I hope GM must recall Buick Envision - Buick Envision Forum
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post #1 of 62 (permalink) Old 07-19-2017, 05:40 AM Thread Starter
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I hope GM must recall Buick Envision

I come from China,I am a Buick Envision User,And I find that GM applied a new structure on lower control arm,It named "split-type lower control arm bushing".
Since 2014 ,"split-type bushing" applied on multiple models of GM,Such as Buick Envision,Buick LaCrosse2017,Chevrolet Malibu2016 and 2017.
"split-type bushing" is mainly composed of front little bolt,inner sleeve,rear little bolt,vulcanized rubber,outer sleeve.It is applied on lower control arm and be installed on frame.
"split-type bushing" easy to plastic deformation under low velocity impact!This is a design deficiency of product!Must be Recall!
Attached Images
File Type: jpg split-sleeve bush pic-1.jpg (118.4 KB, 19 views)
File Type: jpg 20.jpg (79.1 KB, 18 views)
File Type: jpg 2017 Buick Envision -1.jpg (124.6 KB, 16 views)
File Type: jpg 2017 Buick Envision -2.jpg (112.7 KB, 12 views)
File Type: jpg xian-1.jpg (258.7 KB, 16 views)
File Type: jpg Lower Control Arm - GM (84107268) wholesalegm.jpg (81.4 KB, 13 views)
File Type: jpg QQ??20170714204531.jpg (15.0 KB, 11 views)
File Type: jpg QQ??20170714222210.jpg (35.4 KB, 10 views)
File Type: jpg 9.jpg (62.8 KB, 9 views)
File Type: jpg 7.jpg (109.7 KB, 13 views)
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post #2 of 62 (permalink) Old 07-20-2017, 07:53 PM
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For and aft pictures of the front control arm. 2016 Premium AWD with Hyperstrut front end.
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File Type: jpg 20170720_193539_1500594805871.jpg (83.0 KB, 25 views)
File Type: jpg 20170720_193436_1500594822823.jpg (99.1 KB, 20 views)
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post #3 of 62 (permalink) Old 07-20-2017, 08:01 PM
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It looks like the control arm mounting broke. Not very common but it does happen from corrosion from salt applied to roads during the winter time in North America. It can happen from hitting an object or a pothole.

I jump the rail road tracks near work sometimes and have unloaded the front end but nothing broke.
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post #4 of 62 (permalink) Old 07-20-2017, 11:06 PM
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how to check split-type bushing?

Quote:
Originally Posted by NormT View Post
For and aft pictures of the front control arm. 2016 Premium AWD with Hyperstrut front end.
Please check the split-type bushings of lower control arm follow the attchments picture!
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File Type: jpg check lower control arm1.jpg (77.7 KB, 20 views)
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post #5 of 62 (permalink) Old 07-20-2017, 11:23 PM
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I can answer your question

Quote:
Originally Posted by NormT View Post
It looks like the control arm mounting broke. Not very common but it does happen from corrosion from salt applied to roads during the winter time in North America. It can happen from hitting an object or a pothole.

I jump the rail road tracks near work sometimes and have unloaded the front end but nothing broke.
Because , in most cases,front shock absorber support motor vehicle absorb impact.
But split-type bushings mechanical strength shortage!It is easy to plastic deformation.(As the material is deformed beyond the strain that elastic deformation persists, the stress is no longer proportional to strain, and permanent, nonrecoverable, or plastic deformation occurs. )
The inner sleeve is hollow and metal material is very thin.
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File Type: jpg Bolt-3.jpg (34.9 KB, 8 views)
File Type: jpg Bolt-1.jpg (13.8 KB, 8 views)
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post #6 of 62 (permalink) Old 07-20-2017, 11:44 PM
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Quote:
Originally Posted by NormT View Post
It looks like the control arm mounting broke. Not very common but it does happen from corrosion from salt applied to roads during the winter time in North America. It can happen from hitting an object or a pothole.

I jump the rail road tracks near work sometimes and have unloaded the front end but nothing broke.
Split-type Bushing is a unsafe structure!Since 2014, lower control arm falls off led to a series of accidents!
Attached Images
File Type: jpg 10.jpg (87.2 KB, 3 views)
File Type: jpg 1.jpg (80.7 KB, 5 views)
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post #7 of 62 (permalink) Old 07-21-2017, 12:05 AM
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You will face same problem ,Because interference fit structure is not strong!Once inner sleeve plastic deformation,it will become dangerous.Will led to lower control arm falls off!
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post #8 of 62 (permalink) Old 07-21-2017, 02:56 AM
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Quote:
Originally Posted by Walk Sky View Post
I come from China,I am a Buick Envision User,And I find that GM applied a new structure on lower control arm,It named "split-type lower control arm bushing".
Since 2014 ,"split-type bushing" applied on multiple models of GM,Such as Buick Envision,Buick LaCrosse2017,Chevrolet Malibu2016 and 2017.
"split-type bushing" is mainly composed of front little bolt,inner sleeve,rear little bolt,vulcanized rubber,outer sleeve.It is applied on lower control arm and be installed on frame.
"split-type bushing" easy to plastic deformation under low velocity impact!This is a design deficiency of product!Must be Recall!
About 5-10 KM speed,when Front wheel touch stone or other wheel ,split-type bushings would plastic deformation ,even falls off!
Attached Images
File Type: jpg 11.jpg (87.6 KB, 11 views)
File Type: jpg 2017 Buick Envision -3.jpg (106.0 KB, 9 views)
File Type: jpg IMG_2948.JPG (164.5 KB, 11 views)
File Type: jpg QQ??20170117123712.jpg (115.7 KB, 12 views)
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post #9 of 62 (permalink) Old 07-21-2017, 03:51 AM
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Quote:
Originally Posted by NormT View Post
It looks like the control arm mounting broke. Not very common but it does happen from corrosion from salt applied to roads during the winter time in North America. It can happen from hitting an object or a pothole.

I jump the rail road tracks near work sometimes and have unloaded the front end but nothing broke.
A standardized stress test ,What's clear is that sofar,split-type bushing is structurally weak!
A solid steel bolt is the right choice!
Attached Images
File Type: jpg 14.jpg (634.3 KB, 9 views)
File Type: jpg QQ??20161129110618.jpg (91.3 KB, 10 views)
File Type: jpg QQ??20161206090600.jpg (258.6 KB, 10 views)
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post #10 of 62 (permalink) Old 07-21-2017, 10:17 AM
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What is really clear is that your testing method is flawed. The split-type bushing was designed to used on a control arm that has other mounting points and support.

For a through test, mount the control arm on the vehicle then stress test it.

Besides, the fender is dented which means this vehicle was in an accident and components replaced before considered road worthy.
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