Gary 69 vert 350 M20-373's 72 coupe 350,TH400,336's. There are two problems to consider with a pinion seal leak. I set bearing preload torque to rotate measured at 30 in-lbs (new bearing spec is 20-40in lbs). When you feel very little play, sneak up on the tightening (watch a reference mark on the socket; stop at 1/16" to 1/8" linear movement along the circumference) and check the bearing pre-load torque often to get 16-29 in-lbs (new) or 8-14 (old) (new bearings … Discussion Starter • #3 • Apr 3, 2005. One of the final steps in the bearing manufacturing process … Wiggle the pinion assembly as you tighten the nut to get an idea of how much more you need to collapse sleeve. So I replaced both pinion bearings and races after my outer pinion bearing went bad. When I set preload it goes from nothing to way too much in only a couple degrees of rotation. Everything was fine until about 2000 miles ago when I developed … The JK axles use crush collars to set preload, so if you crush it even more, you can have too much preload and wipe the pinion bearings. Too little rolling torque can mean the pinion isn't in alignment with bearing bores and can change your pinion depth and backlash. Button everything up and torque the bolts down. 16-28 in-lbs sounds about right if you install new bearings along with it, which you are not obviously. Too tight, and the bearings will be quickly damaged. If you are building a 78 vette diff, then your preload is too much. Too … To check preload on just the pinion bearings you have to remove the diff from the vehicle and remove the LSD carrier from the housing. Bearing sets consisting of three or four bearings have a heavier preload than sets with two bearings. The pinion nut should be torqued to 8-14 in-lbs. To set pinion bearing preload, use a holding tool to keep the pinion gear stationary. I’m using old crush sleeve and old pinion nut for “mock up”. Pinion bearing preload torque should increase about 3 in.lb. Most … I've been doing them this way professionally for 43 years without major problems. The preload of a linear bearing block is given as the percentage of dynamic load capacity that is induced on the bearing, with common preload amounts being 2, 5, and 8 percent. AST Bearings LLC is an ISO 9001:2008 certified company and supplier of precision bearings and bearing related products. As seen in the diagram, the bearing life … Turning the pinion gear nut crushes the spacer to obtain the specified preload. Double direction bearings. When replacing a pinion seal on one I blip the flange nut very slightly with my 1/2" impact gun. 13 JKUR. 17-20 on the pinion only, add 8-10 for total with the case installed. How long can you drive with a bad differential? Is there a similar test for the carrier shims? … There are two problems to consider with a pinion seal leak. You also need to remove the axleshafts to get a more accurate reading. This is a special metal sleeve that crushes with 300 to 400 ft-lbs of torque. To help, … However, you can also make your own meter cheaply. This spacer is placed between the bearings. Discussion Starter • #1 • Jul 30, 2010 (Edited) Okay here's the story, 6,000 miles ago, I had my rear end built by this guy who does transmissions and rear ends. total). If the pinion bearing preload exceeds the specified allowable range, install another new crush sleeve and start over! For general applications, the operating clearance range should be within the recommended zone shown in the diagram below. roaniecowpony Well-Known Member. Sorry for the newb question, I just don't want to build this thing up and have a carrier bearing fail because it was loaded too hard. If you are working under the car on the ground, this task is not easy without an impact wrench. Amazing deals on this 1In Travel Machinist'S Dial Indicator at Harbor Freight. Set the preload carefully (see “Specifications”) so that the bearings will have a long life. Save Share. Final check on backlash. too little side to side preload will result in the posi unit and ring gear deflecting away from the pinion gear under load.. too much preload will either distort the cast (spread it) or will kill the side bearings.. there was a great video that i thought i had bookmarked that described how to assemble the rear end and adjust bearing preload better than i have seen before.. it was … Afterwards I couldn't even get the pinion to move by hand! CASE BEARING PRELOAD.- The case bearing preload is the amount of force pushing the differential case bearings together. can I measure in-lbs to turn? 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. I did mine I get a little whine on de-acceleration but very minimal. That means that to properly set the pinion bearing preload, you need to put that amount of force onto the pinion nut. Could be too much preload but that sounds like gear whine or side bearings. On the other side of the spectrum, loosening the adjustment nut too much will cause excessive end play in the bearings, allowing a rocking motion that disrupts the even distribution of force along the rollers. Setting Pinion Depth Step 1 . I want to check pattern etc. Made sure it was in fully. Many air … Wheel bearings will also make a lot of noise when they go but tailshaft centre bearing isn't usually noisy til it's way to late. Crush Sleeves. Make sure to put some loctite on the threads! 132 Posts . For example, a bearing block with a dynamic load capacity of 30,000 N and a preload of 5 percent would experience a preload force of 1500 N. For roller bearing guides, which are typically used for … So usually it just causes the seal to … I believe this is a measurement of the amount of preload on the pinion bearings. 10 to 20 in-lbs. I go to install the carrier with the new bearings, pressed on fully, and it's a really tight fit. According to Currie, the average car crafter should strive for between 1 and 3 degrees between the tailshaft of the transmission and driveshaft, and 1 to 3 degrees between the driveshaft and pinion. Is there a way to know if I have too much carrier preload? Universal pinion setting tool so you can measure pinion depth of most automobiles and trucks. To find 11 ft/lb or 1.24 … If preload is too low (bearings too loose), … Too loose and they will also be damaged, and will not support the pinion properly. You need to check for the rotational force with an inch pounds torque wrench. Pinion bearing preload, assuming your pinion depth is correct which it should be since you haven't modified that, is set using a crush sleeve from the factory, or using a solid spacer and shims in the aftermarket (which I prefer). Keep in mind, preload does not equal the amount of thread showing on the coilover. Adding preload will not affect the spring rates or ride quality unless you have too much preload on the coilover. Onother thing to remember is the rolling torque should be lower for used bearings then new bearings. for the seal contact (13-15 in.lb. "The PDF then goes on to say "Plug-on joint flange and carefully tighten with a new slot nut until measured or recorded … Reply. Then check side clearance for the carrier bearings. The nut is there to keep a preload on the pinion bearings, that is why you use loctite to lock it in place. 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. 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. … A collapsible spacer is used to obtain the specified amount of pressure or preload. This step pertains to both the easy and hard ways for setting pinion depth. This preload prevents the sideways thrust that moves the pinion gear to the outside … John Wallace, Vice President of Operations for AST explains that in the case of ball bearings, preload is often a misunderstood concept and overlooked by both designers and bearing users alike. That’s how … The preload for these bearing sets is obtained by multiplying the values listed in the data table by a factor listed in table 1. • Pinion Bearing Splitter Tool (See image above) • Barrel sander or grinder • Drill or die grinder • Safety glasses • Ring and pinion installation kit. Pinion bearing preload is the tension placed on the pinion gear's tapered bearings. This takes the torque off the bearing and let's it complain more when you're on the throttle its got load on it . Bottom line it's not right. Too much preload kills bearings; not enough makes for a noisy ride. Pinions usually more effected on off throttle driving. The answer to this question would vary on a case-by-case basis and would depend on bearing type, size and operating conditions. Then a breaker bar or torque wrench can be used to tighten the pinion nut. 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. As with pinion bearing preload, it is critical. You have too much variance in drag, I suspect you have a bad bearing. Measuring this torque gives you a measurement to return to when reassembling things. Counting thread turns on the pinion nut isn't going to get you anywhere close to setting up preload correct. This means achieving an endplay between .001 inches and .005 inches. Then adjust side shims to provide 0.002" preload pinch each side on main bearings, and you're done. Preload: How much is too much? March 7, 2020 By Mike Santora Leave a Comment. There should not be much if any difference in drag CW or CCW. If you are using a crush sleeve and you find the preload is wrong, you need to get a new crush sleeve and start over, crushing it down by … Hopefully you changed both but you never know. The pinion came in at 18 in-lbs once I finally got the solid spacers set up right. Everything is replaced and I got the pinion bearing preload at 25~ in lbs with my beam torque wrench. More preload will increase the torque required to turn the pinion less decreases it. The key then is to hit the sweet spot between too much end play and not enough. The torque meter is useful for several other measurements in our cars, such as steering box adjustment, and other bearing and clearance-related torques. 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. What is the proper pinion angle? 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… Whether or not adding 1/2″ of preload to your coilovers will depend on the total extended length of that shock and where it sits at ride height. The carrier bearings really tightened everything up A LOT. What signs should I look for that indicate too little pinion bearing preload? Advertisement . Move the new pinion gear and bearings away from your work area to keep them clean. Though I set everything up with a … 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… 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. 296 Posts .
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