how to set carrier bearing preload

AAM 9.25" IFS: 15 to 22 in-lbs. Once the pinion depth is properly set, the backlash needs to be adjusted and set. Join now! Anyone know if the differential bearing races in a Dodge 9.25" rear are locked in tight or "float" in the housing? Diff rebuild - how to set carrier bearing preload Ep.2 #1024. Remove the old gear set and clean the carrier and housing assembly thoroughly (including the axle tubes). My torque wrench is simply not that precise. It is perfectly normal to have 150-200 ft lbs of torque on the side adjusters. Diff rebuild - how to set backlash Ep. MIke. The carrier bearings must have some load on them for the unit to operate correctly. Preload the dial of the J 8001-3. The width is machined into the housing, and the carrier must be sandwiched in to get bearing preload. This will tell you if carrier bearing preload is correct. Diff rebuild - how to set backlash Ep. See all 64 photos Next a spanner wrench is used to set carrier bearing preload and ring-to-pinion backlash to manual specifications. For a better experience, please enable JavaScript in your browser before proceeding. This will tell you if carrier bearing preload is correct. One method is to set plain half adjuster ( the adjuster on the opposite side of the carrier to the ring gear) so it is one thread out then move the flange half adjuster till you have 0 backlash then go back additional 1 or 2 notches ( I think from memory) then you adjust the plain adjuster up till the bearing cup just starts to rotate then keep going a additional 2 notches now … im fitting an airlocker into the rear of my gu, what is the easiest way to set the carrier bearings preload? Diff rebuild - how to set carrier bearing preload Ep.2 #1024. This total carrier preload shim pack measurement will not change as you dial in the backlash. Total preload (in/lbs. Now it's pretty snug lifting the carrier out of the housing. Their position remained unchanged in operation. For a new pinion bearing I'm aiming for 20-25 in/lbs preload for the pinion alone. Shims may be located between the Inner pinion bearing & pinion head or they may be between the inner Pinion bearing cone and carrier housing. After setting the backlash, add equal amounts of shims to both sides of the carrier to set the carrier bearing preload as tight as possible without damaging the shims (carrier bearings in this axle design hardly ever fail due to excessive carrier bearing preload). AAM 10.5" 15 to 25 in-lbs. Carrier Bearing Preload – Is simply how tight the carrier fits in the housing and is set simultaneously with backlash. Most people are reluctant to really crank on these adjusters to preload the carrier bearings. Here is the formula. I've seen some check the amount of case spread with a dial indicator. just your normal everyday GQ... lift, muddies, cage and a td42 auto. See all 64 photos Next a spanner wrench is used to set carrier bearing preload and ring-to-pinion backlash to manual specifications. When an axial load is applied to the inner ring of the bearing, the race of the inner ring comes in contact with the rolling element and translates this load to the raceway of the outer ring. Side bearing adjustment video. 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. Everyone is pretty much in the same ball park. My Dad works on tractors and said he just measures the amount of space between the carrier bearings and housing, and adds however many shims over that space to give the preload. Carrier bearing preload is established by the tightness of the shims. I've seen some check the amount of case spread with a dial indicator. this works for me. Once the preload is set, you can use a punch to tap the pinion nut to help keep it from backing off. Mark. Proper preload keeps the case from wobbling inside the carrier and adjusts backlash between the ring and pinion gear. Then repeat the process with the carrier installed. ie: pinion torque alone 22 inch lbs- with carrier installed, caps torqued, correct backlash. I think I may be a bit on the tight side. The dana doesn't have a removable pumpkin like ford 9in's and toyota's do. 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. Make Your Own Differential Bearing Preload Wrench For Adjusting Backlash on a Chrysler 8.25 9.25 . How Measured: Not possible to measure directly. adding between .003 and .008 to the shim set … Step:19. Set of Duplex bearing mounting with beforehand measured dimension of shaft and bearing housings and internal clearance of bearings. While holding the races on the bearings, and with outer shims on the races, start the carrier into the housing and tap it in with the hammer. Too much bearing preload will kill the bearings almost instantly. What about carrier bearing preload? As I was told constantly when I was a apprentice RTTFM. This will be helpful during the installation process. the only way to determine pinion preload is with the carrier removed so the pinion can rotate freely, so ya might as well do both pinion and carrier bearings … If you read the instructions below, it says to FIRST tighten the carrier caps to 100 ft-lb.and THEN adjust the preload via the threaded adjusters. And others tell me "Run the side adjusters up snug, then after pattern and backlash are set, tighten side adjusters one more hole". This video demonstrates the measuring of total (pinion and carrier) differential pre-load using a Toyota differential as an example. Once backlash and carrier bearing preload is set, then you will want to do a pattern check to see where the tooth contact is, desired is in the middle and lower on the tooth. I have everything setup and have the backlash set to a perfect .008”. The preload for these bearing sets is obtained by multiplying the values listed in the data table by a factor listed in table 1. 4). I'm using a Ratech solid sleeve and stoned burred shims to avoid having … However, this should be avoided as heavier preload substantially increases friction and heat generated by the bearing. Side bearing preload adjustment is crucial to the differential's operation. Ill give it a crack and see how it goes. ASSEMBLY. Install the carrier into the housing and hold it in position with one hand and use the other hand to slide the preload shims into the housing between the carrier bearings and the case. adding between .003 and .008 to the shim set (equally to each side) AFTER setting the backlash will preload the carrier bearings. 3. Also controls how tightly the carrier is held in the housing. Diff rebuild - how to check tooth contact Ep.4 #1026. 2. Set the J 8001-3 so that the stem is aligned with the gear rotation and perpendicular to the tooth angle. I set pinion bearing preload at 12 in.lbs What's the Ideal side bearing preload in in.lbs. Some rear ends use adjusters that are located next to the differential carrier bearings, and others are adjusted by adding/removing shims. 1.) Tighten the pinion nut to approximately 250 foot pounds. Double direction bearings The concept of setting gear back lash to .002-.006 is pretty straight forward, with tightening / slackening the carrier bearing retaining cups equal amount to move the ring gear the desired direction. 5. I set carrier bearing preload by using twice the suggested pinion preload with carrier installed. One method is to set plain half adjuster ( the adjuster on the opposite side of the carrier to the ring gear) so it is one thread out then move the flange half adjuster till you have 0 backlash then go back additional 1 or 2 notches ( I think from memory) then you adjust the plain adjuster up till the bearing cup just starts to rotate then keep going a additional 2 … These bearings can be set manually, supplied as pre-set assemblies, or set by automated techniques. .006" to .010" 75 ft-lbs. If your total preload is 32 in/lbs - pinion preload of 25 in/lbs = 7 in/lbs x ratio of 3.73 = 26.11 in/lbs side bearing preload. Carrier bearing preload ± The preload applied to the carrier bearings when installed in the axle housing. Bearing sets with a heavier preload provide an even higher degree of stiffness. Rear Axle Breather Vent 1975-12 Ford Full-Size Van Rear Wheel Bearings 1973-79 F100 F150 F250 1978-79 Bronco Rear Wheel Bearings 1973-91 Chevy Blazer, Suburban 1973-91 GMC Jimmy, Suburban. Putting an ARB in the rear zuk diff. 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. What's the preferred method for setting the carrier bearing preload. Mark both bearing caps t o ensure proper reassembly. So I added about .005" per side and put it together this time I … See all 64 photos Torqueing the carrier bearing … For a better experience, please enable JavaScript in your browser before proceeding. But plugging those numbers into my equation using a 4.33 gear I only come up with an additional 2.3-3.4 in/lbs drag on the pinion. 5.13’s, HP44, Detroit's, … To set pinion bearing preload, use a holding tool to keep the pinion gear stationary. In order to eliminate the radial and axial play in the bearing which would be inherently present even after a bearing is mounted radially on a shaft. Side bearing adjustment video. Use the original shims on the first assembly or add 0.003” to the original preload shims to make up for the bearings settling into the housing. Then a breaker bar or torque wrench can be used to tighten the pinion nut. Pinion depth is controlled by shims. It is 20 inch pounds higher than the pinion preload (which is about 10-12 inch pounds) for new bearings. At that point I needed a small prybar to remove the carrier. Install the ring gear and carrier bearings on the center section. 63 ft-lbs. I've done quite a few air lockers at work, first couple I checked and did with all the proper guages until I worked out a reliable method which is quite similar to above. or is there a measurement for total assembly rotation, including ring and pinion? Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! I was starting from scratch, so I carefully increased the shim packs until I got it tight and put the backlash where I wanted it (about .008"). This creates a line of contact between t… A position preloading is done by fixing axially opposite bearings in such a way that their internal clearance is minimized by imposing preload. I was starting from scratch, so I carefully increased the shim packs until I got it tight and put the backlash where I wanted it (about .008"). to the thickness of each shim to each side to get your preload. Inadequate carrier bearing preload allows the carrier to move when under load and this can cause the backlash to open up. The Toyota factory method for carrier bearing preload is measured at the pinion nut, just like the pinion preload. 3 #1025. This measurement is recorded in … 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. They should be tight, but not so tight that they don’t slide in. 8 to 11 in-lbs. Accurately measuring pinion bearing preload is easy, use an in/lb torque wrench. measure the torque to rotate the pinion and it should be 7- 11 inch lbs higher (29-33). Pre-set bearing assemblies are available in a variety of forms, styles and arrangements, but for the most part are typically referred to as spacer bearings (Fig. 7. It is difficult to damage bearings with excessive carrier bearing preload on a screw-adjusted differential. If preload is too loose you will be more likely to spin bearings and/or break gear teeth. Bearing sets consisting of three or four bearings have a heavier preload than sets with two bearings. Set the carrier bearing preload to approximately 150 to 200 pounds/feet. Remove the carrier, measure all of your shims for a total and repeat the center section install to verify that you have the correct bearing preload and the carrier rotation feels smooth. If you search this site, there are a lot of gear set up threads that should help explain what you want to know. And others tell me "Run the side adjusters up snug, then after pattern and backlash are set, tighten side adjusters one more hole". A forum community dedicated to hot rod owners and enthusiasts. First you measure the pinion preload and write it down. 80 ft-lbs. If adjusted too tightly, they'll overheat and turn blue, similar to suffering a lack of lubrication. Carrier Bearing Preload. NAXJA Member #929 : Join Date: May 2003. Install Carrier and Adjust Carrier Preload and Backlash Carrier bearing preload is not specifically measured, but a good tight fit is important in all differential designs. Side bearing preload adjustment is crucial to the differential's operation. So that is that, just waiting for my carrier set-up bearings to come in the mail and I will finish. I read one article that said you need a certain amount of shims ( .484 or .170 ) depending on rear and some just say you need SOME preload. CASE BEARING PRELOAD.- The case bearing preload is the amount of force pushing the differential case bearings together. DaffyXJ. If this adjustment is too loose, the differential case will move in the carrier, resulting in damage to internal components like the ring and pinion gear. Make note of the position and thickness of the original shims. EFI, OBDII, 5.0, C4, AtlasII 3.8. How do you know how tight to set a Dana 44 carrier in the housing and how much preload is on your carrier bearings? While holding the drive pinion stationary, move the ring gear back and forth. Posts: 1,030 Re: D44 - how to set carrier bearing preload? I am rebuilding the 3rd member on my Ford 9”. Adding.030" after setting backlash does not mean the bearing preload is correct. I'd like to hear what you guys are doing. But that's how you set carrier bearing preload, on a hotchkiss diff. At Randy’s, our service shop uses a 1/2” breaker bar, as shown in illustration 1A. Thanks MDMIKE for saying "I set carrier bearing preload by using twice the suggested pinion preload with carrier installed" which I take to mean that you expect to see twice the 14-19 in-lbs torque at the pinion once the carrier is properly preloaded. I think I may be a bit on the tight side. I can't remember what the exact thickness is for the GM diffs I have done, or if it's the same for all hotchkiss style differentials. Finding the proper backlash setting can be found in a service manual for the vehicle you are working on. Rather than trying to change the … If you have to beat them in (with or with out a … How do you set carrier bearing preload? Preload for the carrier bearings ensures longer life to them. At that point I needed a small prybar to remove the carrier. Ok so the tirque is overly important be be spot on. 10 to 20 in-lbs. Initially set the backlash with very little carrier bearing preload. A differential with 100,000 miles will have somewhat loose carrier bearings … 3.) For a new pinion bearing I'm aiming for 20-25 in/lbs preload for the pinion alone. Location: southern MD . All GM 10- and 12-bolt housings use an outside shim design for the carrier bearings. This method is based on the principle that rolling torque required to rotate a bearing is proportional to its preload. MIke #8 June 15th, 2004, 19:44 DaffyXJ. The reason we do this is because as you … Carrier bearing preload is important for a strong setup. 74 (14 used & new offers) Shankly 5 Ton Capacity Bearing Pullers, Bearing Puller Set … Folks, I need some help with carrier bearing preload. Too much bearing preload will kill the bearings almost instantly. i.e. The only concern I have is with the carrier bearing shims and preload. The carrier bearings need to have 10-15 in/lbs preload. General Discussion Only, Not for Technical, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Slide the shim pack over the pinion shaft to the shelf. 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. once your backlash is set, add x amount of shims to have to lightly tap it into place. measure the torque to rotate the pinion and it should be 7- 11 inch lbs higher (29-33). Set of Duplex bearing mounting with beforehand measured dimension of shaft and bearing housings and internal clearance of bearings. The majority of pre-set bearings are manufactured and supplied with spacer rings “custom-fitted” between the bearing … My backlash is 0.009 inch to 0.010 inch using new Tom's US Gears, which recommends 0.010 for street applications. There has to be another way. Two - carrier bearing preload isn't normally a set value, it's enough shims to have to slightly force the carrier back into the housing. If you rermove .010" from the left side. Too little preload will cause the carrier to move back and forth. After you install the carrier, you measure it again and set the carrier preload so the total is 20 inch pounds + the carrier preload … If the preload is close and the backlash is too loose, tighten the left adjuster a notch or two until the backlash is correct and the preload is sufficient. Diff rebuild - how to check tooth contact Ep.4 #1026. As with pinion bearing preload, it is critical. In either case removing a shim will Move the pinion away from the center line of the … 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. I am reusing the ring and pinion gears from my old setup and am replacing everything else, including the blown up posi unit with a Detroit Locker. Align the needle and the dial face of the J 8001-3 to ZERO. On models with shims, carrier bearing preload is increased by adding overall shim thickness. If the rotating torque measurement is above 5.1 Y (45 lb in) for used bearings, or 6.2 Y (55 lb in) for new bearings, adjust the differential side bearing preload using the following steps: Place an alignment mark between the differential adjuster nut sleeve and the differential carrier case, left and right sides. Well then, before putting it back in now is a good time to crank those carrier bearing adjuster rings as tight as you can. The number is the mean preload value of the set expressed in daN. Carrier Bearing Preload = (total preload - pinion bearing preload) x the differential ratio. While mocking the rear together several times, each time I've added to each shimpack on each side to get my backlash back to .008. I'm confused since DaffyXJ seems to think that torque will not change. Too little preload will cause the carrier to move back and forth. Paint a contact solution or prussion blue on the face of the teeth, apply resistance on the ring gear and rotate the pinion gear until you have completed one full revolution of the ring gear in both directions (drive and … Diff rebuild - how to set pinion bearing preload Ep.1 #1023. That pretty much seals the deal and makes me feel a lot better about how tight this all is. 7 to 9 in-lbs. Everyone is pretty much in the same ball park. You set your backlash with no preload on the carrier bearings, Then you add something like 25thou. Installed, the pinion nut will require between … It does not matter where the shims are placed but, install the … On models with adjuster nuts, carrier bearing preload is increased by tightening the adjusters. Bearing setting. Is it how hard you have to push the shims in? Did a bunch of reading and ordered the the Richmond gear DVD. Go slowly so as to not damage the bearing if the preload shim stack is not thick enough. JavaScript is disabled. Install carrier shims until there is almost no side to side movement of the carrier. ie: pinion torque alone 22 inch lbs- with carrier installed, caps torqued, correct backlash. In cases where an extremely high degree of stiffness is required, the frictional behaviour as a function of increasing preload can be estimated using the simulation tool SKF Spindle … I set carrier bearing preload by using twice the suggested pinion preload with carrier installed. 2.) Carrier-bearing Preload Definition: See pinion-bearing preload Think of it as: How tightly the carrier-bearings are pressed into their races and consequently how stiff they are to rotate. The carrier bearings need to have 10-15 in/lbs preload. Diff rebuild - how to set pinion bearing preload Ep.1 #1023. Adding .030" after setting backlash does not mean the bearing preload is correct. These are needed if your bearing goes bad and spins inside of this case, damaging the bearing pocket. A proper size spacer is used to obtain the required spacing and preload. Just got all the parts to put my 12 bolt rear back together. I am currently measuring it to be (24 in-lbs - 21 in-lbs) x 3.73 = 11.2 inch-pounds. If this adjustment is too loose, the differential case will move in the carrier, resulting in damage to internal components like the ring and pinion gear. I like to set the carrier bearing preload as tight as I can with a 10 or 12 inch long spanner wrench. But plugging those numbers into my equation using a 4.33 gear I only come up with an additional 2.3-3.4 in/lbs drag on the pinion. 8. On vehicles where the wheel bearing is pressed into a cavity within the steering knuckle, the steering knuckle must be removed from the vehicle in order to press out the old bearing and press in the new bearing. .005" to .007" 103 ft-lbs. After the backlash has been set, add equal shims to both sides until the preload is as tight as possible without damaging the shims. not sayings its spot on but ive never had a drama. with the unit totally assembled) minus the pinion bearing preload (with only the pinion assembly) multiplied by the gear ratio = side bearing preload. The term “setting” indicates a specific amount of end play (axial clearance) or preload in a bearing. 4.) Can there be too much preload… to 2-3/8 in. adding between .003 and .008 to the shim set (equally to each side) AFTER setting the backlash will preload the carrier bearings. Do you measure total rotating torque less the pinion torque? Typical application of such preloading is in Machine Tool spindles due to high rigidity, running accuracy and high speed. Insufficient carrier bearing preload allows the carrier to move when under load; this can cause the backlash to open up. June 15th, 2004, 19:44. The carrier should be shimmed tight enough that it must be tapped in with a plastic dead-blow hammer. So I put one more .010" shim on, to reduce preload, and then torqued the nut, in 3 stages, 100 ft lbs, 200, and then 250, checking preload each time, and my final preload w/setup bearings was 15 in lbs. To facilitate bearing settings of this type of design, pre-set bearing assemblies are frequently used. If you're light, they might last a few thousand miles less then tighter set bearings. The bearings can be set at the time of machine assembly, allowing wider shaft and housing tolerances; The setting of tapered roller bearings can be readily accomplished by a wide variety of viable methods. Of long as there is a bit if preloaded and not to much it should be ok imo. Set the assembled center section assembly into the differential housing with no pinion gear installed in the housing. 10 to 20 in-lbs. Almost everything seems really clear EXCEPT how to preload the carrier bearings. JavaScript is disabled. Everyone is pretty much in the same ball park. It is very important to obtain good preload to avoid damage to your differential. Been researching on how to set preload of the side carrier bearings and set backlash. Torque-Set. 3 #1025. Patrol 4x4 is the best Nissan Patrol forum to discuss the SUV’s specs, parts, accessories, reviews, problems and more. Adjusted Via: Turning the adjuster nuts That would be about as hard as you can with a 12" long wrench. 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. I have never encountered carrier bearing failure due to excessive carrier bearing preload on a screw adjuster type differential." 6.) Yes there is an easy way to tell if you have the proper preload on the side bearings. All radial ball bearingsthat require a preload must be loaded axially. The only concern I have is with the carrier bearing shims and preload. I mark thecarrier bearing nuts before i dissasembled them but when i do them back upto the marks they feel loose, What does the Nissan Manuel say as there a few different ways to go about this depending on manufacture. What's the preferred method for setting the carrier bearing preload. http://www.streetrodstuff.com/Articles/Drivetrain/Rear_End/, VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. West Coast notes that carrier bearing preload is not specifically measured, but a good, tight fit is important in all differential designs. Jeep Dana 30 Carrier Preload…
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