Jaguar XJS Facelift CAC6853 Power Steering Fluid Bottle Expansion Tank 1992 4.0

#85

Genuine used Jaguar XJS Facelift 4.0 power steering fluid reservoir / bottle, part number CAC6853, removed from a 1992 Jaguar XJS 4.0.

This reservoir forms part of the hydraulic power-steering system and provides the fluid storage and supply point for the power-steering pump. It should not be confused with the engine coolant expansion/header tank.

Part Number: CAC6853

Jaguar OE Number: CAC6853

Part Type: Power Steering Fluid Reservoir / Power Steering Bottle / Hydraulic Fluid Tank

System: Hydraulic Power Steering

Application: Jaguar XJS 6-Cylinder

Donor Vehicle: 1992 Jaguar XJS Facelift

Donor Engine: 4.0-Litre Inline 6-Cylinder

Position: Engine Bay

Manufacturer: Jaguar

Condition: Genuine used OEM part

Compatibility

Suitable for selected Jaguar applications using CAC6853, including:

* Jaguar XJS / XJ-S 3.6

* Jaguar XJS Facelift 4.0

* Selected Jaguar XJ40 applications using the same reservoir

Jaguar XJS parts data identifies CAC6853 as the power-steering reservoir for the 3.6 / 4.0 six-cylinder power-steering system.

This listing’s component was removed from a:

1992 Jaguar XJS Facelift 4.0

Because catalogue year ranges for CAC6853 vary between suppliers, buyers with early facelift/1992 vehicles should compare the original reservoir carefully before ordering.

Important – Power Steering Reservoir

This is a:

POWER STEERING FLUID RESERVOIR

It is not the engine coolant expansion/header tank.

On the 4.0 XJS, the reservoir stores hydraulic fluid for the power-assisted steering system.

Useful search descriptions for this component include:

* Power Steering Reservoir

* Power Steering Fluid Bottle

* PAS Fluid Reservoir

* PAS Tank

* Steering Hydraulic Fluid Reservoir

* Power Steering Expansion Tank

“Expansion tank” is sometimes used informally in used-parts listings, but power steering reservoir is the technically correct description.

Technical Information

The hydraulic power-steering system uses pressurised fluid to provide assistance at the steering rack.

The system includes components such as:

* Power steering fluid reservoir

* Power steering pump

* Reservoir-to-pump hose

* High-pressure steering hose

* Low-pressure return hose

* Steering rack

* Associated seals and connections

The reservoir itself is on the low-pressure side of the hydraulic circuit.

Fluid is supplied from the reservoir to the power-steering pump. The pump then pressurises the hydraulic fluid and sends it to the steering rack.

After assisting the steering mechanism, the fluid returns through the low-pressure circuit to the reservoir.

Related Jaguar References

For the six-cylinder XJS steering system, associated Jaguar references include:

CAC6853

* Power steering reservoir

JLM2162

* Power steering reservoir filler cap

MHD3980AA

* Reservoir-to-pump low-pressure hose

Other steering hoses differ depending on vehicle specification and RHD/LHD configuration.

Common Reasons for Replacement

Typical reasons for replacing the reservoir include:

* Reservoir cracked

* Plastic becoming brittle with age

* Broken hose connection

* Damaged hose outlet/nipple

* Fluid leaking around reservoir

* Damaged filler neck

* Reservoir mounting point damaged

* Contamination inside reservoir

* Reservoir damaged during engine-bay work

* Previous incorrect repair

* General age-related deterioration

Because these reservoirs are now several decades old, the plastic should be handled carefully during removal and installation.

Important Hose Connection Information

Pay particular attention to the hose outlets on the reservoir.

Age, engine-bay heat and repeated hose removal can make the plastic connections brittle.

Inspect for:

* Hairline cracks

* Split outlet necks

* Previous adhesive repairs

* Distortion

* Damage around hose clips

* Fluid staining around connections

Do not overtighten hose clamps against an aged plastic outlet.

Common Power Steering Symptoms

A reservoir or associated hydraulic-system problem may result in:

* Visible power-steering fluid leak

* Falling fluid level

* Fluid around reservoir

* Fluid around hose connections

* Power steering pump whining

* Foaming/aerated fluid

* Heavy steering

* Intermittent steering assistance

* Fluid contamination

However, these symptoms do not automatically mean the reservoir itself is faulty.

Important Diagnostic Information

If the vehicle is losing power-steering fluid, inspect the complete hydraulic system before replacing the reservoir.

Check:

* CAC6853 reservoir

* Reservoir cap/seal

* Reservoir hose outlets

* Reservoir-to-pump hose

* Low-pressure return hose

* High-pressure hose

* Hose clamps

* Power steering pump

* Steering rack

* Hydraulic connections

Fluid around the reservoir can sometimes originate from a leaking hose or connection rather than a crack in the reservoir itself.

Pump Noise / Foaming Fluid

If the power-steering pump is whining or the fluid is foaming, check for:

* Low fluid level

* Air entering the hydraulic system

* Loose hose connection

* Cracked suction hose

* Restricted fluid supply

* Incorrect fluid

* Pump wear

* Contaminated fluid

Air entering the suction side of the system can cause pump noise even when an obvious external leak is not present.

Reservoir Inspection

Before installation, inspect the used reservoir carefully for:

* Cracks

* Splits

* Damaged mounting points

* Damaged filler neck

* Damaged hose connections

* Previous repairs

* Excessive contamination

* Distortion

The hose outlets are particularly important because damage in these areas can cause hydraulic-fluid leakage.

Installation

Before fitting:

* Compare CAC6853 with the original reservoir

* Compare overall shape

* Compare mounting points

* Compare filler neck

* Compare hose outlet positions

* Compare hose outlet diameters

* Inspect connecting hoses

* Inspect hose clamps

When installing:

* Secure the reservoir correctly

* Connect hoses to the correct outlets

* Avoid excessive force on plastic connections

* Use suitable hose clamps

* Refill with the correct specified power-steering fluid

* Check the hydraulic system for leaks

Power Steering System Bleeding

If the reservoir or hydraulic hoses have been disconnected, air may enter the power-steering system.

After installation, the system should be filled and bled using the correct Jaguar workshop procedure.

During initial testing:

* Monitor fluid level

* Check for foaming

* Listen for abnormal pump noise

* Inspect all connections for leaks

* Check steering assistance

* Recheck fluid level after air has been removed

Do not allow the power-steering pump to run without adequate fluid.

Programming / Coding

No programming or coding is required.

This is a mechanical/hydraulic power-steering component.

Important Compatibility Note

Please compare before ordering:

* Jaguar OE number – CAC6853

* Reservoir shape

* Filler-neck design

* Hose outlet positions

* Hose outlet diameters

* Mounting points

* Original reservoir

* Engine configuration

* Vehicle production/VIN where necessary

The XJS parts catalogue identifies CAC6853 for 3.6/4.0 applications, but some specialist catalogues give narrower production-year ranges for the 4.0 XJS.

For this reason, particularly on a 1992 XJS 4.0, matching the CAC6853 number and physical reservoir configuration with the original component is strongly recommended.

Condition

Genuine used Jaguar power-steering fluid reservoir.

Removed from a 1992 Jaguar XJS Facelift 4.0.

As a used engine-bay component, normal signs of previous use and age may include:

* Surface marks

* Scratches

* Dirt

* Oil/fluid residue

* Discolouration

* General installation/removal marks

Please inspect all listing photographs carefully, particularly the:

* Hose outlets

* Filler neck

* Reservoir body

* Mounting points

* Seams

* Plastic connections

Filler cap is included only if clearly shown in the listing photographs.

Only the reservoir and associated components clearly shown in the photographs are included.

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

Ideal genuine replacement for a cracked, leaking, brittle or damaged Jaguar XJS 3.6 / 4.0 power-steering fluid reservoir, provided CAC6853 matches the original component.