Body mount bolts

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Body mount bolts

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Blazer Forum >> Mechanical & Maintenance >> General Tech Help >> 2nd Gen (1995-2005) Tech >> Body mount bolts

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Body mount bolts - 6/11/2008 12:24:08 PM

iceflames11

Posts: 262
Joined: 3/7/2006
From: Lancaster, NY
Status: offline

Ok heres the scoop, I just bought some Westin nerf bars. They are supposed to mount up to the stock body mounts. I tried getting one of the bolts out and it snapped. The other bolts won''t come out either. They are rusted pretty good I suppose. Anyways, the question is, what can I do about the snapped bolt as far as removing it? And how do I get the other bolts out without snapping them too. Any and all help is appreciated.

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2000 Blazer LS 4x4 4.3L vortec 4dr
Dynomax catback exhaust, Hypertech PP III, Granatelli MAF, 31's + 2 inch lift

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Post #: 1

RE: Body mount bolts - 6/12/2008 8:57:35 AM

FFJustin99Chevy

Posts: 381
Joined: 2/25/2007
From: Harrisburg, PA
Status: offline

When I took mine out, I used a heavy-duty breaker bar with a piece of pipe on the end to make a lever arm.

Here''s the important part though. When backing the old bolt out, keep a slow, constant pressure on the head of the bolt. If you keep jerking the socket or using the ''hammer on wrench'' techniqe, you''ll shock load the steel and shear the bolt.

Even carbon steel (Grade 5 and Grade 8 Automotive) has a limit to its shear strength which in design is somewhere around 70-80k psi. Granted this is a high number, but when you shock load a lever arm of 24-36 inches with 100 or so pounds, the instant shear load sky-rockets.

This may sound like I''m feeding a line of sh!t but I''m almost done my Structural Engineering degree and run into this a lot.

As for the old bolt, GEEZ, I guess you will have to drill it out and re-thread the hole.

Hope this helps, have fun!

< Message edited by FFJustin99Chevy -- 6/25/2008 5:22:00 AM >

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Bustin Mine 2 Save Yours!

(in reply to iceflames11)

Post #: 2

RE: Body mount bolts - 7/3/2008 12:39:51 AM

iceflames11

Posts: 262
Joined: 3/7/2006
From: Lancaster, NY
Status: offline

Thanks for the info. I did end up drilling out the old sheared bolt. As for the other ones... The hammer on wrench technique actually worked with no problems. I''m just glad its done.

_____________________________

2000 Blazer LS 4x4 4.3L vortec 4dr
Dynomax catback exhaust, Hypertech PP III, Granatelli MAF, 31's + 2 inch lift

http://www.cardomain.com/ride/2287818

(in reply to FFJustin99Chevy)

Post #: 3