A CV axle is made up of 2 CV joints. The axle transmits torque from the engine and
transmission to drive the vehicle's wheels.
Constant velocity joints,
or CV joints are universal joints that are able to transfer torque at large
angles efficiently. These CV joints transfer power very smoothly. They are comprised
of four basic parts: 1. The outer section, which has grooves machined on
its inner surface, 2. the bearings, which are usually in a "cage", 3. the inner
ball, which has grooves on its outer surface for the bearings to ride in, and
4. a rubber boot to protect the unit from dirt and moisture.
A common
cause of CV joint failure is cracks in the CV boot. When the boot is cracked,
it allows dirt and grit to mix with the grease and wear down the parts of the
joint. A clicking noise heard when turning is the most common symptom of CV joint
problems. The CV boots should be replaced as soon as cracking is visible in
their rubber folds.
Important Note: Never open a boot to inspect the
CV joint. The boots are airtight and if opened, the CV joint will require servicing. |
