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Old 05-23-2014, 09:47 PM   #1
C3hutson
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Default This is the last time i blindly trust subaru's torque specs: tranny crossmember bolt

103 ft-lbs seemed steep, but hey, the car has 14k miles and I figured chances of breaking something were slim.

Needless to say I got to 90 ft-lbs and it started spinning with less resistance. Read that the issue is a less than 103 ft-lb capable nut welded to the unibody.

I'm glad it's tight enough as is, but I'm fearing the next time the crossmember needs to be dropped. The only fix I've found involve cutting through the floor inside the car to gain access to the bolt. Any other thoughts?
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Old 05-23-2014, 10:31 PM   #2
SenorDucK
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Quote:
Originally Posted by C3hutson View Post
103 ft-lbs seemed steep, but hey, the car has 14k miles and I figured chances of breaking something were slim.

Needless to say I got to 90 ft-lbs and it started spinning with less resistance. Read that the issue is a less than 103 ft-lb capable nut welded to the unibody.

I'm glad it's tight enough as is, but I'm fearing the next time the crossmember needs to be dropped. The only fix I've found involve cutting through the floor inside the car to gain access to the bolt. Any other thoughts?
I'd probably just use the other 3 without the 4th before I'd cut a hole in the floor to access the nut to weld it back on. You may be able to tack it from below with some effort.

edit: or are you afraid of it simply spinning when trying to remove?
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Old 05-23-2014, 10:46 PM   #3
Uncle Scotty
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there ARE some errors in the fsm....and ya gotta make sure ya not bein stupid trying to torque an m8 or an m10 bolt to 100+ft-lbs
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Old 05-23-2014, 11:45 PM   #4
Scoobiesdoobies
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Did you use anti sieze?
I did this with the oem eccentric strut bolt when swapping out struts. Too much AS.
130 something lbs and it was spinning with less resistance each turn....never got the torque wrench to click.
Took it off and the anti size made the nut slip and start cross threading after already snug threaded correctly.

Replaced and didnt use a drop of anti sieze.....will be paying for it when installing my coilovers but thats what extra bolts and a 24"breaker bar are for
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Old 05-24-2014, 12:17 AM   #5
C3hutson
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Quote:
Originally Posted by Scoobiesdoobies View Post
Did you use anti sieze? I did this with the oem eccentric strut bolt when swapping out struts. Too much AS. 130 something lbs and it was spinning with less resistance each turn....never got the torque wrench to click. Took it off and the anti size made the nut slip and start cross threading after already snug threaded correctly. Replaced and didnt use a drop of anti sieze.....will be paying for it when installing my coilovers but thats what extra bolts and a 24"breaker bar are for
Yep, I did use antisieze.
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Old 05-24-2014, 12:20 AM   #6
C3hutson
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Quote:
Originally Posted by SenorDucK View Post
I'd probably just use the other 3 without the 4th before I'd cut a hole in the floor to access the nut to weld it back on. You may be able to tack it from below with some effort. edit: or are you afraid of it simply spinning when trying to remove?
I'm talking about the 17mm bolts. There are two of them. My concern is 1: I won't be able to unthread the bolt with the nut spinning ans 2: if I do get it out, what the **** am I going to thread it back into.
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Old 05-24-2014, 12:45 AM   #7
Uncle Scotty
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using anti seize changes torque values
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Old 05-24-2014, 01:01 AM   #8
C3hutson
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Old 05-24-2014, 05:44 PM   #9
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Quote:
Originally Posted by C3hutson View Post
I'm talking about the 17mm bolts. There are two of them. My concern is 1: I won't be able to unthread the bolt with the nut spinning ans 2: if I do get it out, what the **** am I going to thread it back into.
ouch. that sucks

A friend had one of the smaller ones nut spin, this was a 150k mile LGT though. That was enough for me to take it easy tightening them on my 2013.
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Old 05-25-2014, 12:12 PM   #10
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I'm pretty sure the torque spec is 103 nM, which is 75 lb ft.
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Old 05-25-2014, 02:07 PM   #11
C3hutson
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Quote:
Originally Posted by drewmob View Post
I'm pretty sure the torque spec is 103 nM, which is 75 lb ft.

Service manual states:

2. CROSSMEMBER AND CUSHION RUBBER
1) Install the rear cushion rubber.
Tightening torque:
35 Nm (3.6 kgf-m, 25.8 ft-lb)

2) Install the crossmember.
Tightening torque:
T1: 70 Nm (7.1 kgf-m, 51.6 ft-lb)
T2: 140 Nm (14.3 kgf-m, 103 ft-lb)

T1 being the 14mm head bolts (there are 4)
T2 being the 17mm head bolts (there are two)
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Old 06-01-2014, 05:00 PM   #12
C3hutson
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As an update, I was having a light "thud" noise every time I loaded and unloaded power to the trans. Knew what it was before even getting under the car. Sure enough, the bolt was just a touch too loose. Didn't know how I was going to tighten the bolt given the spinning but so used this excuse to buy a wired electric impact. About 3 second of driving the bolt and it seems perfect now!

I will, however, obviously run into an issue if/when I remove the bolt with the impact and the nut goes bye bye.
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