REAL TIME HELP : rear axle bearings

barCruiser · 08-05-08, 10:14 PM

Ok, so I'm finishing up the rear axle pm and trying to set the rear axle bearing preload. I torqued the locknut to 43 ft-lbs (twice, rotating in between), per the FSM. Then even without loosening the locknut the preload it too light (the force required to rotate the wheel is less than what is listed in the FSM). Per the FSM the force required to rotate the wheel should be between 5.3-12.4 lbsf. It is only taking about 3 lbsf to rotate the wheel. Is this an indication that the rear wheel bearings are worn and need to be replaced, or should I just keep tightening the locknut to achieve the proper bearing preload (this would require tightening the locknut more than 43 ft-lbs). Any help is greatly appriceated.

Beowulf · 08-05-08, 11:33 PM

Hmmm. Something doesn't seem right to me. The procedure is to snug up the hub nice and tight (43 ft/lbs) to squeeze the grease and to seat the bearings. I would keep doing this until the hub tightens more than the 12.4 lbs, then back off and set the preload per the specs, then secure the lock nut with the 2 screws.

-B-

Slomo · 08-05-08, 11:56 PM

IIRC when I did mine I had to torque to 43 lbft then spin the hub which would loosen everything like Beowulf said. After doing this a few times (basically repeat the initial procedure a couple of times) I wound up at 11 lbs. Hope it helps and good luck.

-Spike- · 08-06-08, 12:06 AM

Is this the inner nut you're tightening to 43 ftlbs, or the outer (lock nut)? The inner, by itself, should be tightened to 43, at which point you should have difficulty moving the hub at all. If that's not happening, I'd take the bearings back off and see what's going on- you may have something wrong that's allowing the adjusting nut to bottom out somehow.

-Spike

Beowulf · 08-06-08, 12:14 AM

He is doing the rear Spike, there is only the 1 hub nut that is locked with 2 screws instead of an outer lock nut like the front.

(Pics from beno's rear axle service thread in the FAQ)

When you are doing the rear you torque to 43 (or whatever is in the FSM) then set preload by aligning that lock nut to the indents on the spindle, then lock down the nut with the 2 screws.

-B-

IdahoDoug · 08-06-08, 12:15 AM

Agree with Spike's question. Also, your use of "to rotate the wheel" gives me the impression you are not using a string scale on the hub stud?

DougM

-Spike- · 08-06-08, 12:26 AM

Quote:

Originally Posted by Beowulf

He is doing the rear Spike, there is only the 1 hub nut that is locked with 2 screws instead of an outer lock nut like the front.
When you are doing the rear you torque to 43 (or whatever is in the FSM) then set preload by aligning that lock nut to the indents on the spindle, then lock down the nut with the 2 screws.

-B-

Wow, been awhile since I did the rear. You sure there's no inner/outer? I guess I vaguely remember something like you describe. In any case, I'd still guess something's bottoming out where it shouldn't. Maybe one of those locking screw-things?

-Spike

Beowulf · 08-06-08, 12:41 AM

Here is an image of the rear axle components. I could not find it in the FAQ or in Onur's rear axle service thread.

-B-

Beowulf · 08-06-08, 12:47 AM

This may be the part that barCruiser is missing:

Using a spring tension gauge, check the preload and
tighten the nut until the preload is within the specification.
Preload (at starting):
26–57 N (2.6–5.8 kgf, 5.7–12.8 lbf)

After the 2nd torque to 43, you loosen to hand tight, then continue to tighten until your preload is within the above range. You don't leave it at 43 and you don't leave it hand tight.

HTH.

-B-

turbocruiser · 08-06-08, 01:06 AM

Fellas this is exactly the thing that I verified and re-verified in the following thread. You can see that it got a great many responses which is why it was so memorable methinks

but anyway ...

http://forum.ih8mud.com/80-series-te...lock-nuts.html

I found this out by following the FSM precisely over and over and over and realized that to take that locknut to the proper position yer gonna get anywhere from 43 to 48 ftlbs of torque! I suspect everyone with the right rear preload could put one of those old fashioned torque twist things on the nut and measure 43 to 48 ftlbs before it busts loose.

barCruiser · 08-06-08, 06:28 AM

Thanks turbocruiser, that post pretty much answered my question. I'm going to work on it tonight, and will probably just use more torque on the preload, and see where that gets me. Can't wait to patch this up and try out my new 4.88's.

08-05-08, 10:14 PM	#1
barCruiser IH8MUD Junior Join Date: Jan 2008 Location: Atlanta, GA Posts: 139	REAL TIME HELP : rear axle bearings Ok, so I'm finishing up the rear axle pm and trying to set the rear axle bearing preload. I torqued the locknut to 43 ft-lbs (twice, rotating in between), per the FSM. Then even without loosening the locknut the preload it too light (the force required to rotate the wheel is less than what is listed in the FSM). Per the FSM the force required to rotate the wheel should be between 5.3-12.4 lbsf. It is only taking about 3 lbsf to rotate the wheel. Is this an indication that the rear wheel bearings are worn and need to be replaced, or should I just keep tightening the locknut to achieve the proper bearing preload (this would require tightening the locknut more than 43 ft-lbs). Any help is greatly appriceated. __________________ 1996 LX450, factory lockers, slee 4", 4.88, 315's, new HG, 140k, HIR w/ harness, CDL 1979 Jeep CJ7, 3" lift, 33" BFG m/t, sbc 350, front/rear lockers

08-05-08, 11:33 PM	#2
Beowulf The quick brown fox ..... Join Date: Mar 2003 Location: Somewhere in the foothills... Posts: 10,566	Hmmm. Something doesn't seem right to me. The procedure is to snug up the hub nice and tight (43 ft/lbs) to squeeze the grease and to seat the bearings. I would keep doing this until the hub tightens more than the 12.4 lbs, then back off and set the preload per the specs, then secure the lock nut with the 2 screws. -B- __________________ 97 FZJ80 - Wing Nut MAF, locked, 315 Toyos, 4.88s, Slee 4", George's sliders, Slee bumpers, M12000, OBA, Outback drawers + other stuff. Transformation in progress... Sometimes you find yourself in the middle of nowhere. And sometimes in the middle of nowhere, you find yourself.

08-05-08, 11:56 PM	#3
Slomo IH8MUD Lifer Join Date: Feb 2006 Location: Inside the Orange Curtain TLCA# 15819 Posts: 2,696	IIRC when I did mine I had to torque to 43 lbft then spin the hub which would loosen everything like Beowulf said. After doing this a few times (basically repeat the initial procedure a couple of times) I wound up at 11 lbs. Hope it helps and good luck. __________________ Mo 97 FZJ, Tillie dog, locked, 6" Slee'd, Hanna'd, Mo'd, Bilstiens, upper/lower arms, DBAs, Mojave's w/ 315s, ARB w/ winch, synthetics, flareless, Extreme aire, XM, CB, 2 meter, George's LEDs,Optima, other crap, work in progress. "Congressmen who willfully take actions during wartime that damage morale and undermine the military are saboteurs and should be arrested, exiled, or hanged. " Abraham Lincoln 1863 www.4x4upgrades.com ___________________________________www.esmetalman.com

08-06-08, 12:06 AM	#4
-Spike- IH8MUD Lifer Join Date: May 2005 Location: Phoenix Posts: 3,471	Is this the inner nut you're tightening to 43 ftlbs, or the outer (lock nut)? The inner, by itself, should be tightened to 43, at which point you should have difficulty moving the hub at all. If that's not happening, I'd take the bearings back off and see what's going on- you may have something wrong that's allowing the adjusting nut to bottom out somehow. -Spike __________________ His 1994 TLC 'White Elephant' +6"/35" Locked and loaded. Hers '95 TLC Bare bones. "I don't understand this business of illegal aliens giving birth to American citizens. If your cat has kittens in the oven, would you call them biscuits?" -Unknown

08-06-08, 12:14 AM	#5
Beowulf The quick brown fox ..... Join Date: Mar 2003 Location: Somewhere in the foothills... Posts: 10,566	He is doing the rear Spike, there is only the 1 hub nut that is locked with 2 screws instead of an outer lock nut like the front. (Pics from beno's rear axle service thread in the FAQ) When you are doing the rear you torque to 43 (or whatever is in the FSM) then set preload by aligning that lock nut to the indents on the spindle, then lock down the nut with the 2 screws. -B- __________________ 97 FZJ80 - Wing Nut MAF, locked, 315 Toyos, 4.88s, Slee 4", George's sliders, Slee bumpers, M12000, OBA, Outback drawers + other stuff. Transformation in progress... Sometimes you find yourself in the middle of nowhere. And sometimes in the middle of nowhere, you find yourself. Last edited by Beowulf; 08-06-08 at 12:28 AM.

08-06-08, 12:15 AM	#6
IdahoDoug IH8MUD Lifer Join Date: Aug 2003 Posts: 6,548	Agree with Spike's question. Also, your use of "to rotate the wheel" gives me the impression you are not using a string scale on the hub stud? DougM __________________ Buy Head Gasket DVD for you OR for your mechanic HERE '93 FZJ since new, 2.2kw starter, Revo 275s, locked, big Hellas, rr fog, rr flood, rr Airlift, synthetics, ARB bullbar. 97 FZJ - exact same stuff but Michelin Alpins in winter "Slicker than owl shit on a wet log." - Carter

08-06-08, 12:41 AM	#8
Beowulf The quick brown fox ..... Join Date: Mar 2003 Location: Somewhere in the foothills... Posts: 10,566	Here is an image of the rear axle components. I could not find it in the FAQ or in Onur's rear axle service thread. -B- Attached Images __________________ 97 FZJ80 - Wing Nut MAF, locked, 315 Toyos, 4.88s, Slee 4", George's sliders, Slee bumpers, M12000, OBA, Outback drawers + other stuff. Transformation in progress... Sometimes you find yourself in the middle of nowhere. And sometimes in the middle of nowhere, you find yourself.

08-06-08, 12:47 AM	#9
Beowulf The quick brown fox ..... Join Date: Mar 2003 Location: Somewhere in the foothills... Posts: 10,566	This may be the part that barCruiser is missing: Using a spring tension gauge, check the preload and tighten the nut until the preload is within the specification. Preload (at starting): 26–57 N (2.6–5.8 kgf, 5.7–12.8 lbf) After the 2nd torque to 43, you loosen to hand tight, then continue to tighten until your preload is within the above range. You don't leave it at 43 and you don't leave it hand tight. HTH. -B- __________________ 97 FZJ80 - Wing Nut MAF, locked, 315 Toyos, 4.88s, Slee 4", George's sliders, Slee bumpers, M12000, OBA, Outback drawers + other stuff. Transformation in progress... Sometimes you find yourself in the middle of nowhere. And sometimes in the middle of nowhere, you find yourself.

08-06-08, 01:06 AM	#10
turbocruiser IH8MUD Lifer Join Date: Dec 2003 Posts: 3,085	Fellas this is exactly the thing that I verified and re-verified in the following thread. You can see that it got a great many responses which is why it was so memorable methinks but anyway ... http://forum.ih8mud.com/80-series-te...lock-nuts.html I found this out by following the FSM precisely over and over and over and realized that to take that locknut to the proper position yer gonna get anywhere from 43 to 48 ftlbs of torque! I suspect everyone with the right rear preload could put one of those old fashioned torque twist things on the nut and measure 43 to 48 ftlbs before it busts loose. __________________ 97 FZJ80, Locked & Loaded, Safari Turbo, Safari Intercooler, LandTank MAF, 3" Ceramic Coated Custom Exhaust, Ron Davis Racing Radiator, OME HD 2.5" Suspension, DBA Slotted Rotors, New Toyota Calipers All Around, Toyota Pads, 33" Revos, ARB Front Bumper, Center Diff Switch, Slee Stuff: Roof Rack, Step Sliders, Skid Plates, SS Brake Lines, DC Drive Shaft. HG PM'd, 8.5psi and climbing, My Rocky Mountain Mojo Mobile!

08-06-08, 06:28 AM	#11
barCruiser IH8MUD Junior Join Date: Jan 2008 Location: Atlanta, GA Posts: 139	Thanks turbocruiser, that post pretty much answered my question. I'm going to work on it tonight, and will probably just use more torque on the preload, and see where that gets me. Can't wait to patch this up and try out my new 4.88's. __________________ 1996 LX450, factory lockers, slee 4", 4.88, 315's, new HG, 140k, HIR w/ harness, CDL 1979 Jeep CJ7, 3" lift, 33" BFG m/t, sbc 350, front/rear lockers

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