Your timing belt or timing chain connects your crankshaft to your camshaft, or multiple camshafts, and conducts the intricate dance that plays out in your running engine, managing the input and output of air, fuel, and exhaust. A timing failure can catastrophically damage the engine, so read on to learn about how to maintain this important engine part.

Joe Simes is an ASE and Toyota master technician. After 20 years in the industry, Simes recently became a Pennsylvania Department of Education certified automotive technology instructor at North Montco Technical Career Center in Lansdale, Pennsylvania.

A timing belt does not require lubrication, and in fact, any oil or engine fluids that touch the rubber belt can damage the material and lead to failure over time. This is why timing belts are installed in a “dry” setup, away from engine fluids, while timing chains are lubricated in a “wet” setup.

Timing belt or chain

But sealed wheel bearings are non-serviceable and should never be repaired, only replaced. Even if a pro suggests repairing a bearing, don’t let them. Trying to reuse a damaged wheel bearing can result in an accident and severe injury.

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A bad wheel bearing can cause a tire/wheel to move or glide unevenly or sluggishly. It can also cause your brakes to drag, pulling your vehicle to one side when you try to stop.

Your timing belt or timing chain connects your crankshaft to your camshaft, or multiple camshafts, and conducts the intricate dance that plays out in your running engine, managing the input and output of air, fuel, and exhaust. A timing failure can catastrophically damage the engine, so read on to learn about how to maintain this important engine part.

If you are wary of doing this slightly-complicated repair yourself, check AutoZone’s list of Preferred Shops in your area and rely on trusted professionals to make the repair.

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Timing chains last much longer than belts, especially when maintained properly. One of the best things you can do for your timing chain and your engine as a whole is to provide regular oil changes and always replace the oil filter at the same time.

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Various roller shapes such as cylindrical, spherical, tapered and needle rolling elements can reduce friction and support both radial and axial loads.

The average cost to replace a sealed wheel hub bearing is $350 per wheel. However, depending on the make and model, shop labor rate, the cost of the bearing itself and any additional damage, the total could exceed $1,000.

According to Simes, a failing wheel bearing will likely produce a soft, faint vibration that’s felt before it’s heard. There may also be a vague rhythmic humming or droning sound that increases over time and with speed.

Every manufacturer has a prescribed replacement interval for vehicles that use a timing belt, and you should honor that interval. Remember that a timing belt replacement may cost up to $1,000, but an engine timing failure can do much more damage and cost you several thousand dollars to repair.

Friction from a failing wheel bearing produces heat. After driving, without touching the tires or wheels, carefully walk around your vehicle and use a non-touch thermometer to measure if one is hotter than the others.

201181 — Labor should cost about $140-180 for the front and $60-80 for the rear bearing (depending on the shop's labor rate). If you were at my shop ...

Discover why your car's serpentine belt makes noise and how to fix it. Learn about common causes, diagnostics, and solutions at AutoZone.

Your timing chain or belt is connected to the crankshaft pulley at the bottom of the engine and to the camshaft pulley or pulleys at the top of the engine and is designed to turn the camshafts at a precise ratio, compared to the crankshaft, so that the dance goes off without a hitch.

Absolutely not. It’s crucial to get bad wheel bearings diagnosed and replaced ASAP. If not, you could lose a wheel or get in an accident.

Simply stated, wheel bearings allow cars and trucks to run smoother and more efficiently by reducing friction and supporting vehicle weight. When they start to fail, you can usually tell.

Expect to pay for 1-1.5 hours of labor per side, which is usually $80-160.00, plus the bearings to replace. Keep in mind if the race is damaged in the hub, it ...

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Timing belts are made of rubber and reinforced with other materials like Kevlar to add strength and stretch resistance. Some advantages of timing belts are:

Be sure to consult your owner’s manual, a repair guide, an AutoZoner at a store near you, or a licensed, professional mechanic for vehicle-specific repair information. Refer to the service manual for specific diagnostic, repair and tool information for your particular vehicle. Always chock your wheels prior to lifting a vehicle. Always disconnect the negative battery cable before servicing an electrical application on the vehicle to protect its electrical circuits in the event that a wire is accidentally pierced or grounded. Use caution when working with automotive batteries. Sulfuric acid is caustic and can burn clothing and skin or cause blindness. Always wear gloves and safety glasses and other personal protection equipment, and work in a well-ventilated area. Should electrolyte get on your body or clothing, neutralize it immediately with a solution of baking soda and water. Do not wear ties or loose clothing when working on your vehicle.

Toyotatiming belt or chain

The maintenance costs for a vehicle with a timing chain is mostly related to your oil change interval. If you change your oil regularly, according to your manufacturer’s recommendations, it will protect the timing chain and keep it in peak condition for a long time.

One very important step when replacing a timing belt is to carefully mark the position of the crankshaft pulley and the camshaft pulleys before you remove the original belt. You may also need to use a special tool to hold the camshafts in place.

Toyotatiming chainreplacement schedule

Timing belts do need to be replaced at a regular service interval, usually around 60,000 to 100,000 miles, and that cost can be extensive, since it requires the touch of an experienced mechanic. If you install a timing belt improperly it can severely damage the engine. Expect to pay between $100 and $400 for the parts and between $400 and $1,000 for the labor to replace your timing belt. Also, if your water pump runs off the timing belt then it can be wise to replace that at the same time, to avoid the extra cost down the road.

Read on to learn the most common bad wheel bearing symptoms, based on my experience (50 years in the industry) and that of Joe Simes, a National Institute for Automotive Service Excellence (ASE) certified and Toyota master technician. But first, a little background.

On modern front- and four-wheel drive cars, wheel bearings are a set of permanently sealed, precisely machined steel ball or straight roller bearings. The balls, or rollers, are encased in a “cage” that supports the bearings, allowing them to rotate freely.

You can service or replace tapered wheel bearings yourself. Never reuse any wheel bearing that’s loose, worn, noisy or shows any signs of wear.

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Advice, how-to guides, and car care information featured on AutoZone.com and AutoZone Advice & How-To’s are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk. Information is accurate and true to the best of AutoZone’s knowledge, however, there may be omissions, errors or mistakes.

You might think that this is a terrible engineering decision, but interference engines are able to maximize efficiency and improve power delivery as a result of their risky engineering, so they’re here to stay.

Does my car have a timing belt or timing chainnear

Cars are all put together by people just like you, and you can do all kinds of work on your vehicle as long as you take your time and follow repair guidelines precisely.

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NOTE: Whether you DIY or your mechanic replaces the bearing, always install a new axle hub nut. Most hub nuts are prevailing torque fasteners, used on critical components (like securing axle shafts to hub bearings) where a loose nut could lead to disastrous consequences.

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On many vehicles, the ABS sensor is built into the wheel bearing, or it’s externally mounted adjacent to the spinning part of the bearing where the sensor measures vehicle speed. Damaged from a wobbly wheel bearing, the sensor will send erratic readings to the vehicle’s computer, illuminating the ABS light.

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Unlike unbalanced tires, shaking caused by a bad wheel bearing should be obvious from the side of the car where the bearing is failing.

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A modern four-stroke engine works on the cycle of ‘suck, squeeze, bang, blow’. It describes pulling in air to the cylinder, mixing it with fuel, compressing the mixture, introducing a spark that initiates combustion, and then releasing the exhaust out of the cylinder. All these actions have to happen in precise coordination for the engine to produce power and not blow itself up.

The cage and rollers are held together inside a hardened metal ring called a “race.” The seal keeps grease in and damaging water and debris out. Wheel bearings are installed inside, and secured to, the suspension, either by press fit, bolts or a snap-ring. Once mounted, the wheel bearing rides on the axle shaft, allowing the tire/wheel to spin effortlessly.

Reliability Matters Fluid Sealing & Equipment Protection Expertise worn-bearings By chesadmin Bearing failure is common.

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In many modern engines, the valves that open for air and fuel intake and exhaust output actually share space with the moving piston, although never at the same time. This style of engine is called an interference engine and, as you can imagine, creates a requirement for those valves and pistons to be perfectly coordinated. If they step out of alignment for even a moment, the piston can strike and damage the valve, rendering the engine inoperable.

Every vehicle has either a timing belt or timing chain specified as the OEM part, and you should always replace your chain or belt with the equivalent part. All the pulleys and gear sets that make up the timing system in your car will be set up for either a chain or a belt and it’s not advisable, or even possible, to swap them out.

You’ll hear clicking, cracking, grinding, snapping, or whining noises coming from your wheels or tires. They’ll increase when accelerating or turning.

If you decide to attempt the repair yourself, consult your owner’s manual for any specifications, do research online to prepare for the repair and get all your timing belts and chains at AutoZone. Many timing belts can be purchased with accessory parts, like gaskets, pulleys, tensioners, and even water pumps, in a kit that makes the overall cost less impactful.

Early vehicles used chains or gears to manage the timing and belts only became common in consumer vehicles during the 1960s. In the 1990s, automakers moved back to timing chains and modern cars tend to have a timing chain.

Learn about car belts, discover wear signs, and decide between DIY or professional replacement. Find top-quality replacements at AutoZone.

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Depending on the vehicle, you can save hundreds in labor replacing wheel bearings yourself. Most auto parts stores will lend you the specialty tools and equipment needed to replace a wheel bearing.