Axles and CV Joints
A CV joint or constant velocity joint is a type of mechanism that connects two fixed rotating shafts. It allows the shafts to be connected while axis pivots change like what happens when suspension or steering operation occurs. CV joints are widely used in front wheel and rear wheel drive cars. They can deliver torque more evenly then U joints. A major difference between the CV and U joints is the way they are serviced. A CV joint is constructed with a rubber boot that is meant to contain the lubricating grease. A typical “U” joint has grease seals on each bearing cap so a boot is not needed. The CV joint is virtually non-serviceable unless the boot ruptures or extreme conditions exist, like high mileage or abuse. When the CV joint fails simply replace it with a new unit.
Questions & Answers
1. Where are the CV joints on my car?
2. What are the consequences of CV joint failure?
3. What are the signs that my CV joints are going bad?
4. How long do CV joints last on average?
5. How can I avoid having my CV joints go bad?
6. Do I need to change the whole axle when changing my CV joints?
7. I think my alternator is bad. Do I need to make an appointment?
1. Where are the CV joints on my car?
One end of the axle is connected with the transmission. This end has a CV joint. The other end is splined, and slips into the wheel hub. Unlike the transmission end, the wheel end of the axle is much easier to remove. Like the transmission end, the wheel end also has a CV joint.
2. What are the consequences of CV joint failure?
Wheels will not fall if CV joints fail. Wheels can fall off if the wheel bearing fails however.When a CV joint fails, power is no longer transmitted through the joint. As a result, whichever wheel that axle usually powers will no longer receive power. The axle (which the CV joint is a part of) does not hold the wheel onto your car. Anyone who has wrenched on a car themselves and has done any transmission work, knows that you can pull the axles completely out of the car and still roll the car around.
3. What are the signs that my CV joints are going bad?
Generally when your car’s CV joints are failing you will hear a clunking noise coming from the front CV’s usually when turning corners. This sound may start happening regularly when they are really bad.
4. How long do CV joints last on average?
CV joints are designed to last upwards of 150,000 miles, but design flaws and driving conditions can shorten their life span.
5. How can I avoid having my CV joints go bad?
You can visually check the condition of the CV boots often. Check them every time you perform an oil change and when you add air to your tires. Just throw down a clean drop cloth and look under your car. If you see signs of grease, feel around the boots to cracks or holes. If you catch the problem early enough you may be able to save some money by replacing just the boot and grease.
6. Do I need to change the whole axle when changing my CV joints?
It may be both wiser and more cost affective to just to replace the whole axle although you don’t have to. This is due to the fact that it’s easier and therefore cheaper to replace the whole axle as an assembly rather than disassemble it to replace a joint and boot. Some are not even sold separately.
7. Do I need to make an appointment or do you take walk-ins?
Yes, you need to make an appointment by calling us at 425.774.4646 or clicking here.