I lower until the tires just touch and go to 30%
Then set it all the way down and go to 100%
Then set it all the way down and go to 100%
Differential.I have found that with both front wheels off the ground in a FWD, the wheels turn. But if one wheel is on the ground, the other one that is off the ground wont turn. Why?
That is what I would do if I wasn't initially torqueing with an impact set to low.I lower until the tires just touch and go to 30%
Then set it all the way down and go to 100%
Huh? If you ever driven a car uphill with one wheel on ice and the other on dry pavement, you know one wheel keeps turning while the other doesn't.Differential.
Front wheels... when you shift into Park, the pawl limits the wheel rotation... but for rear wheels, people tend not to use the parking brake, so the rear wheel will spin as your torquing it.
Having the car on the ground, provides the counter weight so that one can get the torque to the right value without fighting a spinning axle.
Huh? If you ever driven a car uphill with one wheel on ice and the other on dry pavement, you know one wheel keeps turning while the other doesn't.
Actually - it does.That doesn't explain why when one wheel is on the ground and the other jack up, you can't turn that wheel that's in the air.
There are videos that show a car on icy driveway parked. Then it melts just enough to lose grip and car slides down the whole driveway with wheel spinning in opposite directions.No, the front wheels can turn with transmission in park, but while one spins forward the other spins backwards.
I run the lug nuts in using the lowest torque setting on my M18 torque gun, then I torque to spec. I use a chunk of 4X4 and chock the wheel with one foot on the block, while I torque (the tire still in the air).How ya gonna hold a wheel with one hand and tq with the other?
Ummm, there's an actual torque spec for each vehicle / wheel combination. For OEM, it's usually stated in the owners manual.So what torque do you all use? I've found 90 ft. lbs. to be a good value for most passenger cars. First clean it so you don't have corrosion or dust impairing perfect alignment of the wheel to the hub. Offset/star pattern, with a proper hand torque wrench, 2 rounds, first half the torque then full torque. I've seen shops torque them a lot tighter, or unevenly, which may cause damage like uneven pad/rotor wear and eventual brake shudder.
One wheel is 'locked' due to being on the ground (friction)...the input to the differential is 'locked' due to the parking pawl inside the transmission...so, no 'differential' action is allowed on the wheel that is free. Now if you were to jack both wheels off the ground while in park, you can spin either wheel freely (in opposite directions), or if you put the transmission in neutral (disengage the parking pawl) then the wheel that is up in the air is allow to turn freely...differential action.Actually - it does.
Now, this assumes you have an open differential...if you have limited slip or a locker...then it is going to act differently.One wheel is 'locked' due to being on the ground (friction)...the input to the differential is 'locked' due to the parking pawl inside the transmission...so, no 'differential' action is allowed on the wheel that is free. Now if you were to jack both wheels off the ground while in park, you can spin either wheel freely, or if you put the transmission in neutral (disengage the parking pawl) then the wheel that is up in the air is allow to turn freely...differential action.