Lower Control Arm Cam Bolt Failure - JeepForum.com
 
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post #1 of 12 Old 01-14-2015, 02:49 PM Thread Starter
97_JGC
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Lower Control Arm Cam Bolt Failure

Hey Guys,

On my way home from work today I noticed an all too familiar sway when braking, long story short the cam bolt in the front lower control arm was missing. One of two things happened, the bolt snapped, or Sears [and I think this is the likely scenario] didn't tighten the nut, it backed off and the bolt worked it's way out. Either way I was able to get a grade 5 7/16" inch bolt in to get her home.

I am wondering if anyone else has experienced cam bolt failure? These were approx 6 months old, no off roading just your basic daily driver. Also, does anyone know the actual diameter of the proper bolt? I would like to get a bigger bolt in there in case I need to drive it to work before the new cam bolts arrive. Seems like 1/2" would be too big, maybe metric? I wanted to put grade 8 in there but it doesn't seem like I will be getting off a hardware store shelf, may need to just over night the cam bolts.

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post #2 of 12 Old 01-14-2015, 03:14 PM
paxbnm
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When I removed my cam bolts I replaced them with 14mm bolts. I had to order them to get graded bolts though. I understand that 9/16" will fit too, easier to find locally in grade 8. I used cam bolt eliminators (basically a heavy duty washer) because I no longer needed them to adjust castor as I installed all adjustable control arms.
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post #3 of 12 Old 01-14-2015, 05:04 PM Thread Starter
97_JGC
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Thanks for the info. My local Tractor Supply had 14mm grade 8 in stock. I will install that until the new cam bolts arrive.
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post #4 of 12 Old 01-14-2015, 08:32 PM
kensnelling
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Metric bolts are graded differently. Unless the bolt head is stamped 10.9 you don't have the metric equivalent of a SAE grade 8.

Ken
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post #5 of 12 Old 01-14-2015, 09:18 PM
1998_ZJltd
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he likely got a metric 8.8 grade bolt .... they are good bolts ..... not a standard 8 but better than a 5 ...
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post #6 of 12 Old 01-15-2015, 01:51 AM Thread Starter
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Quote:
Originally Posted by kensnelling View Post
Metric bolts are graded differently. Unless the bolt head is stamped 10.9 you don't have the metric equivalent of a SAE grade 8.

Ken
Thanks for the info Ken. The bin was marked grade 8 and the head is stamped with six lines, not 10.9, which means I may have in fact grabbed a standard. Now i'm not 100% on the size. According to this chart the metric 10.9 and grade 8 bolt have the same strength?

http://www.k-tbolt.com/bolt_chart.html

I'm not too concerned though being that this is very temporary and the truck more than likely will not be driven until the cam bolt arrives. Speaking of which, any clue as to the cam bolt rating? I can't seem to find that info.
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post #7 of 12 Old 01-15-2015, 10:04 AM
tucsonzj
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Yes metric 10.9 and SAE grade 8 are rated the same, which is what Ken stated. From factory cam bolts are grade 8 IIRC

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post #8 of 12 Old 01-15-2015, 10:12 AM
kensnelling
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Quote:
Originally Posted by 1998_ZJltd View Post
he likely got a metric 8.8 grade bolt .... they are good bolts ..... not a standard 8 but better than a 5 ...
A metric 8.8 bolt is equivalent to an SAE grade 5 bolt.

Quote:
Originally Posted by 97_JGC View Post
Thanks for the info Ken. The bin was marked grade 8 and the head is stamped with six lines, not 10.9, which means I may have in fact grabbed a standard. Now i'm not 100% on the size. According to this chart the metric 10.9 and grade 8 bolt have the same strength?

http://www.k-tbolt.com/bolt_chart.html

I'm not too concerned though being that this is very temporary and the truck more than likely will not be driven until the cam bolt arrives. Speaking of which, any clue as to the cam bolt rating? I can't seem to find that info.
As long as the bolt is not loose in the bushing or brackets you should be fine. And yes, as tusconzj stated, I believe the cam bolts are a grade 8.

Ken
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post #9 of 12 Old 01-15-2015, 12:51 PM Thread Starter
97_JGC
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Quote:
Originally Posted by tucsonzj View Post
Yes metric 10.9 and SAE grade 8 are rated the same, which is what Ken stated. From factory cam bolts are grade 8 IIRC

Yes, my mistake on the info given, posting on the first cup of coffee. I know this is not a big deal but this front end has been a project over the last several months on and off and I was finally all buttoned up when this happened so I am a little agitated. I found one of the cam bolt washers in my parking spot at work. It must have been frozen and fell off during the day. I searched for the bolt but no go. I really would like to know if it failed or not but I guess I'll never know.

Thanks for the help guys, it is appreciated.
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post #10 of 12 Old 01-15-2015, 01:10 PM
tucsonzj
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haha sometimes ya just gotta let it go. Besides I'm usually happy when I put in new bolts lol

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post #11 of 12 Old 01-15-2015, 01:17 PM
Pierre_r
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If i was near NY i could give you one of those cambolts for free.
I have 7-8 of them just laying around for some reason.
But as it is now the shipping would be $$$

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post #12 of 12 Old 01-15-2015, 01:34 PM Thread Starter
97_JGC
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I ordered through Rock Auto, not too bad for one, about $14 delivered. Everyone else seems to sell in pairs. Probably wouldn't be a bad idea for me to have a spare anyway.
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