Loosen the exhaust flange and gasket: Your flange may be stuck. The main types are ball and socket, U-bolt, flat band, and V-band clamps. Later, routine checks of bolt tension can be performed more often, and more quickly, so you know at a glance that the bolts are properly tightened. I checked mine several months ago but do not remember what I used for wrenches. What do they intend on doing to warm the entire motor??? SmartBolts can help prevent loose bolts – and the headache of leaks, breakage or equipment breakdowns – throughout the lifecycle of your application. Check the first hex nut that you tightened with the ratchet for tightness. « SmartBolts: Keeping the Power Flowing for Over 20 Years, Need for SmartBolts Technology Apparent at Off Shore Wind Energy Forum ». 8 years ago. Warm up the engine and … Disassemble the exhaust clamp by loosening and then removing the hex nuts from the U-bolt. Tonight as I was underneath shaking and banging on the exhaust to try and see if I could somewhat replicate the sound it seemed as if the entire system from manifold down had way too much play in it. I removed my exhaust manifold recently to replace a welch plug. Loose parts almost always lead to repair bills. Always place the exhaust clamp saddle on the top of the exhaust pipe. A crucial component of engine building is setting the torque on head bolts. If the material of the bolt and the joint are different, large differences in temperature due to rapid environmental changes or cycling industrial processes can cause bolt material to expand or contract rapidly, possibly loosening the bolt. Then tighten the strap nearest the muffler. The 2 bolts that are holding the intermediate pipe to the cat right now are fresh -- last time I put in stainless steel bolts thinking that would prevent them from rusting and make it easier to remove next time the pipe needed changing. Head bolts on some engines vary in length and it is important that these bolts be replaced in their original location. Over time, and especially near high heat or corrosive chemicals, the gasket may “creep,” which means it loses its springiness, leading to loss of clamp force. If you can catch something as simple as a loose exhaust heat shield early, you'll avoid not only the charge a muffler shop would hand you for tightening one or two bolts, but you may potentially avoid paying to have an expensive factory heat shield replaced. Dynamic or alternating loads from machinery, generators, wind turbines, etc., can cause mechanical shock – a sudden force applied to the bolt or the joint – causing the bolt threads to slip relative to the threads of the joint. Numerous techniques are applied to get rid of this dilemmas. Most square taper crank arms should be 29 ft-lbs. Final tighten the top nut to 100-120 in-lbs (11.3-13.6 Nm). I have removed the exhaust mixing elbow to clean and check for corrosion and am now about to replace it. According to an article in Fastener + Fixing, the idea of using two nuts, a thick one and a thinner one (called a jammer nut), has been used for over 150 years to prevent loosening of bolted joints. Adhesives. Differential Thermal Expansion. Car: 2002 Honda Civic I just put in a new exhaust pipe. If you tighten the bolts too tight, you will bend the metal, or break it. Liquid adhesives, as well as heated thermoplastic coatings or solid adhesive patches, have successfully been used to ensure bolts in certain applications do not come loose. Repeat the process to tighten the other hex nut. Vibration, embedding, gasket creep, etc., can affect the preload of any bolt, including SmartBolts. If the nut is loose, re-tighten it. 3) Head bolts that enter the water jacket of the engine should have sealer applied to the threads. Wipe off any extra lubricant as it … My exhaust studs on my engine keeps coming loose, its the second time after i tightened it. Since ruining the thread on my fuel lift pump by over tightening a banjo bolt I am now very cautious about other bolts. Discussion Starter • #1 • Sep 25, 2009. my 600 mile service is coming up and I want to do it myself. There are at least five causes of loose bolts, which can occur separately or in combination: Under-tightening. If you tighten the bolts too tight, you will bend the metal, or break it. One may wonder “how to remove rusted exhaust bolts” easily from the automobiles. The torque is just a little bit snug, and no more. Because each solution can add to the cost of a bolted joint with additional equipment and man-hours for installation and maintenance, they should be critically evaluated before use. Double nuts. Pull on the exhaust clamp to ensure that it is tight, and then perform the same steps on any other exhaust clamps you need to install. Gasket creep. Near the back of the exhaust system where the exhaust pipe meets the muffler, there is a exhaust flange with two bolts and two springs attaching the pipe to the muffler, with a gasket in between. A normal 3" exhaust gasket can be picked up at any auto parts store for a few bucks. For example, wedge-locking washers help maintain preload by not allowing the bolt to self-rotate. This can lead to sideways slippage between sections, placing unwanted shear stress on the bolt that could eventually cause it to break. Sign up to get your copy of our 27-page report: BOLTING Basics, Tips & Best Practices, ©2021 Industrial Indicators. There should really never be a loose part underneath your car or truck. valve covers are torqued from 3 to 8 ft 1b,,,ok. The only way you can keep a bolt from coming loose is by using either a threadlocking compound or a … The most productive solution is always driven by the application. The only way you can keep a bolt from coming loose is by using either a threadlocking compound or a positive locking device (such as a cotter pin). A perfect 1/2-13 Grade 5 waxed bolt will break if it is tightened to 81 foot pounds because the K factor is drastically lower. Tighten the nuts on the closet bolts (that attach to the flange) such that the toilet is flat on the floor without rocking. That should be fine ,just keep an eye on it over the next few … Several types of locking washers have been developed, with flutings, ribs or teeth that dig into the surface of the joint during the tightening process, in order to prevent loosening. Tighten the bolts evenly, from the inside to the outside, as tight as you can with a wrench--no cheater bars allowed and no air tools. While these devices do prevent the nut from falling off the bolt, they generally do not help the joint maintain the specified clamp force. Using an impact wrench (if you have one) and the appropriate socket size, remove the bolts or nuts holding the old exhaust clamp in place. I removed my exhaust manifold recently to replace a welch plug. And since Loctite 271 releases at 482 degrees, you are right, that wouldn't work either. Each have their place in the exhaust system and you may find 2 or more styles of clamp on your factory system. I put the bolts back on pretty much as tight as I could (lots of leverage, lots of grunting) but it occurred to me later that maybe they were a bit hard to get off because they … Torque-ing bolts/nuts up to the correct tightness is important in stressed areas such as bolting the chassis to the sub-frames. In general, at the snug-tight condition the bolt clamping forces can vary considerably because elongations are still within the elastic range. Should I replace my exhaust manifold? … Conical, or Belleville washers, are cup-shaped washers that perform little better than spring washers in vibration tests. The most productive solution … Nylon or metal inserts inside a nut (sometimes called a “lock nut”) can add extra friction to prevent loosening. If you hear the sound of metal on porcelain, stop tightening. The easiest and most accurate way to verify that the proper preload is developed and maintained is through the use of SmartBolts. Mechanical devices. Lv 5. Tighten the bottom nut to 100-120 in-lbs (11.3-13.6 Nm). • A325 bolts require a washer under the element (head or nut) being turned to tighten the bolt (shown under the nut, above right) • A490 bolts require a washer under both the head and nut (AISC& NISD2000) Washers 7 • Grip is the distance frombehind the bolt … This week’s recommendation comes from Rory, who used it to remove the exhaust system from a Porsche 911.According to him, if you break those pesky bolts … However, simple split washers, sometimes called helical spring washers, have been found to actually loosen the bolt under vibration even faster than a joint with no washer. When carbon monoxide accumulates in your vehicle, it displaces oxygen and in high concentrations can cause you to pass out and possibly die from asphyxiation. If the joint has not been designed properly, or if the specified tension was not achieved on the bolt at the start, this embedment of the joint can lead to a loss of clamp force. I have purchased replacement socket head bolts in SS from ray at rdent, and plan to change them all this weekend. It may also prevent re-tightening of the joint to the proper tension. You should notice the exhaust pipe pulling in under the pressure of the exhaust clamp. Numerous techniques are applied to get rid of this dilemmas. Torque refers to how tight a bolt should be. Prevailing torque nuts. Place the saddle on the top of the exhaust pipe connection, slide the U-bolt into the saddle and thread one hex nut on each leg of the U-bolt. Vibration. Well, I made a tentative attempt to loosen one or two of the header bolts yesterday, but absolutely NO movement from them. If you have your factory manual in hand, and it’s telling you the 6 x 1.0 bolt you’re looking at should be tightened to 41 foot-pounds, you should investigate a little more before you attack it with the wrench. That should be fine ,just keep an eye on it over the next few weeks. I have removed the exhaust mixing elbow to clean and check for corrosion and am now about to replace it. Pull on the exhaust clamp to ensure that it is tight, and then perform the same steps on any other exhaust clamps you need to install. In a bolted joint, tightening the nut actually stretches the bolt a small amount, like pulling on a stiff spring. The standard is to use 20 to 30 foot-pounds of torque. An older mechanic taught me this trick to removing rusty exhaust manifold bolts after watching me snap off a couple. It did prevent the bolts from rusting, but I guess the heat got to them and froze the nuts right on the bolt. Warm up the engine and go through the tightening process again. lastly, tighten … If the nut is loose, re-tighten it. These fasteners should not be more than snug tight, at least enough to flatten the lock washers. Lockwashers don't work in cars. When the square shoulders get to the round hole just drive it into the wood. But I am wondering what kind of nuts I should use. Castellated nuts have a slotted end and are used with a cotter pin or wire that fits through a hole drilled in the bolt. For bolts equal to or greater than about ¾ in. It shows respect for customers' property. Period. The exhaust system of your vehicle directs exhaust fumes from the engine away from the passenger compartment of the vehicle. The intake and exhaust manifolds may be on opposite sides of the cylinder head, or they may be combined or bolted close together. 8 years ago. 2) Watch bolt lengths. Loose parts almost always lead to repair bills. Exhaust Joints If there has been a lot of exhaust system up-down travel because of a broken hanger, the clamps and joint may be damaged. Subscribe to our NewsletterKeep informed of our latest innovations in bolted joint safety and the solid science behind the only true measure of clamp force — tension. Tighten the bottom nut of the rear cylinder head exhaust flange to 9-18 in-lbs (1-2 Nm). One essential tool you must have is a good quality torque wrench. Here are five basic types of prevention methods: Washers. >engine head bolts to factory specs - some say when the engine is hot, >some say cold. That is pretty darn tight. Many bolted joints include a thin, flexible gasket between the bolt head and the surface of the joint to seal the joint completely against gas or liquid leaks. All Rights Reserved. Shock. Lv 5. However, vibration tests show that many bolt retention solutions are less than successful in preventing loose bolts, and mainly act to keep the nut from falling off. Grade 8 is fine and so is stainless. The rusted exhaust bolt never moves or bidges easily and one might have to apply certain methods to do so. Locate the bolts: These bolts can easily be found once the car is jacked up. The table in this article shows that by using this formula a 1/2-13 Grade 5 plain bolt should be tightened to 82 foot pounds, but the same bolt that is waxed only requires 41 foot pounds to tighten the same tension. Without one, you are like a ship without a compass at sea. Rinse and repeat, until the toilet is flat on the floor. YMMV. My 84 W350 needed a new starter, so I had to drop the header to replace it. Period. I don't want to over tighten the cheap Chinese studs in the block because I don't want to strip it. Inside of the slots there are two allen head bolts. Exhaust Clamps. Loose bolts are not just an irritating nuisance. I was trying to figure out what was the correct tightness on the leer camper bolts that go through the fiberglass and into the clamp in the track, dont want the fibreglass to crack, i choked up on a 3/8 ratchet and tightened it with my fingers till it was tight but still seems like it was putting alot of pressure on the fibre glass, how did you all do yours. Numerous clever gimmicks have been developed to lock a tightened nut into place on a bolted joint. These two facts present an inherent dilemma. A dirty bolt can throw off torque readings by as much as 20 ft. lbs. This expansion and stretching of the manifold bolts over numerous duty cycles eventually cause too much tension on the bolt(s), stretching them beyond capacity and causing them to fail. Wedge-locking washers work in sets of two, with each washer having opposite facing wedges that interact with each other and with the joint and nut surfaces to prevent self-turning of the bolt. 1998 Honda CRV. Using a long 1/2 inch swivel socket, tighten the top nut of the front cylinder head exhaust flange to 9-18 in-lbs (1-2 Nm). Lockwashers don't work in cars. Do not tighten the hex nuts, as this will hinder your ability to perform the next step. Put on your safety glasses and work gloves. Exhaust clamps not only hold the exhaust pipe together, but also ensure your safety by keeping dangerous carbon monoxide from entering your vehicle. If the engine has a V-configuration, there will be exhaust manifolds on the outer side of each cylinder bank, but … Slide the socket onto one of the hex nuts and tighten the nut until it is tight. Th tyre place I go to uses a torque wrench to tighten the wheel nuts, that is how it should be. 1 0. wayne. So I am chasing a rattle that sounds like a busted up catalytic converter. This protects the threads of the U-bolt and eliminates the chances that the hex nuts will be snapped off by road debris. Click here to find out more. Attached is a chart to help you but bear in mind that bolts through tubes may need thread lock instead as tightening to the correct torque may start to dent the tube. Even lightly torqued bolts can feel as if they are welded in place. In this way, transverse motions that may cause one nut to advance will not affect the second nut. Every vehicle has different levels of torque necessary to properly tighten its bolts. A modern application is a system using two nuts each having different sized threads which advance at different rates on a dual-threaded bolt. This may cause permanent damage to the joint finish or surface, which may be unacceptable, such as in critical aerospace applications where surface indentations may cause fatigue stresses. The design engineers who specify the tension on a bolt allow for a break-in period, during which bolt tightness relaxes to a certain degree. 1 0. wayne. Under constant vibration from the engine of an ocean freighter, loose bolts on a large piece of mining equipment work their way off the bolted joints and roll around the hull, inflicting further damage to the equipment. Same here and they ask what pressure I want in the tyres. 3. Do not tighten the hex nuts, as this will hinder your ability to perform the next step. Ok, maybe that was a bit harsh, but you should never use thread locker on head bolts. However, vibration tests show that many bolt retention solutions are less than successful in preventing loose bolts, and mainly act to keep the nut from falling off. The rusted exhaust bolt never moves or bidges easily and one might have to apply certain methods to do so. bolt head or the nut face (whichever is the face that is rotated). When setting the torque, reliance on the specifications set by design engineers is vital. The gasket itself acts as a spring, pushing back against the pressure of the bolt and the joint face. I didn't use too much torque to do this, but it doesn't seem right and I'm afraid my exhaust pipe will crack. Tonight as I was underneath shaking and banging on the exhaust to try and see if I could somewhat replicate the sound it seemed as if the entire system from manifold down had way too much play in it. Step 4. If you want new bolts (on a 308GTSi) they are M8 Hardness 8.8, 70mm. 3. A rotor with its blades separates from the nacelle and spins off a wind turbine, crashing to the ground. Embedding. Begin by torquing nut one, two and three to 20-ft.-lbs. It has 3 bolts , … Apply pressure to the exhaust pipe connection to ensure that the connection is fully seated. You want the hole as tight on the bolt as you can get it and still get the bolt through it even if you have to give it some help with a hammer. Because the insert on most lock nut styles only covers part of the internal threads, a strong transverse motion or shock can still cause the bolt to self-loosen. Step 5: Remove the bolts on the old exhaust clamp. However, a locking type of nut (PTN, or prevailing torque nut) is often specified to go on the stud. Since ruining the thread on my fuel lift pump by over tightening a banjo bolt I am now very cautious about other bolts. But if you still feel the bolts … A pressurized bolted flange joint assembly begins to leak, creating a safety hazard. If it doesn't leak, leave it alone. Remove the HEX nuts from U-bolt Put the saddle on the exhaust pipe but do not tighten the HEX nuts; Apply a pressure on the exhaust pipe connection to ensure the connection is fully seated; Select a socket from socket set that matches the size of the hex nuts and attaches it to the ratchet; Use the ratchet to tighten … As in, a typical plain carbon steel 6 x 1.0 mm bolt wants to be tightened to a maximum of 4.0 foot-pounds. However, breaking or drilling the bolt is the only option that strikes the mind at that time. A good bolted joint will be designed with the proper size and type of bolt and nut, and specify the optimal amount of tension to achieve the clamp force required to maintain joint integrity. The wedges are designed to add tension (stretch) to the bolted joint if the bolt begins turning due to vibration or shock, preventing a loss of clamp force. Typically only 10% to 15% of the overall torque is actually used to tighten the bolt, the rest is used to overcome friction in the threads and on the contact face that is being rotated (nut face or bolt head). The job of the toilet bolt is to help create a watertight seal between the toilet bowl and the toilet flange and to secure the toilet to the floor. If the joint is not quickly retightened, the application may begin to leak fluid or gas, the bolt may break, equipment may become damaged, or catastrophic accidents may occur. Can even move the bolts, they are so covered in rust, so I'll be cutting them off this weekend … Increase your leverage by extending the handle of the wrench with a piece of piping. This expansion and stretching of the manifold bolts over numerous duty cycles eventually cause too much tension on the bolt(s), stretching them beyond capacity and causing them to fail. Is there any way you could drill the heads of the bolts and lock wire them or use shake proof lock washers? You should notice the exhaust pipe pulling in under the pressure of the exhaust clamp. Tighten it down a bit on one side then the other, then do it again. This stretching, or tension, results in an opposing clamp force that holds the two sections of the joint together. Because each solution can add to the cost of a bolted joint with additional equipment and man-hours for installation and maintenance, they should be critically evaluated before use. Eventually, vibration will cause the bolt to “unwind” from the mating threads and the joint to lose its clamp force. Discussion Starter • #1 • Aug 13, 2006. Bolt the strap nearest the engine first to ensure the header sits properly on the engine. Installing Exhaust Manifold or Header Studs Installing Exhaust Manifold or Header Studs By John Aho Studs are designed to be fitted only "finger-tight" into their threaded hole in a casting. dia., snug position provided by an impact wrench is approximately equal to the tightness attained by the full effort of a man using an ordinary spud wrench. What is Proof Load of a Bolt and How is it Different from Yield Strength. A related idea is to fit a spring inside the nut, which firmly grasps the bolt threads and is designed to move in the opposite direction of the nut if vibration or other forces cause it to unwind. I put the bolts back on pretty much as tight as I could (lots of leverage, lots of grunting) but it occurred to me later that maybe they were a bit hard to get off because they were rusted a bit and also had threadlock applied. Nobody seems sure. The bolts will be located on the exhaust port. Exhaust Clamps. Apply heat if the lubricant and leverage aren't working. A friend of mine had a 142, and it had the same problem, he couldn't keep the muffler bolts tight. The combination of good bolted joint design, proper clamp force development, and suitable bolt retention devices can reliably secure a bolted joint against many of the challenges raised here. Select a socket from the socket set that matches the size of the hex nuts, and attach it to the 3/8-inch ratchet. Just as with vibration, this slippage can ultimately lead to loosening of the bolts. Because loose bolts are so common, an astonishing array of devices has been invented to prevent them from occurring. By definition, an under-tightened bolt is already loose and the joint does not have enough clamp force to hold the individual sections together. There should really never be a loose part underneath your car or truck. Sign up to learn aboutour latest innovations! If you tighten it too much, you can pull the closet bolt … Remove the allen head bolts, and pull the fin pieces off to expose the header bolts. If I were you I would use a flat gasket with normal bolts (spring bolts won't hold tight enough not to leak). MushMouth knows NOTHING about HD's, if he did, he would know that due to the location and angle of the exhaust studs, you generally can't gain access to them with a drill, the frame is in the way. If it doesn't leak, leave it alone. However, breaking or drilling the bolt is the only option that strikes the mind at that time. Tab washers have two tabs on opposite sides, which fold up to secure the bolt head or nut after installation, and may have teeth that can penetrate the surface of the joint to hold it in place. So I am chasing a rattle that sounds like a busted up catalytic converter. Should I replace my exhaust manifold? Most square taper crank arms should be 29 ft-lbs. If you get softer bolts and put on ANY CAR, you can imagine what might happen. Selecting an appropriate bolt retention device is essential to prevent loosening of bolts and maintaining proper preload. Experiments on bolted joints under vibration show that many small “transverse” movements cause the two sections of the joint to move in parallel with each other and with the bolt head or nut. Nylon inserts cannot be used in harsh chemical or high-heat applications, and typically can’t be reused because the bolt threads cut grooves into the nylon, diminishing its ability to hold after re-tightening. Therefore, it is vital that you properly install the exhaust clamps to eliminate carbon monoxide from entering your vehicle. Instead of trying to hold a gasket or part in place while fumbling with bolts, trying to align the bolts to their holes, the gasket or part can be dropped over the studs (so alignment poses no further problems). Look at the origional bolt head for the numbers before you replace them with any ole (similar) thing from Home Depot. U-Bolt U-Bolt Tighten the bolts evenly, from the inside to the outside, as tight as you can with a wrench--no cheater bars allowed and no air tools. Sign up to learn about our latest innovations! There are numerous style of exhaust clamps, and the type that your vehicle’s exhaust system uses depends on the car. Tighten it down a bit on one side then the other, then do it again. If you don't have an impact or air wrench, use a manual ratchet and socket or boxed end wrench to remove these bolts. This is apparently loose, as it's causing my exhaust to rattle. The problem is that they make it harder to disassemble the joint later. NO. To my mind, logic says it's "cold" >because they certainly don't fire up the engines on the factory assembly >lines before tightening down the head bolts?! Bolted joints are critical to the safe operation of many types of equipment in a wide range of applications, including power generation, manufacturing, mining, and transportation.
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