Jaguar XJS XJ6 XJ40 I6 3.6 4.0 Engine Oil Cooler Adapter EAC3669PA

#102

Genuine used Jaguar XJS / XJ6 / XJ40 Engine Oil Filter Housing & Oil Cooler Adapter, part number EAC3669PA, for selected Jaguar 3.6 and 4.0-litre inline 6-cylinder petrol engines.

This aluminium housing mounts to the engine and provides the mounting point for the engine oil filter while also incorporating the oil-flow passages associated with the engine lubrication and oil-cooler system.

Part Details

Part Number: EAC3669PA

Jaguar OE Reference: EAC3669 / EAC3669PA

Part Type: Engine Oil Filter Housing / Oil Filter Head / Oil Cooler Adapter

System: Engine Lubrication / Oil Cooling System

Engine Type: Inline 6-Cylinder Petrol

Engine Family: AJ6 / related AJ16 applications

Material: Cast Aluminium

Manufacturer: Jaguar

Condition: Used Genuine Part

Compatibility

Suitable for selected Jaguar models including:

* Jaguar XJ40 / XJ6

* Jaguar XJS / XJ-S

* Selected later XJ6 applications using the compatible inline-six engine and oil-filter arrangement

Engine Compatibility

Documented applications include:

3.6 I6 Petrol – AJ6

4.0 I6 Petrol – AJ6 / AJ16-related applications

The exact EAC3669PA number is documented on Jaguar XJ40/XJS 3.6-litre applications and is also found on 4.0-litre XJ6 and XJS vehicles.

This makes the part particularly relevant for late XJ40 and facelift XJS models using Jaguar’s inline-six engine family.

Technical Information

The oil filter housing is an important part of the engine lubrication system.

Engine oil is circulated under pressure by the oil pump and routed through the lubrication system to protect components such as:

* Crankshaft bearings

* Connecting rod bearings

* Camshaft components

* Cylinder head lubrication points

* Timing components

* Other internal engine surfaces

The EAC3669PA housing provides the mounting interface for the replaceable engine oil filter and contains internal oil passages that route engine oil through the appropriate filtration and cooling circuits.

Oil Filter & Oil Cooler System Information

Depending on vehicle specification, the housing works with components including:

* Engine oil filter

* Engine oil pump

* Oil cooler

* Oil cooler feed and return hoses

* Oil pressure / bypass components

* Engine block oil galleries

* Seals and gaskets

* Threaded oil cooler connections

On oil-cooler-equipped vehicles, the housing provides the interface between the engine lubrication circuit and the external oil-cooling system.

Hot engine oil can be routed through the cooler circuit before returning to the engine lubrication system.

This helps maintain a suitable engine-oil operating temperature, particularly during sustained engine load and higher-temperature operation.

Common Reasons for Replacement

Replacement may be required because of:

* Cracked housing

* Damaged oil-filter mounting threads

* Damaged oil cooler connections

* Corrosion around hose fittings

* Oil leakage

* Damaged sealing surface

* Previous incorrect repair

* Stripped mounting threads

* Accident or engine damage

* Damaged internal passages

* Housing damaged during engine removal or servicing

Possible Symptoms / Problems

Problems associated with the housing or its seals may include:

* Engine oil leakage

* Oil collecting around the filter housing

* Leakage around oil cooler connections

* Persistent oil loss

* Oil contamination around the side of the engine

* Damaged or insecure oil filter

* Difficulty sealing the oil filter correctly

* Leakage after an oil-filter change

Oil leakage in this area does not automatically mean the aluminium housing itself has failed.

Seals, gaskets, cooler hoses and fittings should also be inspected.

Important Diagnostic Information

Before replacing the housing, inspect:

* Oil filter and filter sealing surface

* Housing-to-engine gasket/seal

* Oil cooler hose connections

* Oil cooler hoses

* Threaded fittings

* Housing for cracks

* Mounting bolt threads

* Oil pressure components where applicable

* Oil cooler itself

Clean the surrounding area before diagnosis where possible, as engine oil can travel along the block and make the source of a leak difficult to identify.

Installation

This is a mechanical engine lubrication component.

During installation:

* Clean all mating surfaces

* Inspect the housing for contamination

* Use the correct replacement gasket/seals

* Inspect oil cooler hose fittings

* Ensure oil passages remain clean

* Tighten mounting hardware to the appropriate specification

* Install the correct engine oil filter

* Refill/check engine oil as required

After installation, start the engine and carefully inspect the housing, oil-filter seal and cooler connections for leakage.

Correct engine oil pressure should be confirmed if there were previous lubrication-system concerns.

Programming / Coding

No programming or coding required.

This is a mechanical engine lubrication component.

Related Part Number Information

Main Part Number: EAC3669PA

Base Reference: EAC3669

Another number frequently associated with later Jaguar inline-six oil-filter housing applications is:

EBC4124PA / EBC4124

EBC4124PA is advertised alongside EAC3669PA for some later XJ6/XJ40/X300 4.0 applications.

However, these numbers should not automatically be treated as interchangeable without comparing the housing, oil passages, cooler connections and vehicle specification.

Important Compatibility Note

Jaguar used different oil-filter housing and oil-cooler arrangements depending on engine, production year and vehicle specification.

Before purchasing, please compare:

Part Number: EAC3669PA / EAC3669

Engine: 3.6 or 4.0 I6

Engine family: AJ6 / applicable AJ16 configuration

Oil cooler connections

Oil-filter mounting arrangement

Housing shape

Mounting bolt positions

Oil passage configuration

Original housing fitted to the vehicle

Please do not purchase solely because the vehicle is an XJS, XJ6 or XJ40, as Jaguar used different lubrication-system components across different engines and production periods.

Condition

Used genuine Jaguar part.

As a used engine lubrication component, the housing may show normal cosmetic marks, scratches, staining, old oil residue, surface oxidation and other signs of previous installation.

Used housings should be thoroughly cleaned internally before installation to prevent contamination entering the engine lubrication system.

Please inspect the supplied photographs carefully, particularly the oil cooler connections, filter mounting area, threads, sealing surfaces and mounting points.

An ideal genuine replacement for a cracked, leaking, stripped or damaged Jaguar XJS / XJ6 / XJ40 3.6 or 4.0 inline-six engine oil filter housing / oil cooler adapter.