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how to set pinion bearing preload without torque wrench

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I always set pinion preload by "feel", Im doing an 8.8 now and I decided to buy a good inch pound torque wrench. .010" to .015" 60 ft-lbs. In which case you will need a jig to hold the pinion gear while you set the pinion nut torque. Gradually tighten the pinion nut in increments to a final value of approximately 250 ft.-lbs. Sign up for our eNewsletter now to stay in-the-know. 6 to 7 in-lbs. The reason we do this is because as you accelerate, the pinion wants to make the ring gear deflect. 8 to 10 in-lbs. When measuring rolling torque, turn the shaft as slowly as possible (estimated at 3.5 rpm) while maintaining smooth rotation. Take frequent cone and roller bearing torque preload readings until the original recorded preload reading is obtained by rotating the pinion with a Nm (inch-pound) torque wrench. torque wrench. If a 0.038 mm (0.0015-inch) feeler gauge can be inserted between pinion bearing cup and the bottom of its bore at any point around the pinion bearing cup, the pinion bearing cup is not properly seated. 5. The forces on the pinion gear are tremendous in that the driveshaft, which is connected to it, transmits the power to the pinion gear then to the ring gear and then to the axles and tires. Step 8: Don't Over-Torque! When I set the pinion bearing preload on the D44A I just set up I used a little craftsman clicker type and a handfull of adapters. Copyright ©. Pry out the oil seal 6. Pinion bearing preload positions the bearings such that the pinion gear is held firmly in place, but still allows smooth rotation of the gear. Pinion Preload (New) Pinion Preload (Reused) Ring Gear Backlash: Ring Gear Bolt Torque: Carrier Bearing Cap Bolts : Ford 7.5" 14 to 19 in-lbs. When installing the carrier, the same adjusters or shims that are used to adjust the backlash are also used to set the carrier bearing preload. i dont use the crush sleave i use the strange engineering multi shim kit. Either use short controlled blasts with impact wrench or turn the pinion nut a small amount using the rachet/pipe wrench combo. Those with a great deal of experience or a gifted touch probably can - but it's not a recommended approach for most. In order to check the preload, install an inch-pound torque wrench on the pinion nut and measure the preload without the carrier installed in the housing. Pinion pre-load is lost gradually over the life of the differential as the bearings and or race wears with use. At Randy’s, our service shop uses a 1/2” breaker bar, as shown in illustration 1A. If you are working under the car on the ground, this task is not easy without an impact wrench. It is very important to obtain good preload to avoid damage to your differential. If ring and/or pinion gears are worn they … Target is 28 in-lbs of rotational resistance for a unit on the bench with ring gear and posi installed, cover installed and the well filled with oil. When setting the pinion bearing preload on a crush sleeve design differential, it is always necessary to use a new crush sleeve every time the pinion nut is removed, or if the sleeve is over-crushed. Failure to follow these instruction may result in damage. ......On second thought, 180Nm is pretty insane to be torque lying on your back and having the car sit on jackstands...I'd hate to get half way through and then realize I can't even tow it to a hoist without removing everything. On types that use shims to control preload, ensure they are positioned correctly. I've been doing them this way professionally for 43 years without major problems. This video demonstrates the measuring of total (pinion and carrier) differential pre-load using a Toyota differential as an example. Clean the oil seal mounting surface and tap the new seal in place 7 Inspect the splines for burrs and nicks. Most are 1/4 drive so you will probably have to have a couple adapters to get to your socket size. “Experts” sometimes claim to be able to set this by feel. So, after it starts to deform, do I set the torque wrench to 16 in/lbs and try to tighten the nut. Torque-set. If the torque needed to rotate the assembly reaches the torque you recorded at the beginning. check the preload with a dail indicator inch pound torque wrench like the small SnapOn and with 30w oil on the bearings and WITHOUT the seal installed. Copyright © 2020 vBulletin Solutions, Inc. All rights reserved. Install the front bearing over the splined end of the gear. I cant seem to locate an inch pound torque wrench that measures low enough to set the preload, all the ones that I can get locally start at 30 inch pounds and most start above 100.has any one set their preload without using a torque wrench. FYI Pinion preload is measured after the pinion is rotating and without the axles or differential installed. If the pinion bearing preload exceeds the specified allowable range, install another new crush sleeve and start over! Pinion bearing preload positions the bearings such that the pinion gear is held firmly in place, but still allows smooth rotation of the gear. Register for the world’s largest manufacturing technology forum for free today to stay in the know. Ford 8" (Drop Out) 12 to 14 in-lbs. Make sure to put some loctite on the threads! Reinstall the companion flange, lining up the splines. Reinstall the pinion into the housing with a new bearing, making sure to install the crush sleeve, if equipped. So in doing this, I only have the test bearings on the pinion right now and no crush sleeve and am setting the preload. When replacing a pinion seal on one I blip the flange nut very slightly with my 1/2" impact gun. Too little preload will cause the carrier to move back and forth. The latest industry news—straight to your inbox. The crush sleeve keeps the bearings apart a set distance. Adjusting pinion bearing preload is necessary to make sure the conical bearings that support it are seated and positioned correctly. is reached before torque to rotate is achieved, the collapsible spacer may have been damaged. This is why I think the mechanic is correct, I don't think I got the preload right. It is perfectly normal to have 150-200 ft lbs of torque on the side adjusters. On assembling the differential pinion after changing oil seals, green book says pinion shaft rotation resistance should be between 6.9 to 28.7 kgf. I believe this means to tighten pinion nut til correct preload is reached indicated by torque required to turn the pinion, which you measured prior to disassembling. When setting the pinion bearing preload on a crush sleeve design differential, it is always necessary to use a new crush sleeve every time the pinion nut is removed, or if the sleeve is over-crushed. The only other 'special' tools you absolutely need is a 0-60 inch/lbs dial or beam type torque wrench to check the critical pinion bearing preload, and a dial indicator to check the ring gear backlash. (New bearings get more preload) It also helps to have the housing supported so that the pinion gear shaft is vertical with the nut pointing up. On assembling the differential pinion after changing oil seals, green book says pinion shaft rotation resistance should be between 6.9 to 28.7 kgf. Remove the pinion nut and clean threads on pinion gear and new pinion nut with carburetor cleaner, and install nut with Loctite 271(red) or 242(blue) and tighten down until proper pinion preload is obtained. inch-pound torque wrench to check the preload. Put the wrench on, and slowly apply force while watching the needle. Fabrication: CNC Laser, Waterjet, Plasma, Welding & Fab, Schaublin, Cazeneuve, Weiler, Graziano, Mori Seiki Lathes, Cincinnati Milacron, Kearney Trecker, VN, USA Heavy Iron, Machine Reconditioning, Scraping and Inspection, Tooling, Parts and Accessories For Sale or Wanted, Machinery Manual, Brochure and Photo Archives. d. Use the old pinion nut to secure the yoke and tighten to obtain the factory specified preload. Pinion Preload (New) Pinion Preload (Reused) Ring Gear Backlash: Ring Gear Bolt Torque: Carrier Bearing Cap Bolts : AAM 9.25" 15 to 25 in-lbs. All Rights Reserved. lb. It is very low and my torque wrench … Now my question is since most click type torque wrenches and a few other brand dial torque wrenches say their best accuracy is between 20 and 100% of the torque range would i be able to use this particular one 3/8 DR 150 IN LB DIAL TQ WRNCH Matco dial torque wrenches offer precise torque … Reinstall the nut and washer. This is adjusted by adding or subtracting shims located between pinion bearings (more shim = less preload) alternatively set by tightening nut with a crush sleeve in place, collapsing it until desired preload is achieved. 4. Check the preload using a deflecting beam inch-pound torque wrench or pull scale, looking for the correct specification. Never loosen pinion gear nut to decrease pinion gear bearing rotating torque and never exceed specified preload torque. I think it's 21mm if my memory serves me. The most common method of measuring rolling torque is with a torque wrench. You can tighten the nut in fairly big chunks until you get most of the play out of the pinion gear, but when you start getting close to zero play on the bearings, SLOW DOWN. To measure and adjust drive pinion preload, follow the steps in Skill Drill 26-18: 1 Reinstall the pinion into the housing with a new bearing, making sure to install the crush sleeve, if equipped. This is measured by checking the torque required to turn the bearings with a dial torque wrench. Ford 8" IRS: 14 to 19 in-lbs. Determine the problem and replace damaged or worn parts. 7) Use some adapters, and match that inch-lb torque wrench up to a socket that fits over the pinion nut. Make sure you have a factory manual for procedure. We'll bring you the most relevant peer-to-peer conversations happening in the trade and tips and tricks to help you get the job done. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. cm and to alter bearing pre-load shim as required. Pinion bearing preload is measured in inch-pounds and is a measure of the rolling resistance of the pinion bearings after proper torque has been applied to the pinion nut. If you cannot get it to the right spec and stay within 5 degrees of the mark, helms recommends rebuilding the diff. You can still do it with a clicker with a trick. Once pinion depth is achieved install new seal, loctite pinion nut, and using a new crush collar set pinion bearing preload to 15 inch-pounds rotating torque used bearing, and 25 inch-pounds with new bearings. The tapered bearings are adjusted to eliminate any play and then they are set a little tighter, making them a little "hard to turn". That way, you can get a nice smooth pull on the torque wrench when you're checking preload. Practical Machinist is the easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers. lbs.) Reinstall the pinion seal using the manufacturer recommended tool. Many air-impact wrenches are not capable of this kind of torque; you need at least a 1/2-inch-drive impact, if not a 3/4-drive unit. The pinion rotates and drives the ring gear. Setting Pinion Bearing Preload — Yukon Gear & Axle - YouTube If you are installing used pinion bearings 10-15 in. Tighten the pinion nut, rotating the pinion occasionally to make sure the cone and roller bearings are seating properly. When you tighten the pinion nut to about 200 ft lbs, if there is no crush sleeve or spacer between the bearings, it will definitely preload the pinion bearings, way way more than the 20 inch pounds you want. You should reach a point where the gears start to turn. I think what you need to do is tighten the pinion nut to below 180Nm and check the torque needed to rotate the whole assembly and keep on trying until you get to your recorded torque for rotating the assembly. Never loosen pinion gear nut to decrease pinion gear bearing rotating torque and never exceed specified preload torque. Knowledge of that ratio allows the calculation of carrier bearing preload after measuring pinion bearing preload and the combined pinion and carrier bearing preload. The pinion bearing preload is related to the amount of force the pinion nut exerts on the pinion and its bearings. Never overtighten (exceed the preload). Before touching the rear pinion nut I measured the pinion total torque to rotate and it was only 15 lb-in. Just remember what Tim posted about going slow. inch-pound torque wrench to check the preload. The best way to set the pinion depth is by reading the contact pattern. I measured the original sleeve and found one sleeve was really close and the other quite a bit shorter so I added the appropriate amount of shims to match the original for a starting point. If it is correct, move on. If not, repeat until it is. Ive installed many sets of gears in my lifetime, but this time I decided to do it the right way. When going through the tool list they recommend using a dial torque wrench to set pinion bearing preload. It says to set the "pre-load" to 16-29 inch/pounds of torque for a new bearing. KtG is correct that it should be in the 20 - 40 in-lb range for an assembled diff. I installed the new yoke and ran the pinion nut down with the impact wrench. Anyone have a tip on how to measure this torque? CAUTION: If maximum tightening torque of 271 N•m (200 ft. Recheck preload with an inch-pound torque wrench as you go, between nut-tightening increments, to avoid damaging the bearing. When going through the tool list they recommend using a dial torque wrench to set pinion bearing preload. You can still do it with a clicker with a trick. When the axle is set up during initial building, the pinion/flange nut is tightened until the resistance required to turn the flange is 30 to 40 lbs inch without the crownwheel assembly fitted. Using an inch pound torque wrench, measure and record the torque required to turn the pinion nut through several revolutions 4. is correct according to some aftermarket gear Mfg. This is a critical setting that should be done BEFORE backlash is set, once you get the bearings preloaded right, then you can start messing with adding or substracting shim thickness from side to side. The Sterling 10.5 uses a crush sleave to set the pinion preload instead of shims like a dana, so the amount of torque required on the pinion nut can vary. When I set the pinion bearing preload on the D44A I just set up I used a little craftsman clicker type and a handfull of adapters. Pinion bearing preload is measured without the carrier and ring gear installed, there is no accurate way to check pinion bearing preload with the differential assembly fully assembled. Not any easy job by any stretch... but well within the capability of an experienced home mechanic. Inch-pound torque wrench – needed for reading pinion-bearing preload. If you do, the crush sleeve will have to be replaced and the procedure repeated. second time ever doing gears, first was the rear end and it turned out ok... having a little trouble here. .011" to .016" 60 ft-lbs. I unbolted it before checking the preload with the torque wrench, but I'm kind of anal about stuff like that. 16-28 in-lbs sounds about right if you install new bearings along with … In my opinion crush sleeves shuold not be reused unless you absolutely have to. Using a suitable tool to hold the pinion flange and remove the pinion nut 5. Jones & Bartlett Learning, LLC, an Ascend Learning Company. Yes some people can feel the rotating force it takes to rotate the pinion gear however there is not a lot of difference in the amount the nut turns to go from the 15"/lb to the 25"/lb and then to have the bearings a little too tight. To learn more, please refer to the cookie policy. After replacing the pinion races, install the new pinion into the housing without a crush collar/preload shims and without the pinion seal. To find out more about the categories of personal information collected and the purposes for which such information will be used, please refer to our privacy policy. 9. Is there a ghetto way to find the correct pinion depth shim without pressing on and off the bearing trying different shims til I find the right one? I can only move the torque wrench very little between them. It takes considerable torque to turn the pinion nut, and it can be tricky towards the end. As the pinion nut is tightened it forces the yoke against a "crush sleeve" (red) that is designed to "control" collapse under force. The pinion rotates and drives the ring gear. lbs.) 60 ft-lbs. It will have to have a needle or a dial to do this, the click kind will not work. Powered by vBulletin® Version 4.2.5 Step 6. Example 15 to 25 in.lbs. That means that to properly set the pinion bearing preload, you need to put that amount of force onto the pinion nut. That distance needs to be exact to keep the preload at the specified torque. Preload The Pinion bearings and Carrier bearings run a little tight, similar to the way a wheel bearing should be "loaded". Well I'm installing my third set of gears but I've always had access to a pinion depth gauge tool, now I do not. Most people recommend a beam type torque wrench because its much easier to read the tourqe when the pinion starts to turn. 15 inch pounds for USED bearings 25 in/lbs for new bearings. You can move the nut up to 5 degrees off your marks to get within the 2-4 inch spec. This is adjusted by adding or subtracting shims located between pinion bearings (more shim = less preload) alternatively set by tightening nut with a crush sleeve in place, collapsing it until desired preload is achieved. Adjusting pinion bearing preload is necessary to make sure the conical bearings that support it are seated and positioned correctly. Remember that there are different preload values for new bearings vs. used bearings. This website or its third-party tools process personal data (e.g. cm and to alter bearing pre-load shim as required. for bearing preload. 10 to 20 in-lbs. The purpose of the pre-load is simple: it better braces the pinion in place against the side thrust from its contact with the crown wheel. The forces on the pinion gear are tremendous in that the driveshaft, which is connected to it, transmits the power to the pinion gear then to the ring gear and then to the axles and tires. Axles generally use crush sleeves or shims to set pinion preload. Lastly if the pinion nut torque required to reach correct preload is less than 180Nm then the crush sleeve should be replaced. The nut is there to keep a preload on the pinion bearings, that is why you use loctite to lock it in place. 60 ft-lbs. I have the inch-pound torque wrench. The slack would leave the pinion bearings with little or no preload. Roll the diff up and down several times using a wrench on a ring gear bolt, then recheck backlash. That fact represents the torque multiplication for that particular gear set. 6 to 8 in-lbs. browsing data or IP addresses) and use cookies or other identifiers, which are necessary for its functioning and required to achieve the purposes illustrated in the cookie policy. High/low, heel/toe. When installing the carrier, the same adjusters or shims that are used to adjust the backlash are also used to set the carrier bearing preload. I have a pinion depth tool, but almost never use it. You can try to do without, and use a “calibrated-by-feel” cheater bar or impact wrench but you will seriously compromise your set-up if you do. The correct torques should be between 2-4 inch pounds (not less than 2 nor more than 4). Now for setting the pinion bearing preload, I bought a crush sleeve eliminator kit that came with 2 sleeves (one longer than the other). In my 3.73 ratio case, when the pinion gear is rotated 3.73 times, the ring gear rotates 1.00 time. With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. Check the pinion bearing preload using the inch pound bar type torque wrench after each short blast with the impact wrench or small turn with the rachet and pipe wrench… Now my question is since most click type torque wrenches and a few other brand dial torque wrenches say their best accuracy is between 20 and 100% of the torque range would i be able to use this particular one 3/8 DR 150 IN LB DIAL TQ WRNCH I could feel it bottom and gave it a few more hits with the impact. The reason for this is that the pinion bearings are set up with what is known as pre-load, which can be thought of as the bearings are squashed together a bit rather than having play. Most people recommend a beam type torque wrench because its much easier to read the tourqe when the pinion starts to turn. So caps snug, set backlash, torque roll adjusters and then torque caps. The pinion preload will be zero until the bearings contact the races but will then increase very quickly. I will be pulling all the stock bearings off and making setup bearing out of them, i have new bearings to go in, I will see what I can do and let you all know what happens. is the new bearing preload, and they do not list any specs for used bearings. This wear can cause enough pre-load to be lost that the pinion will actually move when torque is applied or removed to the pinion via the driveshaft under engine acceleration or deceleration. Using the large torque wrench, torque the pinion nut down five more lb-ft and rotate the yoke with the inch-pound wrench again, checking the reading. The easiest way to set your preload on any differential is with an inch/lbs torque wrench. so as not to overload the bearings. I checked the pinion torque to rotate again and it was about the same. You could pull the flange back to set the preload again with the nut, but I would just apply a generous amount of torque to the nut again without disturbing the flange. Too much bearing preload will kill the bearings almost instantly. The idea is that the preload on the pinion bearings is set whilst the main part of the diff is removed from the axle casing. Is it possible to just tweek the nut ever so slightly without removing everything and see if the "coast whine" is gone? 8) Using that wrench, check your axle's preload. Again, use an inch-pound torque wrench to check the preload. My question is how can I set the preload in the car with the exhaust pipes surrounding the pinion nut? I have it to where it takes about 25 in lbs to get it turning and then it mellows out to about 10 in lbs. All Rights reserved. I always set pinion preload by "feel", Im doing an 8.8 now and I decided to buy a good inch pound torque wrench. According to the Dana literature 20-40 in.lb. Install the differential carrier, and torque the differential bearing caps (it … Make sure pinion bearing cups are properly seated in their bores. The funny thing about preload is I don't believe there is … Torque the nut to the manufacturer’s specifications. Pinion pre-load is the force (pressure) between the pinion bearings (blue) and the pinion bearing's race (yellow). is reached before torque to rotate is achieved, the collapsible spacer may have been damaged.

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