Rail: The term rail is often a casual way of referencing track-roller linear guides, or it can imply profiled rail with its pairing of carriage blocks. In other contexts, rail might specifically imply the track geometry and its surfaces that serve as the wheel raceways.

In addition to these tools, you will also need some materials specific to timing belt replacement, such as a new timing belt, timing light, timing belt cover gasket set, belt tension gauge, and bolts or pins to hold the camshaft position during your work. Depending on your vehicle's make and model, you may also need a harmonic balancer puller or three-jaw gear puller to remove the crankshaft pulley if it doesn't just slide off.

Once you have the tension right, you need to confirm all your timing marks are lined up. Lining up your timing marks is similar to setting your watch. If you don't set your watch right, you may be late or early. If you don't set your timing belt correctly, being late or early means your engine won't run efficiently and you run the risk of damaging your engine. Your automobile will have specific timing marks to set. Pay attention to your technical manual when confirming your marks are lined up. Then, proceed with reassembly.

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So why is this important? The crankshaft converts linear energy from the pistons, which move up and down, into rotational energy that eventually turns the wheels. The camshaft opens and closes the engine's valves to allow air and gas in and out of the engine. The timing belt links the two in harmony. Without it, the pistons and valves would collide.

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Common cam-follower designs employ thin cylindrical-shaped needle rollers for higher radial loads and speeds. Cam followers with twin rows of standard ball-bearing elements are good for high loads where the axis needs high dynamic load capacity. Both are ubiquitous in automated storage and retrieval systems.

Furthermore, keep in mind that your timing belt will attain natural wear and tear from the engine environment -- a toasty world that can get up to more than 500 degrees Fahrenheit (260 degrees Celsius). If there are any additional outside factors to the belt's wear, you may need to pick up the pace on vehicle maintenance of your belt. Examples of other factors affecting your auto maintenance schedule include:

Cam followers are power transmission devices with a rotary bearing core that bears the load (both radial and axial) while serving as the interface between independently moving machine sections. Physical separation between these sections is maintained to minimize rotational friction.

Now that you have your tools lined up and service manual handy, let's take a look at how to remove your old timing belt.

However, timing chains can stretch with age and are noisier, heavier and more expensive to repair -- if automotive maintenance ends up being necessary [source: Carley].

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Once you reach this point, you're halfway there. Next up is installing that new timing belt. Continue to the next section to learn what steps to take, as well as the significance of setting tension and lining up your timing marks.

Track-roller linear guides often serve in two challenging application types including long-stroke linear-motion axes and linear systems in harsh environments. Below is a quick list of five track-roller benefits:

Now, right when you're ready to jump into your car maintenance project, you might become wary of your ability to accomplish this task. However, if you have a moderate knowledge of engines, you will most likely be able to tackle a timing belt replacement [source: Trottier].

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In fact, if Dan Trottier, an automotive technician with Bob's Auto Service Inc. in Saco, Maine, has any advice for timing belt replacement it's to take your time. He says, "Just take your time and you can do it. Don't feel you have to move quickly. Move at your own pace."

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The tracks and carriages of linear guides provide innumerable options for tailoring the appropriate performance to the application.

One of the core considerations when sizing and selecting a linear actuator is mounting orientation. Below are five factors that engineers should consider when designing for vertical duty:

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Once you have everything under your hood back together, your new belt is set for its role as drum major of your car. You can take to the field for your halftime show -- or the open highway -- knowing you've enhanced your chances that all the players in your engine will remain on tempo.

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Considering these factors and routine car maintenance, chances are you'll need to replace your belt during your ownership of your vehicle. And when that time comes, there are certain tools needed for a timing belt replacement. If you're accustomed to doing your own repair work, you'll likely have most of the tools you need. These include:

Timing chains work just like timing belts in keeping time between the crankshaft and camshaft. Belts and chains dual it out for popularity, though -- changing places leading the pack for auto manufacturers. Currently, timing chains seem to be winning, most likely because they usually don't require maintenance and last the life of an engine [source: Trottier].

If you're replacing your belt as part of routine vehicle maintenance, then chances are your old belt -- the one you've successfully removed -- kept your engine in time for several years. To do that belt justice and keep your vehicle going strong, people embarking on their own auto maintenance need to take care when attaching new timing belts.

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Alignment refers to the geometry of the entire suspension system. The system is comprised of control arms, steering components, and mounting points.

Load-capacities, which can be computed into static and dynamic values, are central to the specification of linear guides. Real-world influences on wear and life can include:

And, as with most auto maintenance procedures, one size doesn't fit all. Procedures, tools and belt type needed for timing belt replacement vary depending on vehicle make and model. Therefore, perhaps the most valuable tool of all during a belt replacement is a technical manual from a reputable automotive maintenance publisher, such as Chilton or Bentley Publishers [source: Trottier].

Sliding element linear guides consist of a carriage or slide that rides over a surface known as a rail, way, or guide. Sliding contact occurs when the moving part directly contacts the rail section.

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From these steps, the most important ones and those that deserve further discussion are the adjusting of tension and lining up of the timing marks. Just like a bandage that can cut off circulation if it's too tight or not provide enough protection if it's too loose, there's a middle road to take with tension. A belt that is on too tight will not last as long; a belt that is on too loose may skip or jump and fail to keep proper time. This makes your car less efficient and creates the possibility that your pistons and valves will collide. Always refer to your technical manual for exact tension specifications.

Obviously, this is bad news for vehicle maintenance as this internal collision can cause destruction fair amount of engine damage. Therefore, it's important to stay ahead of your belt's lifespan -- traditionally replacing it every four years or 60,000 miles (96,561 kilometers) or, in newer vehicles, every 100,000 miles (160,934 kilometers). Be sure to check your vehicle's maintenance manual to see what your car or truck's manufacturer suggests.

Gothic-Arch Linear Bearing (4 points of contact): Gothic arches have greater clearance and roller-to-rail contact that provides exceptional linear accuracy, but can make for lower load capacities.

Track-roller wheels can be customized to an application through their internal bearing-element arrangements, sealing, and outer tread geometry and material makeup. Variations in wheel geometries and their benefits include:

In general, a car enthusiast who is not a trained professional should allocate about eight hours to complete this vehicle maintenance procedure [source: Trottier]. The first thing you'll need to do is to remove the old timing belt. Although the procedure will vary based upon the technical manual you're using, in general you should:

Roller Bearings: The term roller bearing generally refers to rotary bearings with cylindrical roller load-bearing elements instead of spherical ball load-bearing elements.

This first section breaks down the main types of linear guides and their subtypes along with a comprehensive look at the standard industry terminology used to describe them.

Although your technical manual will provide instructions for your car maintenance needs, the basic steps of attaching a belt during this automotive maintenance procedure are to:

There are numerous ways to classify the performance of linear-positioning devices such as ballscrews, belts, and rack and pinion systems. This section helps define the difference between accuracy and repeatability.

Low Profile Redi-Rail is a low-profile track-roller option that employs Gothic arch wheels running on hardened steel races. Can handle loads beyond 100 lb.

So we've all accepted the timing belt's importance, but that doesn't mean you have to spend your days worrying that your belt will force you to pay a large maintenance bill. Instead, you can act as the band director and keep that timing belt in check by watching its wear and arming yourself with the knowledge to replace it. Read on to learn about the wear of your belt, typical tools needed in a repair and how to replace it.

Think of the synthetic rubber timing belt, which is reinforced with fiber cords, as the drum major of car maintenance -- meaning it keeps everything in the engine in sync. When the engine is on, it's in constant, timed motion, thanks to the belt, the connection between the crankshaft and camshaft.

The buzzer sounds off; it's halftime. Your band takes to the field. Before you know it, though, the trumpets play off-beat, the cymbals slam into each other and the saxophone player simply walks off the field. This, although exaggerated, is what could happen if the drum major, the keeper of tempo, went missing. And in the world of automotive maintenance, visualizing this scenario can help illustrate the timing belt's role and what can go wrong without routine replacement.

This chapter differentiates several technical definitions as they relate to track-roller linear guides and profile rail linear guides.

You may not even think twice about your timing belt until it nears replacement time, but don't be lulled into a false sense of security because you haven't hit 60,000 or 100,000 miles (96,561 or 160,934 kilometers) yet on your timing belt. If you happen to be working on your engine and can see the belt, take a look for cracks, shredding or excessive slack.