Register for the world’s largest manufacturing technology forum for free today to stay in the know. is correct according to some aftermarket gear Mfg. 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. Pinion Bearing Preload - Is the amount of rolling resistance on the pinion bearings. 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. Remember that there are different preload values for new bearings vs. used bearings. I think it's 21mm if my memory serves me. is the new bearing preload, and they do not list any specs for used bearings. 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 © 2020 Copyright Practicalmachinist.com. Never loosen pinion gear nut to decrease pinion gear bearing rotating torque and never exceed specified preload torque. Make sure pinion bearing cups are properly seated in their bores. The best way to set the pinion depth is by reading the contact pattern. Failure to follow these instruction may result in damage. I unbolted it before checking the preload with the torque wrench, but I'm kind of anal about stuff like that. You accept the use of cookies or other identifiers by closing or dismissing this notice, by scrolling this page, by clicking a link or button or by continuing to browse otherwise. I put a set of 4.88's in my jeep. When going through the tool list they recommend using a dial torque wrench to set pinion bearing preload. Practical Machinist is the easiest way to learn new techniques, get answers quickly and discuss common challenges with your peers. To measure and adjust drive pinion preload, follow the steps in Skill Drill 26-18: Measuring and Adjusting Drive Pinion 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. With more than 10.6 million unique visitors over the last year, Practical Machinist is the most visited site for metalworking professionals. Once the companion flange feels snug, turn the pinion nut in 1/8 inch increments, and then with each turn, check the turning tension with an inch-pound torque wrench. If you are working under the car on the ground, this task is not easy without an impact wrench. Reinstall the companion flange, lining up the splines. Axle builders generally measure the pinion’s preload by rotating the pinion gear by its nut with a pound/inch-graduated torque wrench. I installed the new yoke and ran the pinion nut down with the impact wrench. That means that to properly set the pinion bearing preload, you need to put that amount of force onto the pinion nut. I always set pinion preload by "feel", Im doing an 8.8 now and I decided to buy a good inch pound torque wrench. lbs.) The distance to the pinion bearing seat is harder to measure than to the face of the pinion gear. It takes considerable torque to turn the pinion nut, and it can be tricky towards the end. so as not to overload the bearings. It is perfectly normal to have 150-200 ft lbs of torque on the side adjusters. Most are 1/4 drive so you will probably have to have a couple adapters to get to your socket size. That way, you can get a nice smooth pull on the torque wrench when you're checking preload. Using a suitable tool to hold the pinion flange and remove the pinion nut 5. I have the inch-pound torque wrench. Lastly if the pinion nut torque required to reach correct preload is less than 180Nm then the crush sleeve should be replaced. 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. I have a pinion depth tool, but almost never use it. 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. All Rights reserved. 8) Using that wrench, check your axle's preload. If it is correct, move on. Tighten the pinion nut, rotating the pinion occasionally to make sure the cone and roller bearings are seating properly. (Don’t immediately tighten to full value, and keep rechecking preload.) Axles generally use crush sleeves or shims to set pinion preload. 6 to 8 in-lbs. Keep this up until you have reached the pinion preload torque specified in the instructions with your kit. Check the preload using a deflecting beam inch-pound torque wrench or pull scale, looking for the correct specification. Setting Pinion Bearing Preload — Yukon Gear & Axle - YouTube So in doing this, I only have the test bearings on the pinion right now and no crush sleeve and am setting the preload. Copyright © 2020 vBulletin Solutions, Inc. All rights reserved. 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. You should reach a point where the gears start to turn. 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. Make sure you have a factory manual for procedure. Sign up for our eNewsletter now to stay in-the-know. 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. Check the preload using an inch-pound torque wrench or pull scale, looking for the correct specification. My question is how can I set the preload in the car with the exhaust pipes surrounding the pinion nut? inch-pound torque wrench to check the preload. second time ever doing gears, first was the rear end and it turned out ok... having a little trouble here. The crush sleeve keeps the bearings apart a set distance. If you cannot get it to the right spec and stay within 5 degrees of the mark, helms recommends rebuilding the diff. Having done my share of GM diff's I always use an inch torque wrench. Just remember what Tim posted about going slow. Most people recommend a beam type torque wrench because its much easier to read the tourqe when the pinion starts to turn. Anyone have a tip on how to measure this torque? On types that use shims to control preload, ensure they are positioned correctly. The pinion nut should be torqued to 8-14 in-lbs. 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. I understand about turning the pinion nut until the crush collar starts to deform. Install the front bearing over the splined end of the gear. The pinion bearing preload is related to the amount of force the pinion nut exerts on the pinion and its bearings. The funny thing about preload is I don't believe there is … Never loosen pinion gear nut to decrease pinion gear bearing rotating torque and never exceed specified preload torque. Pry out the oil seal 6. So caps snug, set backlash, torque roll adjusters and then torque caps. 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. Determine the problem and replace damaged or worn parts. 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. Install the differential carrier, and torque the differential bearing caps (it … At Randy’s, our service shop uses a 1/2” breaker bar, as shown in illustration 1A. 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. Run the pattern and see where the gear mesh is. Step 6. is reached before torque to rotate is achieved, the collapsible spacer may have been damaged. If you are installing used pinion bearings 10-15 in. 4. 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. .010" to .015" 60 ft-lbs. 8 to 10 in-lbs. Knowledge of that ratio allows the calculation of carrier bearing preload after measuring pinion bearing preload and the combined pinion and carrier bearing preload. 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. All Rights Reserved. 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. 60 ft-lbs. Failure to follow these instruction may result in damage. In which case you will need a jig to hold the pinion gear while you set the pinion nut torque. It says to set the "pre-load" to 16-29 inch/pounds of torque for a new bearing. If the pinion bearing preload exceeds the specified allowable range, install another new crush sleeve and start over! 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. 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. lbs.) The pinion preload will be zero until the bearings contact the races but will then increase very quickly. 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. 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. 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. If the pinion bearing preload exceeds the specifi ed allowable range, … After replacing the pinion races, install the new pinion into the housing without a crush collar/preload shims and without the pinion seal. 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". In case of sale of your personal information, you may opt out by sending us an email via our Contact Us page. Install new pinion bearing cups with Pinion Bearing Cup Replacer. cm and to alter bearing pre-load shim as required. Now for setting the pinion bearing preload, I bought a crush sleeve eliminator kit that came with 2 sleeves (one longer than the other). Bearing rolling torque is influenced by rotational speed and applied lubrication.These should be kept constant between units. Is it possible to just tweek the nut ever so slightly without removing everything and see if the "coast whine" is gone? 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. Copyright ©. The tapered bearings are adjusted to eliminate any play and then they are set a little tighter, making them a little "hard to turn". i dont use the crush sleave i use the strange engineering multi shim kit. .011" to .016" 60 ft-lbs. inch-pound torque wrench to check the preload. Most people recommend a beam type torque wrench because its much easier to read the tourqe when the pinion starts to turn. Again, use an inch-pound torque wrench to check the preload. 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. Put the wrench on, and slowly apply force while watching the needle. Too little preload will cause the carrier to move back and forth. Powered by vBulletin® Version 4.2.5 Ford 8" (Drop Out) 12 to 14 in-lbs. This is why I think the mechanic is correct, I don't think I got the preload right. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. 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. Never overtighten (exceed the preload). The latest industry news—straight to your inbox. Step 8: Don't Over-Torque! Use an inch pound torque wrench to rotate the pinion shaft. 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. 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. It's not like a dana set up where you use shims to set the preload and the torque on the nut is always the same value (175 ft/lbs for a D60 if I remember correctly). If the torque needed to rotate the assembly reaches the torque you recorded at the beginning. 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. I always set pinion preload by "feel", Im doing an 8.8 now and I decided to buy a good inch pound torque wrench. That fact represents the torque multiplication for that particular gear set. 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… FYI Pinion preload is measured after the pinion is rotating and without the axles or differential installed. 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 … 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. The pinion rotates and drives the ring gear. 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. So, after it starts to deform, do I set the torque wrench to 16 in/lbs and try to tighten the nut. The reason we do this is because as you accelerate, the pinion wants to make the ring gear deflect. 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. 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. 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. 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. According to the Dana literature 20-40 in.lb.