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CONSTANT VELOCITY JOINTS (CV JOINT)

CONSTANT VELOCITY JOINTS (CV JOINT). PURPOSE. Transfers power to the front drive wheel smoothly when the wheels are turned left or rght. Allows for suspension movement as well. CONSTRUCTION. Outer case has long splines for fitting in wheel hub.

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CONSTANT VELOCITY JOINTS (CV JOINT)

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  1. CONSTANT VELOCITY JOINTS (CV JOINT)

  2. PURPOSE • Transfers power to the front drive wheel smoothly when the wheels are turned left or rght. • Allows for suspension movement as well.

  3. CONSTRUCTION • Outer case has long splines for fitting in wheel hub. • Inside of case is precision machined with grooves. • Highly precise cage holds a series of ball bearings which fit in the grooves in the case. • Flexible rubber boot covers joint and is filled with grease. The boot is tightly clamped on to prevent loss of grease and entry of debris.

  4. LOCATION • One CV joint assembly is attached to each end of the drive axle. • Most FWD vehicles have 2 drive axles going to the front wheels. • Some 4WD vehicles have 4 drive axles.

  5. PROBLEMS • The rubber CV boot covering the joint can tear, allowing the grease to ‘fling’ out. This allows the joint to run dry, causing excessive wear. • CV boots should be replaced as soon as they show signs of cracks. • Excessively worn, dry CV joints may seize, causing poor handling, they also cause poor fuel economy when seized.

  6. DIAGNOSIS • Close visual inspection of the CV boots will reveal any cracks or leaks. This should be repaired ASAP. • A rattling/clunking sound when the wheels are turned and power applied indicate worn CV joints.

  7. APPROXIMATE COST OF REPAIR • CV joints are best replaced as a complete axle assembly. • Separate CV joints are available, but sometimes are not worth the labour. • FWD drive axles cost from $150 to over $500, depending on vehicle and design. • Labour to replace an axle is around 1 hour each. • Replacing just a CV boot can take about 1 ½ hours.

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