Bonnet strut: common defects and their signs

1. Thermal damages.
   • Operation of the bonnet strut may worsen during cold time, the component may be jammed.
   • The strut doesn’t hold the bonnet in the upper position.
   • The bonnet doesn’t close.
2. Corrosion.
   • It is impossible to open the bonnet fully.
   • Bonnet vibration is noticeable during driving.

How to replace bonnet strut?

Manufacturers do not indicate a specific service life limit for the bonnet gas strut. Temperature conditions affect the duration of the component lifetime: it wears out faster in winter. The strut is non-repairable. In case of unserviceability it should be replaced. Selecting new bonnet gas struts, consider their extended and compressed length which should be equal to the same parameters of the part which is broken down. If car design envisages two struts, it is recommended to replace them in pair, even if one of them is in good working order.

Replacement procedure depends on the car model and the type of strut fasteners. There are components with pivot connections on the ends, or with a complex fastening combining the fast-pin hinge rigid mounting and pivot joints.

With availability of standard tools set and basic knowledge, replacement of the bonnet strut can be performed by any car owner. Before starting works, study vehicle technical documentation, as the replacement procedure may vary for cars of different models. Basic procedure of gas strut replacement is:

1. Open the bonnet and secure it with a reliable support which will hold the bonnet in the upper position.
2. Remove the pivot joint that fastens the strut to the bonnet. If the component is mounted using a rigid fastener, unscrew it and remove the defective strut.
3. Install and fasten a new component.