Rock krawler jam nuts not making full contact - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 14 Old 07-09-2010, 06:15 AM Thread Starter
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Rock krawler jam nuts not making full contact

Anyone else notice this on there Rock krawler stuff

Put lower control arms on a week ago and had to file the arms square to get the jam nuts to come in full contact with the arms when tight. They had a 35 thousand gap most of the way around under the jam nut


just got my upper arms and track bar and there the same. the track bar looks to have even a larger gap at the one end

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post #2 of 14 Old 07-09-2010, 07:34 AM
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never looked, to be honest I never cared its a jam nut, its still doing its job.
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post #3 of 14 Old 07-09-2010, 08:22 AM
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Sir

Please give the office a call and we can help you out.

How tight are you getting the jam nuts? There could be a ton of powder coat on the arms. We have been working with some new powder coat in house that has a crazy finish.

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post #4 of 14 Old 07-09-2010, 09:24 AM
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can't say i ever looked. i just tightened the hell out of them and they haven't budged
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post #5 of 14 Old 07-09-2010, 10:54 AM
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Quote:
Originally Posted by Rock Krawler Suspension View Post
Sir

Please give the office a call and we can help you out.

How tight are you getting the jam nuts? There could be a ton of powder coat on the arms. We have been working with some new powder coat in house that has a crazy finish.

Rock Krawler
in an honest question: Besides the main reason for jam nuts is there any structual need or perk to them having "full" contact with the surface they are jammed against ?
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post #6 of 14 Old 07-09-2010, 04:16 PM
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Quote:
Originally Posted by usmcdoc14 View Post
in an honest question: Besides the main reason for jam nuts is there any structual need or perk to them having "full" contact with the surface they are jammed against ?
Yes. The jam nut is used to preload the threads of the rod end/ tube union. If the jam nut is not flat the load will be uneven. The preload is needed to prevent wear and thread failure. It may not be as critical with our big boy shit, but this is what is preached in the aviation world.

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This is exactly why we need to practice proper gun control.

If he was aiming down the sights correctly and had plenty of practice rounds under his belt, there would only be one side of this story.
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post #7 of 14 Old 07-09-2010, 06:27 PM Thread Starter
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Quote:
Originally Posted by Rock Krawler Suspension View Post
Sir

Please give the office a call and we can help you out.

How tight are you getting the jam nuts? There could be a ton of powder coat on the arms. We have been working with some new powder coat in house that has a crazy finish.

Rock Krawler

I called and talked to someone before. After I noticed this on my lower arms

Was told this was a first of hearing about anything like this.So I figured ok stuff happens

was offered to return them but I just asked if it would be ok to grind or file them down first to see if that would work. was told ok and if that didn't work to call back

Jam nuts were tightened down very tight
I thought it could be the powder coat at first also but its not

Just wanted to find out how others were dealing with this and if they noticed this also.

Side note
I love how heavy duty the parts are

Some pics of what I did to get the lowers square



RK 3.5 LIFT/RRD SHOCKS/FRONT CONTROL ARMS/DRAG LINK/TRACK BAR/REAR BRAKE HOSES/COOPER 295-75-17 STT JEEPERMAN FRONT BUMPER SUPERWINCH EPI9 JKS LOWER TRACK BAR BRACES/DISCONNECTS CRAGAR WHEELS SOFT 8 SYNERGY UPPER TRACK BAR BRACES RR SKID PLATES BENCHMARK DESIGNS EVAP SKID
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post #8 of 14 Old 07-10-2010, 06:32 PM
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by the way, crawled under to give mine another look and the are flush.
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post #9 of 14 Old 07-10-2010, 07:48 PM
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Way over analyzed issue. we have been installing rockKrawler products for just over 7 years now, and yes, some of the arms have this "issue" but, If the Jam nut is tightened correctly with a few drops of red Loctite, you will never have an issue with it. Also, remember that, as a part of mechanical preserverence, you will need to periodicly check the tightness of EVERY suspension compnent. It is the end users responsibility to check the tightness of anything suspension related after a hard wheeling session.


Joe
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post #10 of 14 Old 07-12-2010, 09:53 AM
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Engineering just gave us the specs on the cuts on the end of the bar and they are to be within .020 or 20 thousands perpendicularity to the axis of the bar!

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post #11 of 14 Old 07-12-2010, 09:58 AM
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Originally Posted by Absolute Offroad View Post
Way over analyzed issue.

Joe
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No doubt. My tape measure only goes down to 1/16".

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post #12 of 14 Old 07-12-2010, 10:48 AM
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WOW. You done gots you one of dem new fangled measurin sticks huh??
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post #13 of 14 Old 07-12-2010, 03:13 PM
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With .020 tolerance and the usual tolerances dealing with threads, this would mean .020 feeler guage will fit untorqued, but under torque the jamnut will be flush all the way around.

Obama, The greatest gun salesman since the invention of firearms.
Quote:
Originally Posted by Jscwerve View Post
This is exactly why we need to practice proper gun control.

If he was aiming down the sights correctly and had plenty of practice rounds under his belt, there would only be one side of this story.
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post #14 of 14 Old 07-12-2010, 03:35 PM
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Quote:
Originally Posted by Absolute Offroad View Post
WOW. You done gots you one of dem new fangled measurin sticks huh??
Yeehaw, it even sucks inside of a shiny box when not measuring.

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