Setting gears, bearing pre load .. (1 Viewer)

[Tapage]

Reading and reading found this info in the Randy's site .. and just wanna know your opinion about it ..

Randy's Ring & Pinion. Tip of the Day.

this part it's interesting to me ...

If you put a lot of preload on the carrier bearings it also preloads the housing. Since the housing is already flexed, it is not likely to flex even more causing the ring gear to move away from the pinion resulting in broken teeth.

 

[KLF]

Makes sense to me, at least I can't argue with the reasoning. I made a spanner that's about 18" long, I crank it down about as tight as I can get it to pre-load the carrier bearings.

 

[notaf-ingjeep]

I would say those guys know what their talking about. Bearing preload is important to get right, I haven't done a diff, but I did in my t.case. It is pretty simple using a torque wrench, I found it best to use one that doesn't break or "pop". Use one that has the scale on it, you can see where it is pointing as you turn. That way you can see how much constant torque it takes to turn it. I know that too much preload in your diff can break the teeth. I also know that with a Detroit locker the more preload you have, the harder it engages and disengages. As far as the housing being to blame for the breakage, I don't know. Either way your teeth broke because the bearings were under too much load.

Are you planning on installing your own gears? 150-200 ft-lbs is a lot of torque to put down, you will most definitely need a huge breaker bar, like they are suggesting. You will need a torque wrench that is capable of those kind of numbers as well. Like I said I haven't done a differential, I am not a mechanic either. My skills are in fabrication, but I think it is a pretty straight forward process. I was successful setting the preload in my t.case, I think I could do a diff just as well.

 

[Tapage]

I install my both 4.56 in Tencha and one set that I broke in the Wife FZJ80 .. ( BTW used gears sucks to install ! ) but never go that far 200ft/lbs .. that's hi actually IMOP .. that whay I come here to read some other experiences ..

 

[mookie]

I crank it down about as tight as I can get it to pre-load the carrier bearings.

am i the only one who thinks this is a bad idea?

 

[71-CRUISER]

The Toyota FSM says tighten to zero preload then another 1-2 notches to set preload on the carrier bearings.

 

[notaf-ingjeep]

am i the only one who thinks this is a bad idea?

I think that is a horrible idea! The bearing preload is important, and is a job where precision is needed. There is a proper way to do it, it's necessary to do it well. If you just crank the sucker down as tight as you can get it, your asking for disaster. I don't think that really it isn't that hard of a job to do right. If is too much for someone, take it to a mechanic! A good set of ring and pinion gears, are by no means cheap. I think it is way better to pay a mechanic to install them properly than do it wrong and end up destroying them. When you break any of your axle internals it can be catastrophic. Everything can get ruined


I think that Tapage is right 200 ft-lbs seems excessive. But I would think a lot depends on the particular application, and the manufacturer specifications should be used.

 

[Tools R Us]

I agree that "tight" is "right". In talking to Zuk (who's setups are regarded as some of the strongest done locally) his carrier setup is ~75-100 ft-lb on used bearings and/or street driven and 150-200 ft-lb on new bearing trail rigs. This link has some of his thoughts, the home page has tons of installs documented.

carrier bearing pre-load

 

[Tapage]

I agree that "tight" is "right". In talking to Zuk (who's setups are regarded as some of the strongest done locally) his carrier setup is ~75-100 ft-lb on used bearings and/or street driven and 150-200 ft-lb on new bearing trail rigs. This link has some of his thoughts, the home page has tons of installs documented.

carrier bearing pre-load

hey thanks .. great link .. reading right now ..

 

[mookie]

yeah, wow i just read that while ago too....live and learn i guess. i've always just set my backlash then tightened the bearing caps down without torquing the adjusters at all.....so, if i'm to understand this torquing the hell out of the adjusters with make it easier on the r&p but worse on the axle shafts?

 

[Tapage]

I htought there is no point that means worse on the axle shafts .. what I underestand is less preload, more the 3rd = R&P flex .. that is bad ..

Bigger tires are worse on the axle shaft as same as lockers ..

 

[JLHEEPETR]

Yukon's install booklet tends to agree. While it warns of putting to much preload on the pinion bearings (if your shim pack on the solid spacer is too thin or from over doing a crush sleeve) it says it's not a concern to add too much preload on the carrier bearings. Mostly due to thier relatively much larger size. I think it would be hard to damage them unintentionally.

 

[mookie]

but too much preload of the carrier bearings will make your locker engage and disengage harder? thus harder on your axle shafts? true or false?

 

[JLHEEPETR]

I might be mistaken but I don't see how higher carrier bearing preload would affect locker engagement. I think Zuk's point was that a stronger R&P setup would be harder on axles because it would be less of the weak point thus increasing the chance of breaking an axle if something is to go.

 

[mookie]

ok, thanks....def. something to do next time i have one of my axles apart

 

[Tools R Us]

Yukon's install booklet tends to agree. While it warns of putting to much preload on the pinion bearings (if your shim pack on the solid spacer is too thin or from over doing a crush sleeve) it says it's not a concern to add too much preload on the carrier bearings. Mostly due to thier relatively much larger size. I think it would be hard to damage them unintentionally.

Also the pinion turns 4-5 times faster (depending on ratio) this requires less preload. Most have had good results at the high end of spec or slightly higher.

but too much preload of the carrier bearings will make your locker engage and disengage harder? thus harder on your axle shafts? true or false?

I agree that locker setup is independent of carrier bearing setup, so won't have an effect on locker operation. On the axle shaft thing, they don't become any weaker, if you increase diff strength, at some point it becomes more likely that the axle will break before or more often than the diff.