Torque Spec For Driveshaft To Tranny Bolts

[Shereef_Osman]

Looking for the torque spec for the bolt highlighted in yellow in the picture attached. Usually just torque everything by hand but I have a sneaky feeling a driveshaft should be torqued properly, lol.

wrh3, I stole one of your pictures from your UUC install. Hope you don't mind!

[O-cha]

It's something very high. Those nuts are supposed to be one time use BTW as they are "crush nuts"

[Swashplate]

Yikes, "Crush Nuts" ....no thanks.

[Shereef_Osman]

Originally Posted by O-cha

It's something very high. Those nuts are supposed to be one time use BTW as they are "crush nuts"

Thanks. I torqued them to 50 ft lbs. High enough?

What are crush nuts? What prevents them from being used again?

Every time I think I will finish this stupid install something else comes up, lol.

[onebluemcm]

Depends on what was dissasembled I think. I'm pretty sure TIS is saying that the bolts NOT circled and their accompanying nuts must be replaced, it's specifically talking about them and no the ones he has circled.... The ones not circled they call the ZNS bolt and nuts. Hopefully the two attachments will help some - straight from TIS. The torque part of it is confusing to me....not sure which is which. It references 26 11 1AZ in the repair, but there are a ton of different torques within that code.

[Shereef_Osman]

Originally Posted by onebluemcm

Depends on what was dissasembled I think. I'm pretty sure TIS is saying that the bolts NOT circled and their accompanying nuts must be replaced, it's specifically talking about them and no the ones he has circled.... The ones not circled they call the ZNS bolt and nuts. Hopefully the two attachments will help some - straight from TIS. The torque part of it is confusing to me....not sure which is which. It references 26 11 1AZ in the repair, but there are a ton of different torques within that code.

Thank you very very much! That is extremely informative, confusing and scary, all at the same time!

I'm guessing it is the 64 Nm?

Scary thing is crash element! I think I pushed mine together! That is one expensive oops. Although I don't get how everything goes back together nicely still?

[O-cha]

Originally Posted by Shereef_Osman

Thanks. I torqued them to 50 ft lbs. High enough?

What are crush nuts? What prevents them from being used again?

Every time I think I will finish this stupid install something else comes up, lol.

Oblong nuts, they basically lock themselves in place. The proper torque is 85 ft lb.

Originally Posted by onebluemcm

Depends on what was dissasembled I think. I'm pretty sure TIS is saying that the bolts NOT circled and their accompanying nuts must be replaced, it's specifically talking about them and no the ones he has circled.... The ones not circled they call the ZNS bolt and nuts. Hopefully the two attachments will help some - straight from TIS. The torque part of it is confusing to me....not sure which is which. It references 26 11 1AZ in the repair, but there are a ton of different torques within that code.

It calls for them to be replaced, as well as the "ZNS" bolts which refers to torx head nuts.

[Shereef_Osman]

Originally Posted by O-cha

Oblong nuts, they basically lock themselves in place. The proper torque is 85 ft lb.




It calls for them to be replaced, as well as the "ZNS" bolts which refers to torx head nuts.

Guess I got to buy some bolts tomorrow, delays me putting my car back together.

Where do you get the 85 ft lbs from? In the torques pdf onebluemcm posted, the only place I see 115 Nm (85 ft lbs) is for the M3 & M5.

On the bolt it says 10.9, so that limits our choices to either M10 10.9 (64 Nm) or M12 10.9 (100 Nm). I have no idea what M10 or M12 is, the bolt actually has an 18mm head, lol.

[O-cha]

Originally Posted by Shereef_Osman

Guess I got to buy some bolts tomorrow, delays me putting my car back together.

Where do you get the 85 ft lbs from? In the torques pdf onebluemcm posted, the only place I see 115 Nm (85 ft lbs) is for the M3 & M5.

On the bolt it says 10.9, so that limits our choices to either M10 10.9 (64 Nm) or M12 10.9 (100 Nm). I have no idea what M10 or M12 is, the bolt actually has an 18mm head, lol.

Use 50 ft lbs and don't replace the bolts or nuts then.

[Shereef_Osman]

Originally Posted by O-cha

Use 50 ft lbs and don't replace the bolts or nuts then.

No need to be an ass, I'm not doubting you, just want your reasoning.

[Shereef_Osman]

Originally Posted by O-cha

Oblong nuts, they basically lock themselves in place. The proper torque is 85 ft lb.

It calls for them to be replaced, as well as the "ZNS" bolts which refers to torx head nuts.

You are correct sir. They are all ZNS bolts and all must be replaced. They are the M12 10.9 bolts, so they require 100 Nm (74 ft lbs).