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What causes alignment to go out of spec? #4680404
02/28/18 08:42 AM
02/28/18 08:42 AM
Joined: Nov 2014
Posts: 29
Canada
johnnyh55 Offline OP
johnnyh55  Offline OP
Joined: Nov 2014
Posts: 29
Canada
I know that wheel alignment goes out of spec after bushings, tie-rods, ball joints and other suspension components wear out and they have more and more play in them but what I am wondering is what causes the alignment to change after hitting a pothole? If nothing is bent, the adjustement of the tie rod doesn't actually move after hitting the pot hole right? So if the tie rods stay locked to the previous position when the wheel alignment was fine, what causes it to change after hitting a pothole?

Re: What causes alignment to go out of spec? [Re: johnnyh55] #4680419
02/28/18 09:03 AM
02/28/18 09:03 AM
Joined: Jul 2005
Posts: 30,980
NY
demarpaint Offline
demarpaint  Offline
Joined: Jul 2005
Posts: 30,980
NY
If nothing is bent, broken, jarred loose, or knocked out of adjustment then nothing would change after hitting a pot hole. In other words in order for the alignment to go out, something in the front end has to change.


God Bless Our Troops

Re: What causes alignment to go out of spec? [Re: johnnyh55] #4680443
02/28/18 09:32 AM
02/28/18 09:32 AM
Joined: Dec 2010
Posts: 436
Indianapolis, IN
09_GXP Offline
09_GXP  Offline
Joined: Dec 2010
Posts: 436
Indianapolis, IN
Sometimes a bushing can be bound up after and alignment and when you hit the pot hole it gets knocked loose. This is more common on alignment settings at the far end of specs but can happen to any unit.

Alternatively, you can hit a pot hole hard enough that the bushing temporarily deforms and then becomes bound up. Bolts will also slip a bit with the high point loads from pot holes and other factors.


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Re: What causes alignment to go out of spec? [Re: demarpaint] #4680444
02/28/18 09:35 AM
02/28/18 09:35 AM
Joined: Sep 2008
Posts: 474
Ohio
jjjxlr8 Offline
jjjxlr8  Offline
Joined: Sep 2008
Posts: 474
Ohio
Originally Posted By: demarpaint
If nothing is bent, broken, jarred loose, or knocked out of adjustment then nothing would change after hitting a pot hole. In other words in order for the alignment to go out, something in the front end has to change.


...or the back end.


1993 Toyota MR2 Turbo
2008 Mazdaspeed3
2014 Toyota Highlander XLE
Re: What causes alignment to go out of spec? [Re: johnnyh55] #4680445
02/28/18 09:38 AM
02/28/18 09:38 AM
Joined: Sep 2008
Posts: 474
Ohio
jjjxlr8 Offline
jjjxlr8  Offline
Joined: Sep 2008
Posts: 474
Ohio
Originally Posted By: johnnyh55
I know that wheel alignment goes out of spec after bushings, tie-rods, ball joints and other suspension components wear out and they have more and more play in them but what I am wondering is what causes the alignment to change after hitting a pothole? If nothing is bent, the adjustement of the tie rod doesn't actually move after hitting the pot hole right? So if the tie rods stay locked to the previous position when the wheel alignment was fine, what causes it to change after hitting a pothole?


How would you know that "nothing is bent?" Slightly bent components are difficult to detect., except with alignment rigs. There can also be measurement errors caused by the tech setting up the equipment that could be causing the change.


1993 Toyota MR2 Turbo
2008 Mazdaspeed3
2014 Toyota Highlander XLE
Re: What causes alignment to go out of spec? [Re: jjjxlr8] #4680454
02/28/18 09:49 AM
02/28/18 09:49 AM
Joined: Nov 2014
Posts: 29
Canada
johnnyh55 Offline OP
johnnyh55  Offline OP
Joined: Nov 2014
Posts: 29
Canada
Originally Posted By: jjjxlr8
How would you know that "nothing is bent?" Slightly bent components are difficult to detect., except with alignment rigs. There can also be measurement errors caused by the tech setting up the equipment that could be causing the change.


Well if the tech at the alignment shop says the alignment is out so it needs to be aligned but he doesn't mention any components needing to be replaced, wouldn't that mean nothing is bent? Or that would mean something is bent but he can get it back to spec without changing whatever componnent that is bent? So the alignment will be in spec with a bent componenent.

Re: What causes alignment to go out of spec? [Re: johnnyh55] #4680490
02/28/18 10:37 AM
02/28/18 10:37 AM
Joined: Aug 2008
Posts: 3,231
Where the wind comes sweepin'
Reddy45 Offline
Reddy45  Offline
Joined: Aug 2008
Posts: 3,231
Where the wind comes sweepin'
What about alignment cams used on control arms?

Re: What causes alignment to go out of spec? [Re: johnnyh55] #4680498
02/28/18 10:57 AM
02/28/18 10:57 AM
Joined: Sep 2004
Posts: 7,819
Marshfield , MA
andyd Online content
andyd  Online Content
Joined: Sep 2004
Posts: 7,819
Marshfield , MA
We were on our honeymoon, 4yrs after getting married. "66 Bug. In Utah on I 80 we hit a dollop of asphalt about 3" high going 60. It bent something and knocked the toe out. Badly enough to see shreds of rubber when we stopped for gas. It was re-aligned by adjusting the tie rods. Between the 4 ends, there is wide range of adjustment.

Last edited by andyd; 02/28/18 10:59 AM.

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Re: What causes alignment to go out of spec? [Re: johnnyh55] #4680512
02/28/18 11:15 AM
02/28/18 11:15 AM
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,283
N.H, U.S.A.
Just a new car "settling" in from welding stresses can go out. It can constantly pop in and out if it was not jigged right. Many mac struts don't have brake reaction rods so, you can slam on a brake and put the toe out of spec. The lower swing arm bushings can be very compliant. Garbage mac strut bolted to floppy sheet metal.

Ackermann steering geo is not great, IMO.

Last edited by ARCOgraphite; 02/28/18 11:17 AM.

2014 Nissan Rogue S CVT, OC#10 47272mi-QSUD10W30+5w20 Toughguard Filter; '17 Subaru Crosstrek CVT OC#2 ?? mi-SOA/Idemitsu 0w20 + SOA Filter
Re: What causes alignment to go out of spec? [Re: johnnyh55] #4680530
02/28/18 11:33 AM
02/28/18 11:33 AM
Joined: Dec 2009
Posts: 5,178
Tn.
CourierDriver Offline
CourierDriver  Offline
Joined: Dec 2009
Posts: 5,178
Tn.
Those darn potholes in Michigan will do it,, or the railroad tracks..imho


turn in your old jackets, shirts and other clothes to a Salvation Army or any homeless shelter this year...
Re: What causes alignment to go out of spec? [Re: johnnyh55] #4680541
02/28/18 11:51 AM
02/28/18 11:51 AM
Joined: Jun 2003
Posts: 17,817
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,817
Deplorable in apple valley, ca
If you hit a pothole and it knocks the alignment out something did get bent. Don't take much.


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Re: What causes alignment to go out of spec? [Re: johnnyh55] #4680542
02/28/18 11:56 AM
02/28/18 11:56 AM
Joined: Apr 2015
Posts: 423
Reunion Island
Superflan Offline
Superflan  Offline
Joined: Apr 2015
Posts: 423
Reunion Island
On a Renault Megane, I had a shorter distance between front and rear wheels on one side of the vehicle. I donít know if it was a pothole or the rear-ended crash Iíve been involved in, but after changing 4 corners arms, it stayed the same. Bent body?


Peugeot Partner 1.9 D, 5W40 C3, 245000 Km, running on WVO
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Re: What causes alignment to go out of spec? [Re: johnnyh55] #4680554
02/28/18 12:06 PM
02/28/18 12:06 PM
Joined: Feb 2003
Posts: 7,686
Jupiter, Florida
Cujet Online content
Cujet  Online Content
Joined: Feb 2003
Posts: 7,686
Jupiter, Florida
I've discovered that alignment issues suddenly occur after lending my cars out.


People who count on their fingers should maintain a discreet silence.
Re: What causes alignment to go out of spec? [Re: Cujet] #4680566
02/28/18 12:20 PM
02/28/18 12:20 PM
Joined: Apr 2017
Posts: 466
Utah, USA
28oz Offline
28oz  Offline
Joined: Apr 2017
Posts: 466
Utah, USA
Originally Posted By: Cujet
I've discovered that alignment issues suddenly occur after lending my cars out.


You too? eek


-----------------
1990 Nissan 300zx - Castrol Edge Euro 0W-40
2004 Nissan Quest - Pennzoil Platinum Euro 0W-40
2003 Ford Excursion 7.3 PSD - Mobil 1 TDT 5w-40
Re: What causes alignment to go out of spec? [Re: johnnyh55] #4680599
02/28/18 01:18 PM
02/28/18 01:18 PM
Joined: Sep 2008
Posts: 474
Ohio
jjjxlr8 Offline
jjjxlr8  Offline
Joined: Sep 2008
Posts: 474
Ohio
Originally Posted By: johnnyh55
Originally Posted By: jjjxlr8
How would you know that "nothing is bent?" Slightly bent components are difficult to detect., except with alignment rigs. There can also be measurement errors caused by the tech setting up the equipment that could be causing the change.


Well if the tech at the alignment shop says the alignment is out so it needs to be aligned but he doesn't mention any components needing to be replaced, wouldn't that mean nothing is bent? Or that would mean something is bent but he can get it back to spec without changing whatever componnent that is bent? So the alignment will be in spec with a bent componenent.


No, the tech won't be able to tell if some component is 'tweaked' slightly. Yes, it is possible to get the alignment back with slightly bent components. Yes, the alignment that is measured on the alignment rigs can be adjusted to be in spec with slightly bent components.

Sometimes new cars come with out of spec alignments. I've seen "non-adjustable" rear suspensions that are out of spec on a new vehicle. Camber bolts or other suspension kits are required to get them back in spec in those situations. Assuming that the car was built with non-bent components, it might have been just a stack up of tolerances during manufacturing or just a defect. It doesn't take much to change the alignment!


1993 Toyota MR2 Turbo
2008 Mazdaspeed3
2014 Toyota Highlander XLE
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