I am trying to see if the crush sleeve is being further compressed by hard launches or hard driving, which would lower the preload and affect backlash. CASE BEARING PRELOAD. Is Bad Moms 2 the same as bad moms Christmas? If preload is too low (bearings too loose), differential case movement and ring and pinion gear noise can result. As i have no idea of what the original bearing preload was( or number of turns on the nut), i have no idea of what it should be to re-install the new seal & new nut. Messages: 4,900. Reinstall the pinion into the housing with a new bearing, making sure to install the crush sleeve, if equipped. How does it compare with with a fresh setup? Pinion bearing preload too tight? If the preload is too loose, remove shims so that the bearings will be tighter against the races and increase the preload. School Bahauddin Zakaria University, Multan; Course Title BUSINESS 103; Uploaded By Tehseen123321. CASE BEARING PRELOAD.- The case bearing preload is the amount of force pushing the differential case bearings together. • A “whirring” noise while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload. Pinion Depth. As with pinion bearing preload, it is critical. 19COBRA93 Tire shredder Established Member. I tightened the nut further until I got 8 inch pounds, which should be about right for used bearings. Whirring noise only while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload, and almost never by bad ring and pinion gears. If the pinion nut had been left loose when you picked up the car you would have noticed it right away. Explain how pinion bearing preload is set Once the correct pinion depth is. I have a 2008 9-3 2.0T SS with 75,000 miles on it. The preload is achieved by means of a spacer between the two pinion bearings. Too much preload kills bearings; not enough makes for a noisy ride. I used the search function but could not find anything that covered my exact issue. This is a special metal sleeve that crushes with 300 to 400 ft-lbs of torque. The noise goes away as soon as I touch the accelerator. Set the preload carefully (see “Specifications”) so that the bearings will have a long life. Does this sound like a loose pinion bearing preload or something else? Discussion Starter • #1 • Jan 14, 2013. This condition is typically always diagnosed as a bad ring and Pinion gear. Wolves and dogs aren’t the only things that howl. Discussion Starter • #1 • Sep 1, 2012. It was loose before i tried to replace the seal. Does this sound like a loose pinion bearing preload or something else? To adjust non–rack-and-pinion worm bearing preload and sector lash, follow the steps in Skill Drill 28-16: 1. Using an inch-pound torque wrench, I checked the pinion bearing preload at roughly 75% of one turn and got about 4 inch pounds. 13). Pages 50 This preview shows page 20 - 23 out of 50 pages. Is it something I should be concerned about? What does a bad axle bearing sound like? I … If the preload is too tight then remove the pinion gear and add shims so that the bearings will not be as tight against the races. The installer should have used a new nut, it is fround upon to re-use a pinion nut, at least it used to be. 2. Proper preload allows the rolling elements to freely rotate in the bearing races, while excessive preload could lead to skidding. In this case, the gears typically aren’t the problem at all. I have a 2008 9-3 2.0T SS with 75,000 miles on it. I just finished up the final assembly of my rear end ('95 wagon with 4.56 gears). Joined Dec 4, 2018 Messages 1,539 Reaction score 1,370 Location 90505 Vehicle(s) JLUR, 14 GMC 1500 CC All TERRAIN Occupation Retired Engineer May 31, 2020 #2 Pete, I believe they should be the same rotating torque whether installing new or used bearings, at the time … Snoopy49 … Use an inch-pound torque wrench to check the preload. Add shims to decrease pinion bearing preload; Write down each shim-pack combination and its resulting preload when changing shims. What is the proper pinion angle? There are two problems to consider with a pinion seal leak. You want to get as close as possible to the correct amount of pressure, which is where a torque wrench comes in handy. Is it something I should be concerned about? If it is too loose, this will allow the gears to beat on each other, and you will eventually fracture or break teeth off the gears. A howl or whine during acceleration over a small or large speed range is usually caused by worn ring and pinion gears or improper gear set up. In this situation, the howling kicks in only when the vehicle is decelerating. The Pinion Preload is the rotational torque you would get if you placed a dial Indicating inch pound torque wrench on the pinion nut and turned it without the carrier installed, it measures the free rotational force required to turn the assembled pinion gear and is required so your Pinion bearings will fully seated and prevents them from being too loose. These sleeves will project the inaccessible spacer gap beyond bearing width and the preload loss was studied using three types of tapered roller bearing from 30306 series. Carrier preload tip: If backlash is within spec, but preload is too loose you can add equal amounts of shim thickness to each side of the carrier, or on tighten adjuster nuts equally. When a differential is set up this spacer is crushed by tightening the pinion nut; if the spacer is crushed too much, you get excessive backlash. Diagnosing Ring and Pinion Gear, Differential, Axle and Driveline Noise. If the preload is too tight then remove the pinion gear and add shims so that the bearings will not be as tight against the races. Cruiserdrew On the way there. The pinion gear is supported by two bearings, whose pre-loads are established by a crushable spacer between them. STEP 3: Pry out differential case, differential bearing cups and differential bearing shims until they are loose in the bearing caps. Broken pinion … Have you checked the pinion bearing preload on the used gears? SILVER Star. Either way, the rearend will be noisy. Crush Sleeves. Tightening up the pinion nut clamps all three items together (inner bearing, spacer, outer bearing). I suspect you now have some bad pinion bearings and maybe a a bad ring & pinion to boot. Setting the Pinion Bearing Preload Minus a Torque Wrench. To measure and adjust drive pinion preload, follow the steps in Skill Drill 26-18: 1. When I lift my foot off the gas pedal at times I will hear a soft whirring noise. A car with a loose pinion-bearing preload will often make a howling noise as gears are being changed. It’s easy to mistake this sound for tire noise. This kind of noise is almost never caused by bad ring and pinion gears. 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. noise? Advertisement . You are not measuring the correct parameter for torquing a pinion nut by using a click type torque wrench, so what torque you pick, is kind of arbitrary. Possible Cause #2: A second possible cause is the crush sleeve. However, it is fairly common as well for the failure to be caused by too much runout of the pinion, caused by either incorrect preload on the pinion, or failure of the pinion bearing, the former often being caused by the latter. As with pinion bearing preload, it is critical. If the pinion nut is loose, preload is the least of your problems. I bought the rear end freshly rebuilt. This will increase preload, while maintaining backlash setting. STEP 2: Loosen differential bearing cap bolts and bearing caps. This will increase friction and heat generation, which can ultimately lead to premature bearing failure. 1,078 Posts . If the preload is too loose then remove shims so that the bearings will be tighter against the races and increase the preload. When I lift my foot off the gas pedal at times I will hear a soft whirring noise. Noise is intermittent and seems less is I lift my foot off the gas pedal slowly. The shorter the spacer, the more the bearings are pushed together and so the higher the preload. Mar 4, 2014 #10. I was dinkin around with changing out the pinion bearing in my D44 today, got it all back together and backlash was still in spec but at the tighter end - .007". Whirring noise only while decelerating at any or all speeds is most likely caused by bad pinion bearings or loose pinion bearing preload. Once the correct pinion depth is established, the pinion bearing preload can be adjusted. Once you’ve achieved the proper preload, lightly tap both ends of the pinion to seat the bearings, races and yoke. The mounted bearing setting range is determined If preload is too high (bearings too tight), bearing overheating and failure can result. Do not strike the pinion too hard, as excessive force may damage the bearings. To set pinion bearing preload, use a holding tool to keep the pinion gear stationary. 92 Posts . Instead, it’s often a loose pinion yoke, bad U-joint, or worn transmission making the noise. That means that to properly set the pinion bearing preload, you need to put that amount of force onto the pinion nut. If preload is too loose you will be more likely to spin bearings and/or break gear teeth. Research the specified procedure and specifications for the adjustments. Loose Pinion Bearing Preload. Note direction of arrows on bearing caps. This spacer is placed between the bearings. This gave me about 95% of one turn total. - The case bearing preload is the amount of force pushing the differential case bearings together. Pinion bearing preload positions the bearings such that the pinion gear is held firmly in place, but still allows smooth rotation of the gear. Jump to Latest Follow 1 - 13 of 13 Posts. I mean, as i started to remove the nut, i checked it was very loose. Apr 2, 2012 #5 TS888 said: If the pinion nut is loose, preload is the least of your problems. Joined: Jul 9, 2003 Location: Clinton, Utah. After reaching the correct pinion-bearing preload, moderately tap both ends of the pinion to seat the bearings, races and yoke. Turning the pinion gear nut crushes the spacer to obtain the specified preload. If the preload is too loose then remove shims so that the bearings will be tighter against the races and increase the preload. Everything came together great, and the final pattern looked very nice. 69 Camaro, 12 bolt rear end, 3.73 with Eaton posi. Noise is intermittent and seems less is I lift my foot off the gas pedal slowly. This provides the way of adjusting the preload to the correct value. Joined Mar 15, 2003 Messages 15,921 Location Sacramento, CA. What signs should I look for that indicate too little pinion bearing preload? roaniecowpony Well-Known Member. Pinion bearing preload is the tension placed on the pinion gear's tapered bearings. Then a breaker bar or torque wrench can be used to tighten the pinion nut. 100%Saab. A collapsible spacer is used to obtain the specified amount of pressure or preload. Remove bearing caps and remove differential case from rear axle housing. When assembled, arrows must be pointing in same direction as before removal. Pinion depth is also spot-on. Drop the driveline and tighten the nut, or you will waste the bearing. Pinion depth is the distance from the axle center line to the end face of the pinion gear (checking distance). It must be sufficient to reduce the excess play, but care must be taken not to apply too much preload. With the steering gear removed from the vehicle and mounted in a vise, loosen the locknut and back off the sector shaft adjustment screw so it is not loading the worm gear. You can adjust or set the pinion bearing preload by turning the pinion nut to tighten or shorten the spacer. Once the pinion has been seated, recheck the pinion preload with your inch-pound torque wrench. Explain how pinion bearing preload is set once the. This collapsible space is generally used to get a more precise pressure on the bearing preload. • A “howl or whine” during acceleration over a small or large speedrange is usually caused by worn ring and pinion gears or improper gear set up. 17 March 2017. Loose pinion-bearing preload.