Torque spec. for sub frame to frame bolts

[Abbypathy]

Hey everyone.

 

Would anyone happen to know what the torque requirement is for the bolts that hold the sub frame on to the frame for 97 Pathfinder.

 

Its atleast 50 lbs-ft.

 

Suspect its higher though.

 

Kind of really needing the answer.

 

The Nissan OEM repair manual doesn't specify what it is.

 

Thanks.

[hawairish]

I had the same problem when doing my SFD. You'll have to use the "Tightening Torque of Standard Bolts" table in the General Information section of the FSM.

 

Unfortunately, there doesn't seem to be a wealth of quick knowledge regarding the 4T, 7T, and 9T grades that it mentions, so I had to make a few assumptions:

1. Those grades are JIS equivalents of metric classes like 8.8 and 10.9

2. The table accounts for the nearly all bolts on the vehicle

3. The subframe hardware is of 9T grade.

 

For you, I'm also assuming that bolts for a 97 are the same as an 04. I have OEM subframe bolts sitting around, and none have the markings indicated in the FSM. Both use a 19mm socket.

 

The front subframe bolts are M12x1.25 and use a flange nut that should be tightened to 101 ft*lbs per the 97 FSM (96 ft*lbs per the 04 FSM).

The rear subframe bolts are M14x1.5 and should be tightened to 130 ft*lbs per the 97 FSM (125 ft*lbs per the 04 FSM).

 

[Abbypathy]

Thanks Hawairish.

 

I agree with your reasoning. Kind of had the same train of thought.

 

It just seems awfully high for the back ones 125 ft-lbs.

Edited January 23, 2015 by Abbypathy

[hawairish]

Agreed. Maybe it's a max in the FSM? I think I stayed around the 100-110 range on mine, which is on par with other parts using the same size bolts (like hardware for the rear traction bars).

[Abbypathy]

I totally agree. All the bolts for the rear axle are in that range. I went with 110 lbs-ft where the front axle side brackets bolt to the sub frame through rubber bushings..

 

Thanks for the help

Edited January 24, 2015 by Abbypathy