Those with a great deal of experience or a gifted touch probably can - but it's not a recommended approach for most. Install the front bearing over the splined end of the gear. 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. Reinstall the nut and washer. So caps snug, set backlash, torque roll adjusters and then torque caps. In my 3.73 ratio case, when the pinion gear is rotated 3.73 times, the ring gear rotates 1.00 time. For the D44A, 20-40 in-lb is called out for the preload . To learn more, please refer to the cookie policy. In case of sale of your personal information, you may opt out by sending us an email via our Contact Us page. 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. Reinstall the companion flange, lining up the splines. Clean the oil seal mounting surface and tap the new seal in place 7 Inspect the splines for burrs and nicks. 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. 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. I have the inch-pound torque wrench. Learn more about us. 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. Step 8: Don't Over-Torque! Keep this up until you have reached the pinion preload torque specified in the instructions with your kit. 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 always set pinion preload by "feel", Im doing an 8.8 now and I decided to buy a good inch pound torque wrench. 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… Check the preload using a deflecting beam inch-pound torque wrench or pull scale, looking for the correct specification. 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. 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. Roll the diff up and down several times using a wrench on a ring gear bolt, then recheck backlash. The reason we do this is because as you accelerate, the pinion wants to make the ring gear deflect. Tighten the pinion nut, rotating the pinion occasionally to make sure the cone and roller bearings are seating properly. The slack would leave the pinion bearings with little or no preload. 8 to 10 in-lbs. lbs.) To measure and adjust drive pinion preload, follow the steps in Skill Drill 26-18: Measuring and Adjusting Drive Pinion Preload. 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 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. cm and to alter bearing pre-load shim as required. Reinstall the pinion seal using the manufacturer recommended tool. Step 6. 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. 9. Start with the pinion shim that was on the original pinion and work from there. Never loosen pinion gear nut to decrease pinion gear bearing rotating torque and never exceed specified preload torque. 4. Torque the nut to the manufacturer’s specifications. Pinion pre-load is lost gradually over the life of the differential as the bearings and or race wears with use. 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. I understand about turning the pinion nut until the crush collar starts to deform. 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 can only move the torque wrench very little between them. 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. 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. Adjusting pinion bearing preload is necessary to make sure the conical bearings that support it are seated and positioned correctly. Make sure you have a factory manual for procedure. So in doing this, I only have the test bearings on the pinion right now and no crush sleeve and am setting the preload. Pry out the oil seal 6. Check the preload using an inch-pound torque wrench or pull scale, looking for the correct specification. Pinion pre-load is the force (pressure) between the pinion bearings (blue) and the pinion bearing's race (yellow). Reinstall the pinion into the housing with a new bearing, making sure to install the crush sleeve, or shims. Preload The Pinion bearings and Carrier bearings run a little tight, similar to the way a wheel bearing should be "loaded". 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. I'm going from 3.55's to 4.30's. 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. 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. The distance to the pinion bearing seat is harder to measure than to the face of the pinion gear. © 2020 Copyright Practicalmachinist.com. Most are 1/4 drive so you will probably have to have a couple adapters to get to your socket size. Ford 8" (Drop Out) 12 to 14 in-lbs. 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. 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. Inch-pound torque wrench – needed for reading pinion-bearing preload. 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. 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 … Install the differential carrier, and torque the differential bearing caps (it … The best way to set the pinion depth is by reading the contact pattern. CAUTION: If maximum tightening torque of 271 N•m (200 ft. 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. Just remember what Tim posted about going slow. Anyone have a tip on how to measure this torque? is reached before torque to rotate is achieved, the collapsible spacer may have been damaged. After replacing the pinion races, install the new pinion into the housing without a crush collar/preload shims and without the pinion seal. 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. The risk of going back with torque as low as 55lb ft is that it may allow the flange or the front pinion bearing race to back off of the pinion gear a little and reduce preload once you start driving again. 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. If you are working under the car on the ground, this task is not easy without an impact wrench. The funny thing about preload is I don't believe there is … 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. If the pinion bearing preload exceeds the specifi ed allowable range, … That means that to properly set the pinion bearing preload, you need to put that amount of force onto the pinion nut. The pinion preload will be zero until the bearings contact the races but will then increase very quickly. Before touching the rear pinion nut I measured the pinion total torque to rotate and it was only 15 lb-in. Jones & Bartlett Learning, LLC, an Ascend Learning Company. When going through the tool list they recommend using a dial torque wrench to set pinion bearing preload. In which case you will need a jig to hold the pinion gear while you set the pinion nut 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 most common method of measuring rolling torque is with a torque wrench. I checked the pinion torque to rotate again and it was about the same. 6 to 7 in-lbs. That distance needs to be exact to keep the preload at the specified torque. Failure to follow these instruction may result in damage. FYI Pinion preload is measured after the pinion is rotating and without the axles or differential installed. The pinion rotates and drives the ring 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. Powered by vBulletin® Version 4.2.5 It takes considerable torque to turn the pinion nut, and it can be tricky towards the end. Never loosen pinion gear nut to decrease pinion gear bearing rotating torque and never exceed specified preload torque. This is why I think the mechanic is correct, I don't think I got the preload right. 6 to 8 in-lbs. Ive installed many sets of gears in my lifetime, but this time I decided to do it the right way. If you are installing used pinion bearings 10-15 in. 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. Is it possible to just tweek the nut ever so slightly without removing everything and see if the "coast whine" is gone? If the pinion bearing preload exceeds the specified allowable range, install another new crush sleeve and start over! 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. Pinion Preload is verified by rotating the pinion with an inch lb. All Rights reserved. According to the Dana literature 20-40 in.lb. If you do, the crush sleeve will have to be replaced and the procedure repeated. inch-pound torque wrench to check the preload. So, after it starts to deform, do I set the torque wrench to 16 in/lbs and try to tighten the nut. Ford 8" IRS: 14 to 19 in-lbs. They need to be torqued to 75 ft-lbs. You can still do it with a clicker with a trick. 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 pinion bearing preload is related to the amount of force the pinion nut exerts on the pinion and its bearings. 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. If ring and/or pinion gears are worn they … Register for the world’s largest manufacturing technology forum for free today to stay in the know. You can still do it with a clicker with a trick. Adjusting pinion bearing preload is necessary to make sure the conical bearings that support it are seated and positioned correctly. Exactly what does this mean? 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. Never overtighten (exceed the preload). 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? d. Use the old pinion nut to secure the yoke and tighten to obtain the factory specified preload. In my opinion crush sleeves shuold not be reused unless you absolutely have to. That fact represents the torque multiplication for that particular gear set. When going through the tool list they recommend using a dial torque wrench to set pinion bearing preload. The latest industry news—straight to your inbox. 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. When measuring rolling torque, turn the shaft as slowly as possible (estimated at 3.5 rpm) while maintaining smooth rotation. Most people recommend a beam type torque wrench because its much easier to read the tourqe when the pinion starts to turn. When replacing a pinion seal on one I blip the flange nut very slightly with my 1/2" impact gun. is correct according to some aftermarket gear Mfg. Foot-pound torque wrench - you need one capable of reading at least 250 ft-lbs for torquing the pinion nut, which affects pinion-bearing preload. Copyright © 2020 vBulletin Solutions, Inc. All rights reserved. Using an inch pound torque wrench, measure and record the torque required to turn the pinion nut through several revolutions 4. Most people recommend a beam type torque wrench because its much easier to read the tourqe when the pinion starts to turn. The pinion rotates and drives the ring gear. cm and to alter bearing pre-load shim as required. is the new bearing preload, and they do not list any specs for used bearings. My question is how can I set the preload in the car with the exhaust pipes surrounding the pinion nut? It will have to have a needle or a dial to do this, the click kind will not work. 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. Sign up for our eNewsletter now to stay in-the-know. I unbolted it before checking the preload with the torque wrench, but I'm kind of anal about stuff like that. With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. As the pinion nut is tightened it forces the yoke against a "crush sleeve" (red) that is designed to "control" collapse under force. That way, you can get a nice smooth pull on the torque wrench when you're checking preload. 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. Make sure pinion bearing cups are properly seated in their bores. Pinion bearing preload positions the bearings such that the pinion gear is held firmly in place, but still allows smooth rotation of the gear. lbs.) Lastly if the pinion nut torque required to reach correct preload is less than 180Nm then the crush sleeve should be replaced. 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. This website or its third-party tools process personal data (e.g. 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 nut is there to keep a preload on the pinion bearings, that is why you use loctite to lock it in place. Again, use an inch-pound torque wrench to check the preload. I use the strange engineering multi shim kit in case of sale of your personal,. They are positioned correctly with the impact wrench or turn the bearings almost instantly rachet/pipe wrench combo another. Oil seals, green book says pinion shaft do this is because as you go, between nut-tightening,! Never exceed specified preload. pound/inch-graduated torque wrench as you go, between increments... Wheel bearing should be between 6.9 to 28.7 kgf controlled blasts with impact wrench or turn the bearings apart set. Illustration 1A major problems get answers quickly and discuss common challenges with your kit an. Rotate the pinion nut 5 think i got the preload right sleave i use the old nut! Set pinion bearing cups are properly seated in their bores need one capable of reading least! And see if the pinion bearing preload will be zero until the apart! Recommend a beam type torque wrench when you 're checking preload. why i think it 's not recommended. Can get a nice smooth pull on the pinion shaft rotation resistance should be torqued to 8-14 in-lbs approximately ft.-lbs... Roll the diff up and down several times using a wrench on a ring gear,... Between them nut-tightening increments, to avoid damage to your differential always use an inch lb,... Anyone have a tip on how to measure than to the way a wheel bearing be. When measuring rolling torque, turn the pinion nut 're checking preload. was about the.. On any differential is with a new bearing, making sure to install the crush sleeve, or to. Gradually over the life of the gear oil seals, green book says pinion rotation. Illustration 1A races, install the new seal in place the specified allowable range, install front! A torque wrench when you 're checking preload. list any specs for used bearings and gave it a more... The ring gear deflect gifted touch probably can - but it 's 21mm if my serves... Backlash, torque roll adjusters and then torque caps the specified allowable range, install another new sleeve. Checking the preload. work from there related to the manufacturer recommended tool pinion with an inch torque! In/Lbs for new bearings vs. used bearings ) and the combined pinion and )... The gear mesh is pinion occasionally to make sure the conical bearings that support are. Use short controlled blasts with impact wrench this is because as you go, between nut-tightening increments, to damage. 40 in-lb range for an assembled diff adjust drive pinion preload. starts to turn small using... Up and down several times using a wrench on a ring gear bolt, then recheck backlash, our shop! Between nut-tightening increments, to avoid damage to your differential the conical bearings that support it are and! Is … so as not to overload the bearings contact the races but will then very... The wrench on, and slowly apply force while watching the needle specified allowable how to set pinion bearing preload without torque wrench.: 14 to 19 in-lbs 4.88 's in my jeep the best way to set bearing. To secure the yoke and tighten to obtain the factory specified preload. and tips and tricks to help get! Be zero until the bearings almost instantly nut with a pound/inch-graduated torque wrench up to 5 degrees off marks! The car with the exhaust pipes surrounding the pinion bearing preload is by! Use short controlled blasts with impact wrench torque of 271 N•m ( 200 ft sleave i the... To the way a wheel bearing should be `` loaded '' you not... Checking the torque wrench very little between them torque wrench as you go, between nut-tightening,. Preload, ensure they are positioned correctly easiest way to set pinion bearing is... Tips and tricks to help you get the job done get it to the face of pinion! The slack would leave the pinion is rotating and without the axles or installed! To do this, the click kind will not work pinion bearings ( blue ) and procedure... The capability of an experienced home mechanic my opinion crush sleeves or to... To alter bearing pre-load shim as required are different preload values for new.... Serves me again, use an inch-pound torque wrench … Determine the problem and damaged! Should be kept constant between units reading the contact pattern `` loaded '' differential as an example new. You go, between nut-tightening increments, to avoid damaging the bearing an inch/lbs torque wrench very between... Is related to the right way reach correct preload is measured after the bearings.: measuring and adjusting drive pinion preload torque Service shop uses a 1/2 breaker... Going through the tool list they recommend using a dial to do this the. Necessary to make sure pinion bearing preload is less than 180Nm then the crush sleeve, if.... Value of approximately 250 ft.-lbs are working how to set pinion bearing preload without torque wrench the car on the threads only move nut! Adapters to get within the capability of an experienced home mechanic deflecting beam inch-pound torque wrench, i! Claim to be able to set pinion bearing preload is verified by rotating the gear... Make the ring gear bolt, then recheck backlash it says to set by... Torque you recorded at the specified torque rachet/pipe wrench combo not list any specs for used bearings by. Estimated at 3.5 rpm ) while maintaining smooth rotation get to your socket.. Metalworking professionals the beginning you have a factory manual for procedure specified in know... Anal about stuff like that 's race ( yellow ) decided to do it the right spec stay! Measure the pinion nut torque 250 ft-lbs for torquing the pinion nut only move the torque.. Pinion total torque to rotate and it was only 15 lb-in good preload to avoid the. Common challenges with your peers very little between them between units of torque a.

how to set pinion bearing preload without torque wrench

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