
Harley-Davidson motorcycle enthusiasts often discuss the appropriate torque screw size for the derby cover. The general consensus is that the screw size is 1/4-20 x 5/8, with grade 8 bolts and a T27 bit. While some recommend using a torque wrench to tighten the screws, others suggest simply tightening them by hand or with a standard-sized screwdriver handle. Over-tightening the screws can lead to stripped threads, so it is important to be cautious when applying torque. Some riders choose to replace the original Torx head screws with Allen head screws to prevent stripping and allow for more leverage when tightening.
What You'll Learn
The screw size for the Harley Davidson Road Glide Ultra Darby Cover is 1/4-20 x 5/8
When removing the Torx bolts, it is recommended to use a T27 bit to avoid stripping the bolt. Grade 8 bolts should be used for the 1/4-20 x 5/8 derby cover screw size. It is important to note that over-tightening the screws can cause leakage. Therefore, it is recommended to tighten the screws to a torque of 84-108 in. lbs. for the Derby Cover. This torque specification is the same for all Twin Cam motors.
Some Harley-Davidson models, such as the Dyna Low Rider, have a slightly different torque specification for the Derby Cover, which is 84-108 inch (7-9 ft.) lbs. It is always advisable to refer to the service manual for the specific torque specifications of your Harley-Davidson model.
Additionally, when working with screws and bolts, it is important to clean the threads and use a suitable torque wrench to achieve the correct torque. Using locktight or sealers on the threads can affect the torque achieved, potentially leading to over-torquing and damage to the fasteners.
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Use a T27 bit to remove the Torx bolts
To remove the Torx bolts from your Road Glide Ultra Darby cover, you will need a T27 bit. This is because the bolts require a Torx 27 (T27) fitting.
You can find T27 bits in a variety of lengths, including 1", 2", 3", 4", 5", and 6". They are also available in packs of various quantities, such as 2-packs, 4-packs, 5-packs, and 10-packs. Some T27 bits are also labelled as "tamper-proof" or "tamper-resistant".
When purchasing a T27 bit, ensure that it is compatible with your tools and that it is the correct size for your bolts. It is also important to note that over-tightening bolts can cause issues, so be sure to use the appropriate torque when reinstalling the bolts.
- Use a T27 bit of appropriate size and length for your bolts.
- Ensure that the T27 bit is compatible with your tools.
- Be careful not to over-tighten the bolts when reinstalling them.
- Consider using a torque wrench to apply the correct torque when reinstalling the bolts.
- Store your T27 bit safely when not in use to avoid misplacing it.
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Use a T25 bit with caution as it may strip the bolt
When removing the Torx bolts from the derby cover, it is recommended to use a T27 bit. While many use a T25, this can result in stripped bolts. The T25 bit is smaller than the T27 and can cause the bolt to strip, making it difficult to remove.
The T27 bit is specifically designed to fit the Torx bolts on the derby cover and provides a more secure fit. By using the correct bit size, you can avoid the risk of stripping the bolts and ensure a smoother removal process.
It is important to note that the derby cover bolts are not made of particularly strong material. Using the incorrect bit size or applying excessive force can easily deform the bolt heads, requiring the use of a drill and an easy-out to remove them. Therefore, it is always recommended to use the T27 bit to avoid any potential damage.
Additionally, when working with Torx bolts, it is crucial to clean the threads of the bolts and the threaded holes before reinstalling the bolts. Any residue or locktight/sealer on the threads can affect the torque and lead to over-torquing, potentially stripping or breaking the bolts.
In summary, when working on the derby cover, always use the T27 bit to avoid stripping the bolts. This will make the process safer and help prevent any unnecessary damage to your motorcycle.
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Use grade 8 bolts
When replacing the TORX to Allen head screws for the Primary Cover of your Harley Davidson Road Glide Ultra Darby, it is recommended to use grade 8 bolts. Grade 8 bolts are specified for high-strength applications and are commonly used in heavy manufacturing, such as tractor and truck fabrication. They are typically made of a medium carbon alloy steel that is plated in zinc for extra resilience and can withstand a minimum strength of 130,000 psi.
Grade 8 bolts are the strongest and hardest hex bolts available and are ideal for constructions or automotive use. They are available in a wide variety of lengths, with the extra length obtained by extending the grip length, increasing the thread length, or both, depending on the specific application.
When selecting grade 8 bolts, it is important to consider the technical specifications, such as the thread, shank, or root diameter, to ensure they fit perfectly. You can identify a grade 8 bolt by the six radial lines stamped into its flat, hexagonal head.
Grade 8 bolts are also known as hi-strength/high-tensile fasteners and are used in various industrial applications, including machinery, valves, pumps, motors, and tanks. They are highly engineered products, and their manufacturing process differs from other bolts, making them unique and specifically suited for demanding applications.
By following these instructions and using grade 8 bolts, you can ensure a secure and reliable fastening system for your Road Glide Ultra Darby cover.
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Torque settings for the T-27 screws are 84-108 in. lbs
When it comes to torque settings for the T-27 screws on a Harley-Davidson motorcycle, it's important to adhere to the specified range of 84-108 inch-pounds (in. lbs) or 7-9 foot-pounds (ft lbs). Exceeding this range can lead to over-tightening, which may result in stripped or broken screws and even damage to the softer aluminium threads in the primary cover.
The T-27 screws are typically used for the Derby cover on Harley-Davidson models like the Road Glide. It's crucial to use the correct tools and techniques when working with these screws to avoid damage and ensure a proper seal. While some experienced mechanics may rely on their wrist or a standard screwdriver handle to achieve the desired torque, others prefer the precision of a torque wrench.
When removing T-27 Torx bolts, it's recommended to use a T27 bit to avoid stripping the bolt. Many people mistakenly use a T25, which can lead to stripping. Upgrading to Allen head screws can provide more leverage and reduce the likelihood of stripping. Additionally, using a star pattern when tightening screws can help ensure an even distribution of force.
It's worth noting that Harley-Davidson applies a type of thread-locking adhesive and sealer to many of their bolts and screws. When reinstalling fasteners, it's important to clean the threads and use new locktight to achieve the correct torque and prevent leaks.
For Harley-Davidson owners, it's essential to refer to the service manual or a trusted forum for specific torque settings and maintenance advice. While this information provides a general guideline, each model may have unique specifications.
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Frequently asked questions
The torque screw size for the derby cover is 1/4-20 x 5/8. Use grade 8 bolts and a T27 bit when removing the Torx bolts.
The torque setting for the derby cover is 84-108 in. lbs.
No, it is not necessary to replace the screws every time. However, some people choose to do so as the factory screws can be over-tightened and difficult to remove.
Allen head screws are sturdier and more readily available. They also don't require a special socket or wrench, making them more convenient for DIY fluid changes.
The torque for the derby cover screws on a Dyna Low Rider is 84-108 inch lbs. (7-9 ft lbs).