wheel nuts loosening themselves, Ke70 sedan

[off-road]

It is something fairly major as right hand side nuts almost never come loose. The torque effect of the wheel tightens right hand side wheel nuts and loosens left hand side nuts.This is why some trucks have left hand threaded nuts on the left side.
Use a torque wrench and tighten them to 80 foot pounds. If they come loose again there is a problem .
You could tighten the wheel nuts with the whheel off to see if the nuts are screwing on far enough.

[AAAAGZE]

those aren't the right nuts for the csx alloy wheel (13")

are they a little loose in the hole???

[Mos]

The torque effect of the wheel tightens right hand side wheel nuts and loosens left hand side nuts.

Huh? What torque effect? As far as I am aware there is no torque effect on the nuts themselves, not like on a pushbike pedal, or some tensioner bolts... The torque direction inverts under braking, so your statement doesn't really make sense to me.

This is why some trucks have left hand threaded nuts on the left side.

Any chance you can back that up? eg link to website that sells left hand threaded nuts for trucks?
Not saying it's not true, but I've never heard of it, and it doesn't make sense within my understanding of torque effect.

Mos.

[Sagluren]

the left hand threaded nuts is very correct, ford econovans and some other vans use this method as well. tighten the nuts to 80nm and see what happens, it could be that you are just not stretching the studs enough, if this is the case, new studs and a new pair of nuts.


cheers.

[oldcorollas]

seems torque effect should only loosen or tighten when there is a single nut for fixing something...
as soon as you have 2 or more nuts, the "torque effect" shouldn't happen, because the wheel is being held in place by 4 studs.... nut by the friction force of a single nut.

ie.. torque effect should happen for crank pulley bolt.. but shouldn't happen for flywheel bolts.....

if it was the case, then every truck and heavy vehicle would have reverse threaded nuts??
jeeps and "imperials?" had them until about 1970.. some ford and mazda vans apparently had it.. but there is really no reason for it

[Sagluren]

ohh there is a reason for it, to confuse poor apprentices and then breaking the stud.

but you are most probably correct there. i still think that a new set of studs and nuts will fix the problem.

cheers.

[off-road]

Huh? What torque effect? As far as I am aware there is no torque effect on the nuts themselves, not like on a pushbike pedal, or some tensioner bolts... The torque direction inverts under braking, so your statement doesn't really make sense to me.


Any chance you can back that up? eg link to website that sells left hand threaded nuts for trucks?
Not saying it's not true, but I've never heard of it, and it doesn't make sense within my understanding of torque effect.

Mos.

I own 3 Isuzu trucks and they all have left hand threaded wheel nuts on the left side.They are left hand threaded so trhey don't unscrew.
I also do several hundred thousand km a year in Toyota Landcruisers on corrugated dirt roads.Over the years I have had wheels come lose from time to time --always the left side, never the right.
The information I posted comes from experiance not a book or a website.

The same thing applies to CV's on the off-road buggies we race.
Only the bolts that have the bolt head on the left side come loose.That is gearbox CV on left side,wheel CV on right side.

[oldcorollas]

so it is the braking torque or the accelerating torque that loosens them?

if the wheel is a bit loose and thus can cyclically load the outerside of the nut with each revolution, mayeb is possible, but there needs to be somewhting wrong to make it worse.

[AAAAGZE]

the nuts are the wrong type for the csx wheel.

check the diameter, as they may be too small for the csx holes.

the csx nuts also have serrations under the washer to act as a sort of friction lock.

use cs-x wheel nuts, and see what happens.


.

[The Real Roadrunner]

^^^^ this dude is correct.

you need the proper shanked wheel nuts with the big washers for a csx rim.

these centre the rim first then hold it tight with the washer.



mos, most trucks use left hand thread wheel nuts on one side or the other (can't remember which)

they also run different threads for the dual wheel arrangements to aviod them backing out.

google will be your friend as i have no time to find the info nor explain it.

cheers
linden