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The Owj engine has been used in several Iranian products like Kowsar, Saeghe and Azarakhsh fighter jets or Yasin training jet.[8][9]

If a mechanic determines that any of your wheel bearings are worn out, you’ll want to have them replaced as soon as possible to avoid further damage to your vehicle.

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The fit was a success on the Quail, but again like the Viper it was later built with normal grade materials and subsequently used to power small jet aircraft, including the Northrop T-38 Talon, Northrop F-5, Canadair CT-114 Tutor, and Cessna A-37 Dragonfly light attack aircraft. More recently, J85s have powered the Scaled Composites White Knight aircraft, the carrier for the Scaled Composites SpaceShipOne spacecraft, and the Me 262 Project.

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Grease and a seal are crucial for protecting a wheel bearing. The seal keeps the grease clean from dirt and moisture. If it begins to deteriorate, the grease can become compromised, which may cause the wheel bearing to overheat and become faulty.

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The General Electric J85 is a small single-shaft turbojet engine. Military versions produce up to 3,500 lbf (16 kN) of thrust dry; afterburning variants can reach up to 5,000 lbf (22 kN). The engine, depending upon additional equipment and specific model, weighs from 300 to 500 pounds (140 to 230 kg). It is one of GE's most successful and longest in service military jet engines, with the civilian versions having logged over 16.5 million hours of operation. The United States Air Force plans to continue using the J85 in aircraft through 2040.[1] Civilian models, known as the CJ610, are similar but supplied without an afterburner and are identical to non-afterburning J85 variants, while the CF700 adds a rear-mounted fan for improved fuel economy.

Once the condition of your front or rear wheel bearings breaks down, your tires will wear out faster and can do so unevenly. Braking issues can occur. You also risk having your wheels lock up, which could lead to axle damage and other dangerous issues that are not worth the risk. Driving with a faulty wheel bearing is a safety hazard and not recommended.

Road conditions like potholes, speed bumps, dirt, and sand can wear down the seal over time. Wheel bearings are designed to last a long time, often more than 100,000 miles, and don’t require routine maintenance. But once they show signs of wearing out, you’ll want to replace them as soon as you can get your car to a mechanic. The cost will vary depending on several factors, so call a few shops and ask for an estimate for the replacement for your vehicle’s make and model—and don’t delay getting it replaced.

The J85-21 design replaces AM 355 chromium nickel molybdenum stainless steel alloy, used by previous J85 models for compressor rotors and blades, with a titanium alloy. Its inlet diameter was increased from 17.7 in (45 cm) to 20.8 in (53 cm), and it included an added stage ahead of the base 8-stage compressor for a total of 9 stages. Its multiple disk rotors were replaced with a single-spool rotor, thus improving dry thrust to 3,600 lbf (16 kN) and wet thrust to 5,000 lbf (22 kN) while reducing mechanical complexity along with the weight gain of the J85-21 model.[2]

Worried you might overpay for your wheel bearings replacement? Use Jerry’s GarageGuard to get a fair cost estimate for your wheel bearings replacement.

Andrea Richard is a writer and editor with nearly 15 years of experience crafting content for a variety of industries. In writing for Jerry, Andrea’s mission is to deliver relatable and informative content so readers can better understand the costs associated with car ownership and car leasing. A native Floridian and a road trip enthusiast, Andrea first learned to drive on a Honda Accord when CDs were still a thing. She has served on the Society of Professional Journalists Florida board of directors and volunteers as a judge for national journalism contests. Her work has earned several awards for feature writing, investigative reporting and branded content campaigns.

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The J85 was originally designed to power a large decoy missile, the McDonnell ADM-20 Quail. The Quail was designed to be released from a B-52 Stratofortress in-flight and fly for long distances in formation with the launch aircraft, multiplying the number of targets facing the SA-2 surface-to-air missile operators on the ground. This mission demanded a small engine that could nevertheless provide enough power to keep up with the jet bomber. Like the similar Armstrong Siddeley Viper being built in the UK, the engine on a Quail drone had no need to last for extended periods of time, so therefore could be built of low-quality materials.

The most advanced variant in the J85 series is the J85-21 model designed specifically for the F-5E/F during its development process.[2]

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Hub style wheel bearings, the most common version used in modern vehicles, cost around $80 to $300 each. Don’t be alarmed if your mechanic says you need a new hub assembly, as this just means that the wheel bearings were installed inside the hub assembly at the factory, making it one complete part.

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You don’t need to replace all four if one is faulty. You can just replace the single bad bearing—you don’t need to do the replacement in pairs like you would with new tires.

The Iranian Ministry of Defense constructed a new engine based on the General Electric J85-GE-21B named "OWJ" and presented it at a defense exhibition on 22 August 2016.[4][5][6][7]

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Everett Cook is an award-winning journalist and editor with more than 10 years of experience across a variety of industries. In editing for Jerry, Everett’s mission is to help readers have a better understanding of the costs of owning or leasing a car and to better understand their vehicle in terms of insurance and repairs. Prior to joining Jerry, Everett was an editor for Axios. His previous work has been featured in The New York Times, The Los Angeles Times, The San Francisco Chronicle, The Atlantic, Atlantic Re:think, The Boston Globe, USA Today, and others. He’s also been a freelance writer and editor with experience in SEO, audience building, and long-term content roadmaps. Everett is a proud graduate of the University of Michigan.

Your vehicle’s make and model, the type of bearings and parts used, labor rates, and where you have it serviced all factor into the cost you’ll pay for a wheel bearing replacement.

The range of the cost of labor for a wheel bearing replacement should be approximately $150 to $200, but auto mechanic labor costs can vary wildly depending on the region and the level of expertise needed to fix the problem.

Wheel bearings are a workhorse. They are crucial to your vehicle’s steering, handling and suspension because they join the wheel to the axle, enabling it to turn with limited friction. Replacing one wheel bearing can cost $350 or more on average in parts and labor, which means replacing all four in your car could cost more than $1,400.

Worn-out or damaged wheel bearings cannot be repaired and instead need to be replaced, ideally by a professional mechanic.

The basic engine design is quite small, about 17.7 inches (45 cm) in diameter, and 45.4 inches (115 cm) long. It features an eight-stage axial-flow compressor powered by two turbine stages, and is capable of generating up to 2,100 lbf (9.3 kN) of dry thrust, or more with an afterburner. At full throttle at sea level, this engine, without afterburner, consumes approximately 400 US gallons (1,500 L) of fuel per hour. At cruise altitude and power, it consumes approximately 100 US gal (380 L) per hour.