Bolt broke on track bar on axle side.

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Oct 21, 2010 | 02:22 PM

desert-rat

Thread Starter

Junior Member

Joined: Sep 2010

Posts: 99

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From: So-Cal

Year: 2001

Model: Cherokee

Engine: 244 c.i.

Bolt broke on track bar on axle side.

So I pulled off the bolt to check the bushings. Attempting to put the bolt back on at 74 foot lbs, the bolt snapped in half and wasn't even at 60 foot lbs yet. Got a new 10.9 bolt and now am afraid to try torquing it again.

Oct 21, 2010 | 02:33 PM

TrekkerJmm

"CF Moderator"

Joined: Sep 2008

Posts: 3,045

Likes: 3

From: N.J. Shore Area

Year: 1994

Model: Cherokee

Engine: l6 HO

Quote:

Originally Posted by desert-rat

10.9 should be good for 74 plus lots more. I dont know the exact max psi but i'll look around. Are you using a torque wrench?...Tj

EDIT: just checked on google and found this "Grade 8 min tensile strenght is 150K PSI and 10.9 is 142.2K"

Last edited by TrekkerJmm; Oct 21, 2010 at 02:35 PM.

Oct 21, 2010 | 02:36 PM

96_xj

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Joined: Mar 2010

Posts: 8,135

Likes: 16

From: Gilbert AZ/Las Cruces NM

Year: 1996

Model: Cherokee

Engine: 4.0 upgraded

a 10.9 is the metric equivalent to a SAE grade 8. You are good up to 150 ftlbs (if not more) i believe.
the track bar is suppose to be torqued down to

Track Bar
Ball Stud Nut.............. 81 N·m (60 ft. lbs.)
AxleBracketBolt .........100N·m(74ft.lbs.)

Oct 21, 2010 | 02:52 PM

s14unimog

CF Veteran

Joined: Dec 2009

Posts: 1,396

Likes: 2

Model: Cherokee

***** 60ft/lbs seems high for a ball joint. I thought those were 35ft/lbs...

Oct 21, 2010 | 02:53 PM

desert-rat

Thread Starter

Junior Member

Joined: Sep 2010

Posts: 99

Likes: 0

From: So-Cal

Year: 2001

Model: Cherokee

Engine: 244 c.i.

Quote:

Originally Posted by TrekkerJmm

I did use a torque wrench. Maybe the new bolt will hold.

Oct 21, 2010 | 02:53 PM

96_xj

Honorary Moderator

Joined: Mar 2010

Posts: 8,135

Likes: 16

From: Gilbert AZ/Las Cruces NM

Year: 1996

Model: Cherokee

Engine: 4.0 upgraded

Quote:

Originally Posted by s14unimog

***** 60ft/lbs seems high for a ball joint. I thought those were 35ft/lbs...

That is right out of the Factory Service Manual

Oct 21, 2010 | 03:06 PM

letsgomuddin

Senior Member

Joined: Nov 2009

Posts: 774

Likes: 7

From: Lowell, MI

Year: 2001

Model: Cherokee (XJ)

Engine: 4.0

the old bolt broke because it stretched. I don't know how many track bar bolts i've taken out that are really thin in the middle

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Oct 21, 2010 | 03:09 PM

JeepingDan

CF Veteran

Joined: Apr 2009

Posts: 18,786

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From: CT.

Year: 88

Model: Comanche (MJ)

Engine: 4.0 HO

Quote:

Originally Posted by 96_xj

X2 if it broke near 60 then its was gonna break at the wrong time. Good thing you caught it now then when you were on the road.

Oct 21, 2010 | 03:50 PM

cw50must

Member

Joined: Mar 2009

Posts: 245

Likes: 0

From: Mesa, AZ

Year: 1998

Model: Cherokee

Engine: 4.0

Yeah, mine broke On the I-10 on my way home from work one evening. That was fun trying to get to the side of the road. Luckily I only suffered a bent control arm.

May 6, 2016 | 09:40 PM

#10

scottfisher

Junior Member

Joined: Jun 2009

Posts: 46

Likes: 0

Model: Cherokee

Quote:

Originally Posted by 96_xj

I have just replaced the bushing on the track bar.

I'm double checking the torque speck for the axle bracket bolt on the track bar at 74ft/lbs . My bolt has the factory installed nut and the nut has the tab welded to it. the nut looks thin for a nut that needs to be torqued to 74ft/lbs.

I'm thinking I'll be replacing the nut to achieve that high a spec.

So, is 74 the correct spec?

s

May 6, 2016 | 10:54 PM

#11

darknezz

Senior Member

Joined: Mar 2010

Posts: 812

Likes: 1

From: Eugene, OR

Year: 1989

Model: Cherokee

Engine: 4.7 Stroker I6

Yes...

Yes replace that nut

May 7, 2016 | 08:59 AM

#12

97grand4.0

CF Veteran

Joined: Nov 2015

Posts: 2,863

Likes: 201

From: syracuse ny

Year: 1997 230,000 miles

Model: Grand Cherokee (ZJ)

Engine: 4.0, new lifters valve job with new springs and exhaust valves, preload set with shims

Usually the hole in the axle side is wobbled out as well. With a new grade 10 nut AND BOLT, I don't see why you cant tighten it to even more than the 74 ft/lbs, I did, ..74 is for the factory nut and bold which are inadequate IMO.
Couple lock washers on there never hurt either.