1

* Volkswagen California T5.1

* Transporter panel van

* Kombi

* Shuttle / passenger versions

* Chassis cab / flatbed versions where the matching engine is fitted

Known engine application:

* CAAA – 2.0 TDI, 62 kW / 84 PS

The 03L103373G casting is also found on other T5.1 2.0 TDI configurations, so it should not be advertised as a CAAA-only cylinder head.

Compatibility must be established by comparing the original cylinder-head casting, engine code and component configuration.

Technical Information

The cylinder head forms the upper section of the engine and seals against the cylinder block using the cylinder-head gasket.

It contains or supports critical engine components including:

* Intake valves

* Exhaust valves

* Valve springs

* Camshafts

* Camshaft bearing surfaces

* Fuel injectors

* Glow plugs

* Intake ports

* Exhaust ports

* Engine oil galleries

* Coolant passages

* Timing-drive components

The cylinder head must maintain an accurate seal between the combustion chambers, lubrication system and engine cooling system.

2.0 TDI Common Rail Cylinder Head Information

The T5.1 CAAA uses Volkswagen’s Common Rail diesel injection system.

Unlike the earlier T5 1.9 TDI PD engines, the Common Rail engine does not use unit injectors driven directly from the camshaft.

The cylinder head is designed around the Common Rail injector arrangement and associated 2.0 TDI valve train.

Correct cylinder-head condition is critical for:

* Compression

* Combustion sealing

* Valve operation

* Camshaft alignment

* Injector installation

* Engine lubrication

* Coolant circulation

* Exhaust and intake sealing

Common Reasons for Cylinder Head Replacement

Typical reasons for replacing a cylinder head include:

* Cracked cylinder head

* Overheating damage

* Warped head surface

* Cylinder-head gasket failure

* Coolant loss

* Compression loss

* Damaged valve seats

* Bent or damaged valves

* Camshaft/bearing damage

* Injector bore damage

* Damaged glow plug threads

* Damaged injector threads or mounting points

* Internal coolant/oil leakage

* Previous timing-system failure

Common Symptoms of Cylinder Head Problems

Potential symptoms can include:

* Coolant loss

* Cooling system becoming excessively pressurised

* White exhaust smoke

* Engine overheating

* Poor compression

* Difficult starting

* Rough running

* Misfire

* Oil contamination in coolant

* Coolant contamination in engine oil

* Combustion gases entering the cooling system

* Excessive pressure in the coolant expansion tank

These symptoms do not automatically confirm a failed cylinder head.

A head gasket, EGR cooler, cooling-system component or other engine fault can sometimes produce similar symptoms.

Important Diagnostic Information

Before replacing the cylinder head, professional diagnosis is strongly recommended.

Useful checks can include:

* Compression test

* Cylinder leak-down test

* Cooling-system pressure test

* Combustion-gas test of coolant

* Injector testing

* Inspection for external coolant leakage

* Oil/coolant contamination inspection

* EGR cooler testing

* Cylinder-head flatness measurement

If the engine has overheated severely, the cylinder head should be checked for both distortion and cracking.

Pressure Testing & Skimming

A used cylinder head should ideally be professionally inspected before installation.

Depending on its condition, an engine machine shop may recommend:

* Pressure testing

* Crack testing

* Surface flatness measurement

* Skimming/resurfacing where permitted

* Valve inspection

* Valve-seat inspection

* Valve-guide inspection

* Camshaft/bearing inspection

Do not assume that a used cylinder head is ready to install unless it has specifically been advertised as tested/reconditioned.

If this particular head has not been pressure tested or skimmed, it should be sold as a genuine used cylinder head rather than described as reconditioned.

Cylinder Head Gasket Information

A new cylinder-head gasket should be used during installation.

Correct gasket specification/thickness must be selected according to the engine and piston protrusion/manufacturer procedure.

The old head gasket should never be reused.

The mating surfaces of both the cylinder head and engine block should be inspected carefully before assembly.

Cylinder Head Bolts

Cylinder-head bolts are subjected to significant clamping loads.

Where Volkswagen specifies torque-to-yield / stretch bolts, new cylinder-head bolts should be installed rather than reusing the old bolts.

The correct VW tightening sequence, torque stages and angular tightening procedure must be followed.

Timing System Information

Cylinder-head replacement requires disturbance of the engine timing system.

Correct camshaft-to-crankshaft timing is essential.

During installation:

* Use the appropriate locking tools

* Set the engine to the specified timing position

* Follow the VW timing procedure

* Inspect the timing belt

* Inspect tensioners and rollers

* Inspect the water pump where applicable

* Confirm timing before starting the engine

If the existing timing components have significant mileage or uncertain history, replacing the timing-belt kit and water pump during cylinder-head work is generally sensible.

Valve & Piston Damage

If cylinder-head replacement is required following a timing-belt failure, do not assume the damage is limited to the cylinder head.

Inspect:

* Pistons

* Connecting rods where appropriate

* Valves

* Valve guides

* Camshafts

* Rocker/follower components

* Cylinder bores

Valve-to-piston contact can cause additional internal engine damage.

Injector Information

The Common Rail injectors mount into the cylinder head.

When transferring injectors:

* Keep components clean

* Inspect injector bores

* Replace required injector seals

* Use correct mounting hardware

* Follow the specified tightening procedure

Injectors should be installed according to VW repair information.

Depending on what components are changed, injector calibration/correction information may also need to be checked through diagnostic equipment.

Installation

Cylinder-head replacement is a major engine repair and should ideally be carried out by an experienced technician.

Installation normally requires:

* Removal of intake components

* Removal of exhaust/EGR components

* Removal of fuel-system components

* Removal of injectors where required

* Timing-system removal

* Camshaft/timing preparation

* Cooling-system draining

* Cylinder-head removal

* Block surface inspection

* New head gasket

* New required single-use fasteners

* Correct timing setup

* Cooling-system refill and bleeding

* Engine oil/filter service where appropriate

All mating surfaces must be clean and prepared according to manufacturer specifications.

Programming / Coding

The bare cylinder head itself requires no programming or coding.

However, diagnostic work may be necessary after installation depending on which fuel-system or electronic components have been removed or replaced.

Stored engine fault codes should be checked after the repair.

Important Compatibility Note

Please compare before ordering:

* Cylinder-head number – 03L103373G

* Engine code

* CAA engine-family configuration

* Injector arrangement

* Camshaft configuration

* Intake and exhaust port arrangement

* Sensor mounting points

* EGR connections

* Coolant connections

* Production date

* Components included with the head

03L103373G should not be assumed to fit solely because the vehicle is a Transporter T5.1 2.0 TDI.

Several 2.0 TDI engine codes and cylinder-head revisions were used during T5.1 production.

Matching the 03L103373G casting/reference and confirming compatibility against the engine code or VIN is strongly recommended.

Condition

Genuine Volkswagen used engine component.

Unless specifically stated otherwise, this should be considered a used cylinder head and not a remanufactured/reconditioned unit.

Normal signs of previous use may include:

* Oil residue

* Carbon deposits

* Coolant staining

* Surface marks

* Oxidation

* General workshop/removal marks

Please inspect all listing photographs carefully to determine exactly which components are included, such as camshafts, valves, injectors, sensors, brackets or other ancillary parts.

Professional inspection, pressure testing and measurement are recommended before installation unless documented testing has already been carried out.

Any identifying colour/security markings applied to the part must remain intact in the event of a return.

Ideal genuine replacement for a cracked, warped or damaged Volkswagen Transporter T5.1 2.0 TDI CAAA / CAA-family cylinder head, provided 03L103373G and the engine configuration match the original unit.