Cam Bearing Freeze

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Cam Bearing Freeze
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Winter conditions put a tremendous strain on your car and on your driving. Winter also puts a strain on your fuel economy. In order to prevent a decrease in your fuel economy you need to be aware of some specific issues with regard to your car and your driving in the winter.

One of the two main characteristics of winter, cold temperatures, create conditions that lower your fuel economy. A car that is cold uses more fuel to start up than a warm car. The colder the car the more fuel it uses when it starts.

In cold weather, the engine of your car is harder to start. The oil in your car is thicker when it is cold and thus requires more energy to get it flowing. All the parts that are lubricated by this thicker oil require more energy to move them. More energy means that it will take more fuel to move the parts. Your engine will use more fuel to run until it warms up.

Cold temperatures also effect other parts of your car. The bearings, joints, transmission, power assisted brakes, and steering mechanisms will all require more energy to move them when they are cold. These mechanisms all depend on some fluids to operate. Like the engine oil these fluids will be thicker in cold weather and will require more energy to move them. Again that translates into more gas.

Other parts of your car will be stiff and may be frozen. Moisture in the air can condense and freeze on many car parts. Water from precipitation or from the road may have frozen on to part of the car. It will take more energy to move these parts. Wheel bearings, suspension systems and wheels themselves are some of the parts effected. The same applies, more energy needed to move these parts translates into more fuel burned and lower gas mileage.

Since your engine needs to overcome some temperature issues to lubricate itself in the cold you do need to give it a little longer to idle after starting than you would in the summer. But, I have to stress this, it only needs about 30 seconds of idling, no more. That little extra idling does affect your gas mileage.

Some things you can do to mitigate the affects of cold on gas mileage are: Park your car in a heated garage if available. Even a non heated garage may be warmer than leaving your car outside. It may be time to get rid of all the boxes in your garage and make room for your car.

Make sure you are using an oil that is recommended for your car in cold temperatures. The proper oil will flow better in cold weather thus reducing the amount of energy needed to start and run a cold engine.

In extreme cold climates an engine block heater will help keep the engine and oil warm thus avoiding a complete cold start. You will need a way to plug it in and keep it plugged in until you are ready to drive.

Don't wast fuel warming your car when you start it. You only need about 30 seconds of idling to make sure the oil is flowing sufficiently in the engine. Excessive idling beyond 30 seconds will rob you of gas mileage faster than anything else. Let the car continue to warm up as you are driving.

Although winter and the cold temperatures that it brings can greatly reduce fuel economy you can minimize it's affect. If you follow the simple steps outlined you can keep your gas mileage up at the level it should be.

Scott Siegel is the author of a 143 page manual of industry insider information on saving gas and money at the pump. Visit us to learn how you can get better gas mileage. Find out how to increase gas mileage.

Self-lubricating, Nonmetallic Bearings Handle Tough Jobs

Self-lubricating bearings make sense when relubrication is difficult or when operating conditions compromise liquid lubricants. Such bearings can also eliminate the need for special lubricants in food-processing equipment.Self-lubricated, nonmetallic Duralon bearings, for instance, use a filament-wound fiberglass epoxy resin matrix with a woven bearing element of Teflon and polyester. The bearings can be made in numerous shapes and inexpensively customized to work in a wide range of conditions, including harsh industrial environments.

For example, pneumatic cylinders fitted with Duralon rod bearings operate a rotary valve actuator on machines that fill "tote tanks" with liquid chemicals including solvents, soaps, oils, vaporous liquids, waxes, and corrosives. The cylinders have successfully completed tests to 80 million cycles at 0.5-in. travel under various load conditions.

Another application for the bearings are in winches and sheaves used aboard large cruising and racing yachts. Here, lubrication can wash out because bearings constantly see fresh or saltwater at temperatures ranging from below freezing to tropical. In this environment, needle bearings tend to bind, while plastic bushings can swell and seize. The Duralon bearings tolerate the harsh conditions and reduce friction.

Self-unloading barges are yet another application for the nonmetallic bearings. The bearings support huge cylinders that position booms as they unload taconite, gravel, calcite, and other bulk mineral cargo. The combined weight of boom and cargo can reach nearly 200 tons.

Lifting and lowering the boom is a hydraulic cylinder mounted above it at the pivot end. The 21-in. bore 125-in. stroke cylinder, weighing more than 22 tons, attaches to the supporting structure by a yoke with a vertical pin. The vertical pin rotates on a Duralon bearing. The bearings see ambient temperatures from over 100°F to under 20°F, plus moisture and dust. The self-lubricating bearings reduce the amount of lubricant needed to prevent corrosion of the large-diameter shafts.

In another application, threesided square Duralon bearings are used in equipment that sprays lubricant on dies between casting cycles. The motor-driven unit moves aside for die removal and replacement. The portion of the machine and manifold supported by the bearings weighs about 500 lb.The previous design used a cam follower on which the upper part of the machine moved. However, the followers needed periodic lubrication. The open-square bearing, in contrast, needs no external lubrication. It rides on a 0.75-in.-square rail that bolts against a plate, which supports the rail along its length.A conveyor system uses hexagonal-shaped, nonmetallic bearings to eliminate a separate drive motor. The precision machines deliver plastic, multiwell vessels, from each of three conveyor lanes, to a multisyringe aspirate-dispense instrument.

A variable-speed dc motor drives the shuttle mechanism though a timing belt and hex shaft. Two 0.375-in. hex-bore Duralon bearings epoxy into a crowned aluminum drive tube. The tube slides along the stainlesssteel hex shaft. Linear travel speeds are about 24 ips. The hex bearings let the shuttle move perpendicular to the conveyor lanes and provide power at any point in its travel, without the weight and complexity of a drive motor on the shuttle itself. Less shuttle inertia shortens transfer times and boosts throughput. The self-lubricating bearing material meets critical outgassing specs as well.

Hydraulic cylinder rod ends are yet another application for the bearings. Here, spherical bearings combine with a splitsteel outer race to eliminate metal-tometal wear and galling. Dynamic load capacities to 30,000 psi are possible. Cylinders equipped with the bearings find use in construction equipment, agricultural vehicles, conveyors, packaging machinery, and scissors lifts. Mounted filament-wound bearings can fit round, square or hex shafts, in either two-bolt and fourbolt flange or pillow-block housings. Housings can be cast iron, stainless steel, or plastic. Various other bearing and ball-joint configurations are possible.

When selecting a self-lubricating bearing material, be sure to look at manufacturer test data and evaluate the material's B10 life. Rexnord has successfully tested Duralon bearings to 25 million cycles at a load of 4,000 psi, and 1,000,000 cycles at 20,000 psi, or about 8 longer than competitor composite bearings.

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I am a 26 yo who fell at home and suffered a left bimalleolar fx of my ankle.?

Open reduction internal fixation was done about 4 weeks ago and I am currently in a cam boot. Has any one else had this surgery or something similar? My ankle feels froze up (wont flex up or down fully) and I am worried about pain when I am able to walk or even loosing some range of motion in my ankle. I know my Dr said it would be about 10 weeks before I am able to be full wt bearing he also dosen't think I will need any formal physical therapy. Any comments/ suggestions?

I'm currently in a cast w/ a broken ankle. I've had other injuries before, and you *will* need PT. They're trying to save money for the insurance company by telling you you don't. Insist that he refer you to a physical therapist when you can bear weight, and if he won't threaten to go elsewhere.

2011 Gerald Loeb Award Finalists Announced by UCLA Anderson School of Management
Judy D. Olian, chairman of the G. and R. Loeb Foundation Inc. and dean of UCLA Anderson School of Management, today announced the finalists of the 2011 Gerald Loeb Awards for Distinguished Business and Financial Journalism.

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