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Old 01-31-2012, 08:25 PM   #1
V8 GTFO Lesbic WGN
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Default Unibody Deformation Due to Long Term Use of Jack Stands During Clutch Replacement

I have had my '07 Forester XT on jack stands for over a month while installing a new clutch, I am concerned about unibody deformation due to the small foot print of the jacks supporting 3,300lbs (825lbs per corner), are my worries unfounded?
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Last edited by V8 GTFO Lesbic WGN; 01-31-2012 at 08:33 PM.
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Old 01-31-2012, 08:37 PM   #2
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if they are properly placed....forgetaboutit
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Old 01-31-2012, 08:40 PM   #3
V8 GTFO Lesbic WGN
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yes they are mounted at the factory locations where the OEM scissor jack is intended to go.




Pinched weld savers:




Last edited by V8 GTFO Lesbic WGN; 02-01-2012 at 04:36 PM.
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Old 01-31-2012, 08:42 PM   #4
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just dont go havin any wild frat parties in it while it is up on stands and it wont even know it was ever off the ground
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Old 01-31-2012, 08:47 PM   #5
V8 GTFO Lesbic WGN
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^nice to have an Uncle to guide and look after us.
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Old 01-31-2012, 11:12 PM   #6
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I have a question about those jack stands - do the rubber things help? I bought those jack stands but after looking at the (I'm going to refer to the part that meets the vehicle as the fork) fork, and positioning it under the jack spots I was afraid the indent was too deep and the sides of the fork would cut into side skirt. I was seriously debating sawing off the sides a little.

I have an STi not a forester but maybe it's similar.
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Old 02-01-2012, 12:03 AM   #7
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I sawed the rubber jack stand protectors for my RIP '06 STi, just the skirt side, look closely at the pic, the ourboard side next to the side skirt has a sawed off step.
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Old 02-01-2012, 01:07 AM   #8
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Alright cool, I'll buy those red rubber things and see how things fit for myself. I was mainly afraid the red rubber things wouldn't solve the problem.
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Old 02-01-2012, 04:40 PM   #9
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added one more pic of the Harbor Freight jack stand cushions showing the cutoff to protect the side skirt. And the enlarged semicircle to clear the pinch weld.
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Old 02-06-2012, 12:31 PM   #10
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My bugeye has been on stands for over a year and although it hasn't come down yet (next couple days!) I don't notice any deformation as it sits.
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Old 02-06-2012, 01:49 PM   #11
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^It would be impossible to notice deformation at first glance, are you using pinch weld locations? Just seems 825lbs a corner is a lot, mine has been on stands for a month and I feel very uncomfortable, get the feel I am doing a diservice to the unibody taking on so long to swap the clutch, I have run into several snags that prevent me to finish the job within a reasonable time.

I will probably put everything back to give the unibody a break.

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Old 02-06-2012, 05:10 PM   #12
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/\ I don't think its impossible, on the contrary, if it isn't straight I would immediatly recognize, I mean, I'm under there pretty much every afternoon...

The car IS resting on the pinch welded seam. I can imagine this being a problem if you set it up on jacks on an uneven, non-level surface, otherwise I think you are overreacting...

On another note, I've let my '84 subaru wagon sit on stands for an equal, if not longer period of time with zero ill effects. I think you're ok...
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Old 02-09-2012, 07:46 PM   #13
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Speaking just of the Forester (mine is an older model, 2004), isn't there a "frame" or an "axle" location(s) where one can use a floor jack and jack stands rather than lifting on the body? It seems okay that one would need some easy to get to place to support emergency tire changes by the side of the road, but when in the garage over flat concrete can't we place a floor jack under the car somewhere else?
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Old 04-22-2012, 12:33 PM   #14
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I had my car up on jack stands for over 12 months. Out of country.

Car is fine so are the pinch welds.
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Old 04-22-2012, 01:13 PM   #15
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Quote:
Originally Posted by Jerry_NJ View Post
Speaking just of the Forester (mine is an older model, 2004), isn't there a "frame" or an "axle" location(s) where one can use a floor jack and jack stands rather than lifting on the body? It seems okay that one would need some easy to get to place to support emergency tire changes by the side of the road, but when in the garage over flat concrete can't we place a floor jack under the car somewhere else?
Front by subframe there is a jacking plate 4x4.
Rear place jack on rear differential.

Last edited by V8 GTFO Lesbic WGN; 04-22-2012 at 01:20 PM.
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Old 04-22-2012, 01:19 PM   #16
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Quote:
Originally Posted by runner19 View Post
I had my car up on jack stands for over 12 months. Out of country.

Car is fine so are the pinch welds.
Impossible to detect by the human eye, unibodies are welded with resins and with time under stress/strain eventually the bond will be compromised, I am now using ramps or supporting the car at the location where dealers place the hydraulic lift forks using 4x6 to spread the load.
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Old 04-23-2012, 04:27 AM   #17
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Quote:
Originally Posted by V8 GTFO Lesbic WGN View Post
Impossible to detect by the human eye, unibodies are welded with resins and with time under stress/strain eventually the bond will be compromised, I am now using ramps or supporting the car at the location where dealers place the hydraulic lift forks using 4x6 to spread the load.
you are quite completely out of your mind
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Old 04-24-2012, 09:58 PM   #18
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You will be fine. I wouldnt lean on that thing to hard, but you'll be fine.
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Old 04-25-2012, 10:01 AM   #19
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Why are you worried about deformation anyway? Even if it does deform it a little, who cares? Are you going to be pulling 1.5g's with r-compound tires on a race track? No? Then fuhgettaboutit.

If you are anal, buy yourself some racing scales, and measure the cornerweights before and after it sits on the jack stands. This will tell you if the car is tweaked. Also, you can then buy some coilovers so you can set the corner weights. While you are at it, you should seam weld the unibody for increased torsional rigidity. Of course, you should get a jig for the car that is set to manufacturers recommendations so you know the body is straight. Finally, put an 8 point roll cage so the car will never be out of whack again.

Or just drive the car.
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