Watts Link Bushes

Watts link bushes are suspension mounting components used within a Watts link or Watts linkage, a mechanism used in some rear suspension systems to control lateral axle movement. Bushes at the linkage pivots allow the components to articulate as the suspension travels while helping keep the linkage securely located.

Because a Watts link contains multiple pivot points, wear can develop at different positions within the assembly. Identifying whether movement is coming from the centre pivot, side rods or another suspension component is important before selecting a Watts link bush kit.

What Is a Watts Link?

A Watts link, also known as a Watts linkage, is a mechanical linkage used in some suspension systems to locate an axle laterally while allowing vertical suspension movement.

A typical Watts link arrangement uses two side links connected through a central pivoting linkage. As the suspension moves, the linkage articulates through these pivot points while controlling side-to-side axle movement relative to the vehicle.

This makes the Watts link an important locating mechanism within applicable rear suspension designs. The bushes and pivots within the linkage need to accommodate its intended articulation while controlling unwanted movement at their mounting points.

Watts link suspension designs can vary, so the exact configuration and bush locations should be confirmed for the particular application rather than assuming every Watts linkage suspension uses identical components.

Types of Watts Link Bush Kits

Watts link bush kits can service different parts of the linkage. Some may address multiple mounting positions, while others are intended for an individual pivot or link.

The correct replacement therefore depends on which part of the Watts linkage requires servicing.

Complete Watts Link Bush Kits

A Watts link bush kit may contain bushes intended to service multiple mounting positions within the linkage.

The contents of a kit can vary according to the suspension design and application. A complete kit should therefore be identified by its specified fitting positions rather than assuming every Watts link bush kit contains the same number or type of components.

Where several bushes within the linkage have been in service under similar conditions, inspecting the complete assembly can help determine whether one or multiple mounting points require attention.

Centre Pivot Bushes

The centre pivot is a key articulation point within a Watts linkage. As the suspension moves, the central linkage rotates to accommodate movement of the axle while the side links control its lateral position.

A serviceable centre pivot allows this movement to occur without excessive unwanted play. Wear at the pivot or its bush can introduce movement into the linkage, although the complete assembly should be inspected before attributing a suspension concern to this component alone.

Centre pivot construction varies between Watts link designs, so the appropriate replacement needs to match the specific assembly.

Side Rod Bushes

The side rods or links within a Watts linkage connect the central mechanism to mounting points on the axle or vehicle structure, depending on the suspension arrangement.

Bushes at these connections allow the links to articulate as the suspension moves. At the same time, they help maintain controlled location of the linkage as lateral forces act through the suspension.

Bush dimensions and designs can differ between mounting positions, so a side rod bush should be selected according to its specific location within the Watts link assembly.

Signs Your Watts Link Bushes May Need Inspection

Watts link bushes experience repeated articulation and changing loads as the rear suspension moves. Over time, wear or deterioration can result in excessive movement at a linkage mounting point.

Reasons to have a Watts link and surrounding rear suspension inspected can include:

• Knocking or clunking from the rear suspension
• Excessive movement at a Watts linkage pivot
• Visible deterioration or damage around a bush
• Changes in rear suspension behaviour or stability
• Unwanted lateral movement that requires investigation
• Uneven or unexplained tyre wear
• Movement identified during a suspension inspection

These symptoms do not prove that a Watts link bush has failed. Rear suspension noises or changes in behaviour can originate from several bushes, joints, dampers, mounts or other suspension components.

The centre pivot and side-link mounting points should therefore be inspected together when diagnosing excessive movement within a Watts linkage.

Bush Material and Controlled Watts Link Movement

Bush design can influence how much movement occurs at Watts link mounting points under load. The objective is to allow the articulation required by the linkage while controlling movement that is not intended by the suspension design.

Where polyurethane Watts link bushes are appropriate for the application, their resistance to deformation can help reduce unwanted bush deflection and provide more controlled location at the mounting point. Polyurethane is also valued in suspension applications for its durability and resistance to deterioration.

The appropriate bush still depends on its position, dimensions and overall design. A centre pivot and side rod connection may have different requirements, so material should be considered alongside correct fitment rather than as a substitute for it.

Watts Link vs Panhard Rod: How the Bushes Differ

A Watts link and a Panhard rod can both be used to control lateral axle movement, but they achieve this through different suspension arrangements.

A Panhard rod typically uses a single lateral link connected between the axle and vehicle structure. A Watts linkage uses multiple links and a central pivoting mechanism to control lateral movement.

Their bushes therefore belong to different mounting arrangements. A Watts link bush should not be confused with a Panhard rod bush simply because both components are associated with lateral axle location.

The broader differences between these suspension designs extend beyond their bushes, but for replacement purposes the key point is that each requires components designed for its particular linkage and mounting positions.

What to Check Before Buying Watts Link Bushes

Finding the correct Watts link bushes starts with identifying where excessive movement or deterioration is occurring within the linkage.

Before choosing a Watts link bush or bush kit, check:

• Whether the affected position is the centre pivot or a side-link mounting point
• Whether one or multiple bushes require servicing
• The specific mounting position of each replacement bush
• Whether there is wear or damage elsewhere in the linkage
• Accurate fitment information for the application

If the source of a rear suspension noise or unwanted movement has not been confirmed, an inspection can help determine whether the Watts linkage is actually responsible before replacement parts are ordered.

The complete linkage should be considered during diagnosis because movement detected in one area may be transferred through interconnected components and become noticeable elsewhere.

Get Watts Link Bushes from Fulcrum

Correct diagnosis is particularly useful with a Watts linkage because several pivot points operate together within the same suspension mechanism.

Fulcrum Suspensions can inspect rear suspension bushes, linkage mounting points and surrounding components to help identify where excessive movement or deterioration is occurring. This can help distinguish a worn Watts link bush from other rear suspension issues before parts are replaced.

Where replacement is required, Fulcrum can assist with identifying the appropriate bush for the relevant mounting position and provide professional installation where required.