If you’re used to working with the suspensions of cars and lorries that weigh up to 3.5 tonnes, you’ll certainly have heard of silent blocks.
In this article, we’ll be explaining their importance, telling you when they should be replaced, and giving you some tips on how to maintain them.
Keep reading!
What are Silent Blocks?
Silent blocks are components within a car’s suspension that make it operate more quietly.
Silent blocks are made of polyurethane or rubber and are encased by an iron or aluminium metal rim.
Whether made of rubber or polyurethane, silent blocks absorb the vibrations and noise made by a car’s suspension.
If you hear any noise coming from your vehicle’s suspension, it may indicate that your silent blocks are damaged.
What are the different categories of silent blocks?
- Design – silent blocks can have one or two bushings, which may contain metal elements or not;
- Load – they can have a continuous elastic insert or one with holes
- Type of fixing
- Mobility – can have a medium or fluctuating mobility adapted to each situation
- Material – they can be made of rubber or polyurethane
What are the silent blocks used for?
The main purpose of silent blocks is to absorb vibrations and impacts while a car is in motion.
Silent blocks can be found within the suspension mechanism of any car, alongside components such as springs, a stabiliser bar, and shock absorbers.
Silent blocks are responsible for bridging the gap between a car’s chassis and suspension in order to allow a car’s body to move soundlessly as it drives over the imperfections in the road surface.
Where are the silent blocks located?
The location of silent blocks varies from vehicle to vehicle. They may be:
- In the rear or front levers
- In the longitudinal and transversal suspension bars.
- On the stabiliser bushes
- On the shock absorbers.
- On the power unit and transmission mountings.
When should the silent blocks be replaced?
Silent blocks should be replaced every 100 thousand km. However, if they show signs of deterioration before that milestone, you should replace them as soon as possible.
What should you do with damaged silent blocks?
Damaged cylinder bells should be removed and replaced with new ones.
Can damaged silent blocks cause suspension noises?
Yes, damaged silent blocks can cause suspension noises. Noises can be caused by poor suspension springs, poor shock absorbers or poorly silent blocks functioning
If you hear any noises coming from these components, you should consult your trusted mechanic.
How much do silent blocks cost?
The price of silent blocks can range between 10 and 45 euros per unit.
How can you replace your silent blocks with a silent block remover?
To change the silent blocks we have an installation and bearing removal kit available in our catalogue that can be used as a puller.
To find out how to change the silent blocks, please take a look in our blog article and watch our tutorial on YouTube.
Silent block maintenance tips
As silent blocks are made up of metal components alongside rubber or polyurethane components, to keep your vehicle’s silent blocks in good condition, you must keep them clean and drive carefully to prevent the metal parts from corroding and rubber components from tearing.
You should also check this component during preventive maintenance with your mechanic.
In short, it is advised to clean this component with water and specific cleaning products.
What are the signs of a poorly maintained silent bocks?
- Your vehicle is unstable;
- Your vehicle is less comfortable to drive;
- Suspension arm mounts are damaged;
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