OK, so I tightened thee pinion nut to about 130lbs and it made the problem about 70% better. The pinion nut backed off a half turn, should still be tight enough on the pinion shaft threads to use the torque wrench to test the drag. I put a impact on it but don't wanna keep hammering on it. Find someone with an inch pound dial torque wrench. crush collar o r pinion nut). Tight is good as it will locate best and stop the bearing from fretting on the shaft. Is it likely in the bearing? There is some play in and out on the yoke. Didn't know that it was set up without a crush sleeve at all, never heard of that before. The pinion nut does not have a torque spec. A piece of "pipe" that is used to hold the pinion bearings apart and offer some resistance for the pinion nut. The 7 mm nut must be removed while the spur gear’s retaining screws are attached or the spur gear will just spin as you try to grip it to remove the 7 mm nut. It wants to have just a little bit of drag on the pinion bearings when the nut is really really tight. If you are using your old bearings the torque spec. You will need a "torque to rotate" torque wrench. One of the following methods should work for you. You need to snug it up tight then use an inch/lb torque wrench to see how much torque (in inch pounds) it takes to rotate the differential. Keep cranking the nut splitter screw until the nut makes an audible pop and you get through the nut. Your manual should have that spec. tighten the nut down till its snug and put on your torque wrench and turn it about 3 revolutions. Have a aam11.5 rear end put 4.56 gear in it the drive is quiet and so is the coast until it get around 65 down to 55 it whines but no noise after that.its a yukon gear i thought it might be a loose pinion nut but preload is correct ant nut hasn’t backed off. I don't mark the nut when I replace the seal. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. im wondering i just keep going or what? I suspect you now have some bad pinion bearings and maybe a a bad ring & pinion to boot. Rotate the pinion when tightening the nut to seat the bearings evenly. Now the vibration doesn't start till about 60mph and it isn't as severe. Use oil on the pinion nut washer surface during all assemblies and red loctite on the pinion nut threads during the final assembly. I kept going all the way up to 175 ft lbs, and I still have below 10 in lbs. I guess if it had not been for interference with the u joint it would have come completely off. Get an old pinion nut and either cut the locking part off , or grind it out. It requires approximately 180ft./lb of torque to begin to crush the collar. sounds like it may be rubbing on the differential assembly. The amount of torque is measured in bearing preload. No, the crush sleeve, bearing inner races, and pinion gear all rotate as one unit. is 15-25 in. Joined: Oct 30, 2008 Posts: 3,288 Likes Received: 654 Usually when the nut is loose, that means the ends of the crush sleeve have worn down some. The reading in inch lbs has not really changed with all the torqing. John S Well-Known Member. You can adjust or set the pinion bearing preload by turning the pinion nut to tighten or shorten the spacer. I always use some red Lock Tight on the threads when I put the nut on. If you are using new bearings the torque spec. If the pinion flange nut is too tight there will be too much or too little preload on the bearings causing noise and accelerated wear. The pinion nut had backed off. usually a 10-25 inch pounds (INCH!) lbs to rotate. for a ten bolt rear it should be about 20 inch pounds while you are turning the torque wrench. Do not over tighten the pinion’s set screw. I got a 04 rhino 660 and I'm putting new seals in the rear end due to pinion seal leaking. A 94 doesn't have rack and pinion. I have just replaced the pinion seal on my 2003 Ram 1500, when I had got the prop bolts out my friend decided to undo the pinion nut before I had a chance to check the pre load. is 10-20 in. lbs. im sure somebody else who knows more will speak up and give you some advice. Set the preload carefully (see “Specifications”) so that the bearings will have a long life. is 15-25 in. Setting the Pinion Bearing Preload Minus a Torque Wrench. It was below 10 in lbs. d. Torque the pinion nut to the crush collar and establish the correct pinion preload. The pinion nut does not have a torque spec. to turn. m (160 ft. You don't have a torque spec for the pinion nut? Continue tightening the pinion nut to collapse the spacer and preload the bearings. Pinion Nut too tight? I remembered that a couple of years ago when I replaced the pinion yoke that I did not use lock tight on the threads. is 10-20 in. The pinion nut must be tightened down, crushing the crush sleeve, until proper pinion preload adjustment is achieved. If you are using your old bearings the torque spec. Before we talk about installing pinion flange, it’s important to mention some tricks for removing the pinion flange: Pinion Flange Removal. as in how tight the nut is. Replacing the Spur Gear The first step in removing the spur gear is to remove the 7 mm nut that holds the slipper adjustment spring in place. When you tighten the nut really tight (as it's supposed to be), then the bearings will have too much drag on them, and run hot. I installed new gears with the old shims and my pinion barely moves it is so tight. It would be very hard to over tighten the nut to get 2 extra threads to show. (The rest of this procedure is what is not in the Tereflex instructions.) Then take out your pinion bearings and if left could destroy the whole rearend the gears bind up and could explode chip or jam up metal every where. lbs to rotate. With one hand, reach around into the differential housing, and hold the pinion. lbs. Tried loosening but the nut just gets loose. rolling resistance of the pinion bearings after proper torque has been applied to the pinion nut. it is very hard to tighten and there is still too much play. but since it was loose i would be concerned about any kind of damage that could have happened inside the differential. How does one reinstall and tighten the pinion nut on a 12 bolt rear after replacing the pinion seal? If you use a solid spacer make sure your nut locks in place maybe a little blue loc tight. Rear picked up a howl and vibration at 45mph. This time I did. if its too tight when pinion nut is tightened it needs a thicker shims between pinion bearings or spacer is missing from behind flange, once a nut is tight extra torque makes very little difference jamesmartin, Jan 8, 2016 #3. The short answer is yes, you can, and there are a few ways you can manage this task. That is just a thought. I'm guessing that the pinion nut was backed off a little to begin with, and may have been part of the reason that the seal was leaking. If the preload, etc, is done correctly they're a trouble free rear end. The nut could have been left a little loose and then you tightened it up and took out the slack. A nut splitter is slipped over the seized nut, then a screw on the side of the splitter is tightened which forced a wedge into the side of the nut. The easiest way is with an impact wrench. It takes about 300 foot pounds of torque on the pinion nut to crush the spacer, so if you go back with about 100 foot pounds you should be safe. Do I have to … It had thread lock on the pinion nut to keep it tight. Use it for setup and pulling the outer bearing on. As the pinion nut is tightened it forces the yoke against a "crush sleeve" (red) that is designed to "control" collapse under force. And, even though the differential and ring gear are still in place, the difference in pinion bearing drag should be seen easily. Normal or desirable pattern: The drive pattern should be centered on the tooth. You will need a "torque to rotate" torque wrench. I did index it with a chisel mark and a coresponding one on the flange but have no idea how tight it should be. I got all the seals installed with some sealant around the pinion nut but my question is how tight should the nut be? if it is under twents hold the yoke with a pipe wrench and tighten just a little at at time till the torque wrench reads a constant 20 inch pounds for the revolutions. Should I tighten more or loosen it up. lbs.). Back off the nut splitter screw and clean the bolt of the split nut. The castle nut will be loose but is held in place by the cotter pin. If the preload changes, it would be due to either the nut backing off (that's why it should be staked) or there's pinion … or a rolling torque should do it. i was told 160-200ft lbs of toque on the pinion nut. 7. The drive axle nut at the hub, torque spec is 180 ft lbs. im rebuilding the differential on my 95 chevy truck im not sure how tight to make the pinion nut i know the new bearings get set to 25 inch lbs but not sure how tight to tighten the nut with the new crush sleeve intalled? The amount of torque is measured in bearing preload. The rotating torque must be 2 to 3 N-m (15 - 25 inch pounds). What should be the next step to go after the remainder of the problem? About 1/16 to 1/8 of an inc. If you are using new bearings the torque spec. I await your results. It couild be that someone has been in this one before and the spacer might have already been crushed more than it should have. I know that when the pinion gear is first installed - the pinion nut should be tightened until the pinion requires approximately 25 in./lbs. They go anywhere from sliding on to a tight fit. If the pinion nut had been left loose when you picked up the car you would have noticed it right away. I'm not doubting that it is too tight now, but it was probably too loose to begin with. I torked the pinion nut to 140 ft lbs and made my first pre-load measurement. When a very slight increase in pinion turning effort is noted, check the pinion rotating torque using an inch-pound torque wrench. Then, using quick bursts, tighten the nut to just under the specification. The installer should have used a new nut, it is fround upon to re-use a pinion nut, at least it used to be. Not enough force from the pinion nut and the crush sleeve holds the pinion bearings too far away from the pinion race resulting in not enough pinion pre-load. jeff: how tight should the pinion shaft nut be on a 580b with differential lock: Paul: If the pinion shaft your refering to is the transmission countershaft with the 5 gears on it and 2 tappered roller bearings on each end, then you need to set the preload on those bearings with the nut on the end of that shaft. as in how tight the nut is. New pinion bearings and crush sleeve and $120 later its ready for another try. How tight should the rear axle bearing be on a 2001 f 350 - Answered by a verified Ford Mechanic We use cookies to give you the best possible experience on our website.