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Seat Belt Buckle Button Stop Universal kit- Grey/Black/Tan
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By Counterman
Dayco, a supplier of engine products and drive systems for the automotive, industrial and aftermarket industries, is expanding its timing chain kit line with 41 part numbers to cover another 49 million vehicles in operation (VIO). Additionally, the company is introducing the next generation of its AutoPartIQ inventory assessment tool—with new features for a more productive customer experience.
New Parts Bring Timing Chain Kit Coverage to 120+ Million
Dayco’s aftermarket team launched the line in 2022 due to the car parc shift from timing belts to timing chains at the OE level. The
link hidden, please login to view, which feature OE-quality components, cover high-volume light-duty engine applications. They include all the necessary components for a thorough and complete repair, building on Dayco’s mission of recommending system replacement as a best practice. Dayco says the kits include: Timing and secondary chains that prevent stretch for the life of the kit – and address the no. 1 replacement issue; Precision-machined cam and crank sprockets for quiet, noise-free performance; Direct fit OE-quality, high-grade plastic guides, as well as VVT solenoids and cam phasers when the application calls for it; and Packaging that features a QR code that links directly to detailed installation instructions. Dayco backs its entire timing chain kit line with an industry-leading two year or 60,000 mile (96,000 kilometer) link hidden, please login to view, whichever occurs first, giving technicians confidence in what they’re installing. Three of the new part numbers are already available, and the remaining 38 are scheduled for Q1 or Q2 2025.
“We entered the timing chain kit market to meet the needs of our customers. The line continues to grow with sales increasing year over year and we are supporting our high-quality product line with important investments in warranty and training material,” said Tom Tecklenburg, Vice President, Aftermarket, Dayco North America. “We encourage our customers as well as shop owners to reach out to our tech team to schedule virtual training and to learn more about this line if they aren’t already stocking it.”
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By Dorman Products
Highlighted Part: Sliding Door Handle Repair Kit for Select Chrysler and Dodge Models
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By Counterman
While constant velocity (CV) joints are the most popular type of driveline joint in use today, universal or “U” joints are still in use on the driveshaft of many larger SUVs, trucks and vans. U-joints can handle a lot of torque, making them popular for these applications, but why did the CV joint rise in popularity? The question can be answered by looking at the operational aspects of a U-joint.
The basics are this: U-joints are located on the ends of a driveshaft, mounted between the driveshaft and a front and rear yoke. The front yoke attaches to the transmission and the rear yoke attaches to rear differential. As the engine moves from the effects of torque and as the suspension of a vehicle travels up and down, the angle of the driveshaft changes.
A U-joint does two things. First, it transfers the motion between the yoke(s) and driveshaft and, second, it does this at different angles, allowing for driveline movement. Here’s where the fun begins. When a yoke and the driveshaft are in perfect alignment, the velocity from one is transferred to the other at the same rate. However, when there is an angle between the two, the velocity of the driven member fluctuates continuously during rotation.
It can be hard to visualize, but the reason this happens is that as the angle of the U-joint changes, the two halves of the U-joint cross are forced to rotate on a different axis. The drive axis remains at a constant velocity, and the ends of the U-joint connected to it rotate in a consistent circular path at the same velocity.
The driven axis, however, rotates in a path which causes the distance of travel at the outer ends of the U-joint cross to increase or decrease in relation to the consistent points of the drive axis.
This effect results in the continuous fluctuation of velocity between the input and output sides of the U-joint. While the input remains at a consistent speed, the output speeds up and slows down as the points of the driven axis continuously alter between a long and short path of travel.
So, why don’t we feel that on a vehicle with a traditional driveshaft? Because there are two U-joints and the fluctuation on each end balances out, effectively allowing the driveshaft to provide a consistent output speed to the rear differential. The angle of the two joints must be the same, however, and it doesn’t take much wear in one for the angles to differ, and subsequently cause a vibration.
U-joints are known for their propensity to cause vibration, and an inherent disadvantage they have is the greater the angle of the U-joint, the greater the fluctuation in velocity. Anything over 30 degrees and the fluctuation dramatically increases.
The driveshaft I’ve described here represents the majority, but U-joints have also been used frequently in the past on the end of the front axles for a 4WD vehicle, and in the rear of independent rear suspension vehicles on the ends of short driveshafts, known as half-shafts. Have you ever noticed how jittery an old 4WD truck feels in the front when the hubs are locked, and you turn a corner? Now that you understand how the fluctuation in velocity of a U-joint changes as the angle increases, you know why.
You may have heard of a Double-Cardan U-joint. It is basically two joints side-by side with a common link-yoke in between. This is one of the original concepts for a true CV joint, and they are often referred to as this. The advantage they have is they offer smoother operation at greater angles, and they are common on 4WD trucks, and a common upgrade for lifted trucks where the driveshaft angle is altered considerably.
The drawback to a Double-Cardan joint is they are bulky, and they can still suffer from limitations due to operating angle. The operating limitations of a U-joint ultimately brought about the popularity of the modern CV joint, but the durability of U-joints means we’ll still be seeing them in certain applications.
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