Anything special I'd need to do before jacking up car to swap tire
11-25-2011, 10:54 PM
#11
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There's 3 arguable points to this jacking up the car thread. I agree with mmitev on all 3:
1) Do you break the wheel nuts free with or without jacking up the car. If you partially jack up the car leaving the wheel firmly on the ground, you've lightened the 1000 lb load (4000 lbs car / 4 wheels) on the nut and wheel making it easier for you to break the nut free.
1) Do you break the wheel nuts free with or without jacking up the car. If you partially jack up the car leaving the wheel firmly on the ground, you've lightened the 1000 lb load (4000 lbs car / 4 wheels) on the nut and wheel making it easier for you to break the nut free.
- Antti -
11-26-2011, 07:43 AM
#12
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There's 3 arguable points to this jacking up the car thread. I agree with mmitev on all 3:
1) Do you break the wheel nuts free with or without jacking up the car. If you partially jack up the car leaving the wheel firmly on the ground, you've lightened the 1000 lb load (4000 lbs car / 4 wheels) on the nut and wheel making it easier for you to break the nut free.
2) How much do you loosen the nuts after you beak them free: IMO, all you have to do is break the nut loose. Once you have the wheel in the air, it will spin off without any more effort. To "loosen all the bolts ... so they're nearly off" means you have to figure out when they nearly off and is just unnecessary extra work.
3) (This is probably the most important of the 3 questions) When do you torgue the wheel nuts: Torgue the nuts after you've lowered the wheel so it's firmly on the ground but not completely on the ground. Torguing with the wheel partially on the ground means you get a more accurate torgue reading because you're not trying to tighten the nut with 1000 lbs of pressure between the nut and wheel.
1) Do you break the wheel nuts free with or without jacking up the car. If you partially jack up the car leaving the wheel firmly on the ground, you've lightened the 1000 lb load (4000 lbs car / 4 wheels) on the nut and wheel making it easier for you to break the nut free.
2) How much do you loosen the nuts after you beak them free: IMO, all you have to do is break the nut loose. Once you have the wheel in the air, it will spin off without any more effort. To "loosen all the bolts ... so they're nearly off" means you have to figure out when they nearly off and is just unnecessary extra work.
3) (This is probably the most important of the 3 questions) When do you torgue the wheel nuts: Torgue the nuts after you've lowered the wheel so it's firmly on the ground but not completely on the ground. Torguing with the wheel partially on the ground means you get a more accurate torgue reading because you're not trying to tighten the nut with 1000 lbs of pressure between the nut and wheel.
True, Anzafin brings up a fair point about the weight resting on the hub... But given that the final amount of work is absolutely the same, I would go the safer route anytime with my own car.
11-26-2011, 08:16 AM
#13
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My Ride: 2007 530xiT: CPO purchase in 2008, used by a BMW exec previously, and like-new when I got it. Compared to my other cars, at first I thought it felt heavy and steering was too heavy. Now, I really enjoy driving it in town and on the freeway. On my
Good point, Anzafin, I forgot about that lip. But, there's still inward-outward load on the nut which the lip can't offload. IMO, you would still get a more accurate reading by torguing while the wheel is firmly but not completely on the ground.
11-28-2011, 04:49 AM
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My Ride: 535XIT Space Gray, Cream Beige LeatherCold Weather, Premium, Auto, Rear Side Window Shapes, Heated Rear Seats, Park Distance, Navigation, Satellite Radio
Model Year: 08
Two questions:
1) Does leaving the tailgate open turn off the air suspension or should you do something else?
2) Where can you get the floor jack adapters, and do you need them?
1) Does leaving the tailgate open turn off the air suspension or should you do something else?
2) Where can you get the floor jack adapters, and do you need them?
11-28-2011, 03:21 PM
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My Ride: 2010 535 xi - M Sport Pkg & other goodies
2 - They're $20 at ECS Tuning (or N54 Tuning in Canada or Burger Tuning in US), and it definitely is handy using one, though I have tried a couple of times with just a hockey puck (with some grooves cut into it with an X Acto knife so it won't slip), and it's worked too without crushing the jack pad part on the car.
http://www.ecstuning.com/ES251251/
My jack has a flat rubber pad, which probably would have worked too had I tried. Some jacks though don't come with a nice flat surface like that.
http://www.canadiantire.ca/AST/brows....jsp?locale=en
11-28-2011, 04:22 PM
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My Ride: 2010 535i M Sport 6MT
Model Year: 2010
I didn't see two things that should be mentioned:
1) Ensure vehicle remains stationary: flat surface, in park (auto) or in gear (manual), parking brake engaged, wheel chock in place (in opposite corner)
2) Recheck wheel bolt torque after 50 mi or km
By opposite corner I mean, if lifting front driver corner, wheel chocks should be in place at rear passenger corner.
1) Ensure vehicle remains stationary: flat surface, in park (auto) or in gear (manual), parking brake engaged, wheel chock in place (in opposite corner)
2) Recheck wheel bolt torque after 50 mi or km
By opposite corner I mean, if lifting front driver corner, wheel chocks should be in place at rear passenger corner.
11-29-2011, 04:49 AM
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My Ride: 535XIT Space Gray, Cream Beige LeatherCold Weather, Premium, Auto, Rear Side Window Shapes, Heated Rear Seats, Park Distance, Navigation, Satellite Radio
Model Year: 08
[quote name='Lotus99' timestamp='1322526093' post='1402395']
1 - Don't know, why leave it open anyway?
I would think that you would want to turn off the air suspension when you are lifting the car?
1 - Don't know, why leave it open anyway?
I would think that you would want to turn off the air suspension when you are lifting the car?
12-08-2011, 10:15 AM
#18
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My Ride: 2010 535 xi - M Sport Pkg & other goodies
Update: So I changed my tires the other day, and just tried to do it like with my 335, but just jacking up the rear first. Well, the car's stiff enough I guess that the front tire even goes up, if you jack high enough (which is not even that high, since I have a low profile racing jack), so it saved me from having to jack up the car 4 times instead of 2! 
Also, when you just jack up the rear, the compressor doesn't go off, whereas if you jack up the front (I did it last night as I had to just change the front tire), the compressor goes off when you raise the car, presumably because a lot of weight shift happens if you lift the front.
Also, when you just jack up the rear, the compressor doesn't go off, whereas if you jack up the front (I did it last night as I had to just change the front tire), the compressor goes off when you raise the car, presumably because a lot of weight shift happens if you lift the front.
02-27-2012, 06:11 PM
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My Ride: 2004 525i
Model Year: 525i 2004
Engine: M54
I have ordered a 2 ton floor jack for lifting my 2004 525i, to check tyres. I think a 2 ton jack is enough, am I right. And it's another issue to make the jack fit the underneath point. advices appreciated.
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