But secondly, I have torqued the nut up to 50 ft/lbs just to see, and the diff appears locked solid. (d) Using SST, torque the adjusting nut on the ring gear side until the ring gear has a backlash of about 0.2 mm (0.008 in.). In title “Installation and Setting Pinion-bearing Preload” where it says in point 11 by picture ol to hold the yoke, torque pinion nut to 255 ft-lbs. In my opinion crush sleeves shuold not be reused unless you absolutely … Thats what I would do for insurance sake. As I was tearing it back apart, loosening the diff nut would move the pinion nut, tightening that. If it's too tight the bearing will heat up, if it's to lose it will wobble.Ideally the nut should be tightened with no seal in it and out of the carrier, to provide a resistance while turning of 20-25 inch pounds using an inch tork wrench. After the bearings are settled, loosen the adjusting nut on the drive pinion side. Rotate pinion several times to seat pinion bearings. The problem now is how does one set prelod? So I simply used the tool to verify the nut … f. Install the carrier to fit snugly in the ho using and set the backlash to DSSUR[LPDWHO\ ´WR … Lastly if the pinion nut torque required to reach correct preload is less than 180Nm then the crush sleeve should be replaced. Step 11. Never loosen pinion gear nut to decrease pinion gear … Bad sign. Go slowly so as not to damage the bearing if the preload shim stack is not thick enough. Raise the rear of the truck off the jack stands with a jack, remove the … Tightening up the pinion nut clamps all three items together (inner bearing, spacer, outer bearing). The service manual says to never back off on the nut to achieve … If the pinion nut was loose, it may be an indication that you have a bad pinion bearing or 2 in there, hence the leaking seal. The easiest way is with an impact wrench. The TJ D30's might have one. Ramps are probably more stable. Assemble the pinion flange and do up the nut while moving back and forth the pinion flange to allow the bearing rollers to seat properly. This can only be accurately measured without the differential carrier and axles and all that in place. Step 6. If it is a crush sleeve you should really mark the nut's present location, Mark how deep the nut is on the pinion thread and what flat is where and get it back to this location so the torque on the crush sleeve is the same as stock. The first I did had a Nylock nut, but looked good and tight. I can't turn the flange (just to be clear, I mean the pinion shaft flange that … The pinion nut gets torqued to the point where you have proper preload on the pinion bearings. as in how tight the nut is. Take frequent differential pinion bearing preload readings by rotating the pinion with a Nm (inch-pound) torque wrench. Tighten the pinion nut to approximately 250 foot pounds. Messages: 20,334 Likes Received: 1,572. torque wrench. Do not simply hammer the nut on with an impact wrench, as the torque on the nut has a direct effect on pinion-bearing preload”, what tool is the writer referring to? If the preload is too loose then remove shims so that the bearings will be tighter against the races and increase the preload. 4. Use some thread lock on the threads." I would pull the complete pinion carrier (the 5 bolts that are around the seal area) and have someone that knows how to rebuild one of these … Easy job, you should have no problems. Note the amount of pressure required to turn the nut. At this … lbs. Over tightening the pinion nut resulting in too much Pinion pre-load will not only ruin your day, it will ruin your week! is there a specific way to tighten the pinion nut on the rear dirrerential. Tighten the nut with a torque wrench, using the torque reading you took before removing the yoke as your guide. I have a tool that is made to hold the yoke while tightening the nut, but a large pipe wrench will also work. Use an in-lb torque wrench to check the rotational torque needed to rotate the pinion. I'm thinking of making a long wrench using about a 5' length of heavywall square tubing, with two peices of heavy flatbar on the end, welded 90 degrees to the bar and drilled to mate with the yoke strap bolts. If it is 0 or a low inch pounds, the you have to tighten the pinion nut some more and repeat the step until the free turning force is within the preload specs. Try adding more penetrating oil to the newly exposed bolt threads, then … The correct method would depend on the axle, usually you should be replacing a crush sleeve (depends on the axle), the tighten it in increments while checking pinion preload … is reached before torque to rotate is achieved, the collapsible spacer may have been damaged. If you use jackstands you'll need good working parking brakes to hold back your wheels from turning when you tighten the pinion nut. The pinion nut does not have a torque spec. If you tightened the nut too tight, then the bearings that you used has just enough difference in it to allow you to over tighten and bind up the pinion bearing becuase the shims are now incorrect. The preload is achieved by means of a spacer between the two pinion bearings. If pinion nut is overtightened, collapsible spacer on pinion must be replaced. (285 N.m). The photograph below shows the pinion nut has now moved approximately 1/4 inch. Reassembly is … Setting the Pinion Bearing Preload Minus a Torque Wrench. Hold the yoke with a large pipe wrench and then re-align the marks when tightening the nut back down. Text and diagrams refer to companion flange, or pinion nut etc, and on diff reassembly, the text just says tighten the nut securely, no mention of a torque setting. Put gasket sealer on the splines , slide the yoke on and then tighten but use loctite on the nut and then tighten as much as possible. Switch over to the inch-pound torque wrench and turn the pinion nut. Scott Hill TC 2596 ACES 6390 My Showroom 1968 ElCamino my 1st car 1983 H-D Lowrider 2000 H-D Softail 2009 H-D Street Glide 2007 Silverado Oh, the humanity! Reassembly involves tightening the flange nut in steps while measuring the friction torque. If you checked before you movd the nut, there was probably a little up/down side/side play in the yoke. I'd use the large style SUV jackstands under … The turkeys are hitting the … 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. e. Tap on the yoke a few times to ensure that the races are fully seated and recheck your pinion preload tighten the nut to reset the preload to factory specs. lbs to rotate. What are you guys using to hold your pinion yoke when tightening down the pinion nut? The final reading must be 0.56 Nm (5 lb-in) more than the initial reading taken during removal. The nut is tightened until the original value + 20 … I guess it must be some sort of do it yourself tool, but considering … is 10-20 in. Back off the nut splitter screw and clean the bolt of the split nut. Position the u-joint on the drive shaft back in the yoke and install the retaining bolts. Finally decided to actually get around to pulling out the Rear Differential to check on my Pinion Nut and do some Maintenaince for the riding season coming up. it is a 68 elcamino with a 331 12 bolt posi.i'm replacing the leaky seal everything else looks good. If you are using your old bearings the torque spec. Also once you get it where you think it is right, take a rubber mallet and tap both the gear end and the threaded end to set … 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. Tighten in small increments and check torque until you get to 10 in-lbs. If the recorded reading to turn the pinion before removing the flange is higher, then tighten the nut until you obtain that reading again after installing the new flange and seal. That was my initial confusion. Install the pinion nut and tighten it, seating the yoke on the shaft. The amount of torque is measured in bearing preload. Well I can't … I don't remember a crush sleeve in my LP D30 either but there are just soo many variants. With Ford's there is a crushed ring you should use a new one, tight the pinion nut until there is a slight drag. The pinion nut doesn't have a torque spec, it's torqued to proper preload. It threads onto the pinion gear (near the center), holding it in place in the housing and holding the yoke onto the pinion. D51 '78 Scout SSII - 345, 4 … Once the pinion nut is released, the pre-load will disappear so it is important to set it correctly when reassembling. This collapsible space is generally used to get a more precise pressure on the bearing preload. If you tighten the nut too much and end up with a higher in/lb reading, then you need to replace the crush sleeve and start over. Eventually the diff nut locked itself to the pinion nut, so with each turn tightening the diff nut, the pinion nut loosened a turn. BonzoHansen Administrator Lifetime Gold Member. I think you will find that once it's tight the preload will be correct no matter how much you continue to tighten the nut, about 150 ft/pds on the nut would be … Use the old pinion nut to secure the yoke and tighten to obtain the factory specified preload. Use an inch-pound torque wrench to check the preload. Joined: Jun 1, 2005 Location: Scott from Hamilton, … Rotating torque should be equal to reading … If you wanted to be cautious and replace the crush spacer it would require complete disassembly ie: axle's out , carrier out , pinion out. If you are using new bearings the torque spec. is 15-25 in. Here you can see the pinion nut at the upper right. What I normally do is mark the relationship between the pinion nut and the pinion shaft before disassemby, then torque the nut … The advantage to using jackstands is that if you need to rotate the driveshaft to access the drive shaft yoke bolts when removing/installing it, you can. CAUTION: DO NOT overtighten or loosen then retighten pinion nut when adjusting pinion bearing preload. Tighten the nut, rotating the pinion occasionally to ensure the differential pinion bearings are seating correctly. Tighten the nut till it's flush and actually tight on the yoke, check your preload with your torque wrench, keep tightening the pinion nut until you get the correct rotational torque value when you rotate the pinion. If you have good parking brakes that can be used to help hold the pinion while you tighten the nut. If the drag is too low, tighten the pinion nut a small bit, and do the drag test again. The only thing you can do is tighten up the pinion nut pretty tight and hope for the best. Normally when torquing the pinion nut, you tighten the nut until the turning torque (force required to spin the yoke) is about 25 inch pounds. With one hand, reach around into the differential housing, and hold the pinion. Keep cranking the nut splitter screw until the nut makes an audible pop and you get through the nut. while holding the yoke with a pipe wrench. Then, using quick bursts, tighten the nut to just under the specification. (blue and red arrows … If the preload is too tight then remove the pinion … You can do … Tighten the bolts with a wrench. After the pinion yoke is fully seated on the shaft, use a torque wrench to tighten the pinion nut to 200 ft.-lbs. Jul 23, 2014 #12. You tighten the pinion nut down, then measure how much effort it takes to turn the pinion. Marking the nut, measureing the torque when you remove it, doesn't matter, it won't work. I leaned on the breaker bar to achieve another small incremental movement of the pinion nut. The BMW procedure for replacement of the pinion seal calls for determining the preload by measuring the friction torque required to rotate the pinion (ring gear and carrier removed) before removal of the input flange nut. (e) While turning the ring gear, use the SST to fully tighten the adjusting nut on the drive pinion side. I reinstalled the holding tool and socket to the pinion nut. Tighten the nut with the breaker bar and socket to draw the yoke onto the pinion shaft. m (200 ft. Tighten pinion nut to 210 ft. lbs. You can adjust or set the pinion bearing preload by turning the pinion nut to tighten or shorten the spacer. using a suitable torque measuring procedure adjust the pinion nut until that torque setting is reached. It was all over as soon as you loosened up that nut without making a reference mark. The shorter the spacer, the more the bearings are pushed together and … lbs.) You will need a "torque to rotate" torque wrench. Now, I have used my "tool", yup I gave Les a hand in the design, drawings and instructions. All that said, there is a chance you did damage to your differential without realizing it. I'll be using the "no crush sleeve" and old nut method initially, … Rotate pinion using INCH-lb. To measure this you will need to tighten the nut in small … This operation is one of the reasons my inch pound torque wrench doesn't have a hand holder on its pull end, it has a ring, so a finger can be … When you arrive at the scale specification, stop, the pinion nut is tight enough to sustain the correct pinion bearing drag specification. And you use the "tool" to loosen or tighten the pinion nut in accordance with the instructions provided.
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