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Precision engineering

Enabling free movement in two planes at the same time, the ball-pin is a critical component. That’s why our ball-pins are manufactured from high-grade steel and machined to micron tolerances. Together with a polyoxymethylene nylon ball-pin seat, they provide optimum durability and smooth joint operation.

Extensive testing

Delphi ball joints undergo rigorous performance tests including angular stress testing, where the ball is rotated through its angular and rotational travel under load, as well as a pull and push out test, to measure the force required for it to break away from the housing. These important safety tests ensure the ball joint can withstand the same forces as the OE part.

Longer service intervals

We provide a range of sealed ball joints, that are lubed for life with a high-specification grease, to minimise maintenance requirements. Alongside our precision ball-pin finish and improved rubber boot design, they offer longer ball joint service intervals and better grease retention.

Greater protection

To help prevent damage to the joint’s internal components, all our ball joints come with a special chloroprene rubber cover. The new and improved formula maintains its durability even in extreme temperatures, providing added protection from road dirt or salt and allowing continued free movement of the ball joint for a longer lasting part.

Three-year warranty – available in UK

As a guarantee of our OE-quality standards, we offer a three-year or 36,000-mile warranty on all our ball joints. So, you can fit Delphi steering parts with complete confidence.

Cataphoretic coating

Like many of our steering parts, Delphi ball joints feature an environmentally friendly cataphoretic coating for tougher and longer lasting protection from corrosion caused by salt, dirt and water and other contaminants.

Tech Tip

Delphi is advising technicians to help ensure a quality steering and suspension repair by replacing the entire ball joint component where the rubber boot is split, cracked, damaged or missing. In these instances, there is a high probability that damage to the ball joint may have occurred, indicating the joint is likely to fail even after the boot cover has been replaced. Replacing the entire ball joint component can help avoid potential premature failure, which can be safety-critical and costly.

By replacing the boot only and not the complete ball joint unit, the rubber boot could potentially seal in the damaging substances the joint has been exposed to, resulting in accelerated rust and corrosive damage to the joint. In addition, the ball joint is designed to operate with a grease lubricant.

A defective boot could lead to a loss of this essential lubrication, as it may be washed away with water, dry out or become coated with dirt and other debris.

The Delphi Difference

100 years of OE experience, supplier to the world’s top automakers
OE heritage and knowledge built into every aftermarket part
Comprehensive portfolio for a wide range of vehicles and model years
Streamlined SKUs for easy inventory management
Support through tools, tips and training

Related product resources and downloads

Steering & Suspension 3 min read

Best practice advice on strut mount replacement

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Steering & Suspension How to Technicians 3 min read

Resource Highlights

In this article you will find out about the best practice advice on strut mount replacement

What is a strut mount?
Why it fails?
Symptoms of a faulty strut mount
When to replace?
Why replace in pairs?

You know that wishbones, ball joints and link stabilizers are all key when it comes to servicing steering and suspension, but what about the top strut mount? Perhaps the unsung hero of any system, it helps to cushion noise and vibration, while also acting as a steering pivot for a smooth and responsive ride.

Since any wear or tear to this part can negatively affect vehicle handling and, in turn, safety, it’s important to know how it should be serviced.

What is a strut mount?

Fitted on cars equipped with Macpherson type struts, the top strut mount attaches the top of the strut to the vehicle’s chassis. Its purpose, however, extends far beyond a simple mount. Indeed the top strut mount has two main roles; it insulates the strut from the vehicle, reducing both noise and vibration. Many front strut mounts also contain a bearing which acts as a steering pivot – so as you turn the steering wheel from left to right and vice versa, the strut pivots on the strut mount, controlling the angle and alignment of the wheels.

Why it fails?

Although top strut mounts are designed to last, they are subject to significant stress day in, day out. Together with the bearing and coil spring they hold the full weight of the vehicle. They are also constantly moving – a typical strut will endure millions of cycles during its lifetime – up to 1750 times for every mile driven on a normal road surface. This constant up and down movement, which is exacerbated by potholes, bumps and curb strikes, pushes and pulls at the mount causing wear overtime. In addition, environmental factors such as ice, water, salt spray, humidity and temperature changes can all cause damage.

Symptoms of a faulty strut mount

Like most other parts, there are a few tell-tale signs of a faulty strut mount. If your customer complains of any of the following, the top strut mount could be at fault:

Abnormal noises coming from the steering and suspension system. For example, clunking when driving over bumps or squeaking when maneuvering at low speed

Premature and/or uneven tire wear
Accelerated wear of shock absorbers
Excessive vibration
Poor wheel/tire alignment
Poor steering return

As well as these common symptoms, a good visual inspection will help to identify possible wear or damage. Look for any signs of corrosion, cracks or tears in the rubber, separation from the metal and excessive movement in the strut assembly. Also check the steering pivot to ensure smooth and free rotation.

When to replace?

Although not part of the routine service schedule, you should regularly check the top strut mounts and, where necessary, replace in pairs – left and right sides – as soon as possible. As well as affecting steering response and driver comfort, worn or damaged top strut mounts can have a knock-on effect on other parts of the steering and suspension system such as shock absorbers and tires, accelerating wear and causing unnecessary expense for the vehicle owner.

Also, because the top strut mount is essentially a low-cost part, in what is often a very labor intensive process, it makes sense to fit new ones whenever you’re replacing the struts. Either way, in most cases, you’ll have to remove the strut and decompress the coil spring, so it could save you from having to do the same job twice.

Why replace in pairs?

Because top strut mounts will typically endure the same number of miles and road conditions, chances are if one side is worn, the other will be too. It's therefore advisable to replace in pairs – left and right side. Doing this will ensure their performance is evenly matched across the axle for a balanced ride height and equally responsive steering and handling. An imbalance on either side could impact both chassis and wheel movement, ultimately compromising the vehicle’s handling.

Top strut mount replacement can be a lengthy process, but by following the best practice advice shown in the video below Delphi can help to make it as seamless and ‘pain-free’ as possible: