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-   -   Driveshaft Bolts (http://www.clubcobra.com/forums/all-cobra-talk/102654-driveshaft-bolts.html)

Juggernaut 02-08-2010 07:22 PM
Driveshaft Bolts
 
While doing the "winter inspection" on my Cobra, I noticed the driveshaft bolts had loosened up where the driveshaft attaches to the diff. It has a 8.8 solid rear and has 3000 miles on it. I used the correct bolt, Ford PN N800594-S100 and used loctite on them when I originally installed them.

I'm replacing all the bolts but I'm wondering now should there be a lock washer on them too?

Thanks for the help!:)

patrickt 02-08-2010 07:46 PM
Quote:
Originally Posted by Juggernaut (Post 1026942)
I'm replacing all the bolts but I'm wondering now should there be a lock washer on them too?
Use grade 8 bolts, washers, and stover nuts.:cool:

strictlypersonl 02-09-2010 08:31 AM
It's also very important that the bolts are properly torqued to spec.

Rick Parker 02-09-2010 08:52 AM
Use the OEM bolts and nuts, torque to spec and if the holes have been elongated you have more issues.

I believe the 12 pt heads are a metric size and are much higher quality than typical grade 8.
Maybe 10.9 in metric terms??

Juggernaut 02-09-2010 09:35 AM
Quote:
Originally Posted by Rick Parker (Post 1027112)
Use the OEM bolts and nuts, torque to spec and if the holes have been elongated you have more issues.
Thanks for the info guys!

Does anyone know what the torque should be? I checked the holes & thank goodness they're not elongated.

Clois Harlan 02-09-2010 12:18 PM
3/8" Grade 8 bolts should be around 55 pounds (dry)

7/16" Grade 8 bolts should be around 75 pounds (dry)

But the Ford service manual says 71-95 ft pounds of torque.

Juggernaut 02-09-2010 12:23 PM
Quote:
Originally Posted by Clois Harlan (Post 1027181)
3/8" Grade 8 bolts should be around 55 pounds (dry)

7/16" Grade 8 bolts should be around 75 pounds (dry)

But the Ford service manual says 71-95 ft pounds of torque.
Thanks Clois, I have the 7/16" bolts so 75 it is.

xlr8or 02-09-2010 12:26 PM
Patrick, the 8.8 doesn't use nuts. The bolts thread into the input flange on the diff. Use proper torque as Bob said (about 75 ft. lbs) and some red loctite and they should be fine.

Silverback51 02-09-2010 02:47 PM
Mine were loose when I bought my car. Put some red loctite on them and they have never moved.

vector1 02-09-2010 03:34 PM
i used blue loctite and 65 lbs. on the allen head bolts on mine and they really cracked when i broke them loose. next time i used 45 and blue loctite and they were much more cordial. i'd like to be there the day after you put them on with 75 lbs. and red loctite and watch you break them loose, or a year later. mine were 3/8 coarse thread. just something to think about.

patrickt 02-09-2010 03:57 PM
Quote:
Originally Posted by xlr8or (Post 1027185)
Patrick, the 8.8 doesn't use nuts. The bolts thread into the input flange on the diff.
Hmmm, must be the snow-blindness. I'm tempted to buy him a Jag IRS to make up for it.;)

Bernica 02-09-2010 05:08 PM
I just came from a place that is working on my Cobra this morning. They have a red '62-63 Corvette from Barrett-Jackson in there that the new Owner drove about 10 miles and the u-joints failed. Dropped the whole line while he was doing his first cruise. Mechanic said cheap bolts and elongated holes. Don't cheap out!!

patrickt 02-09-2010 05:21 PM
Quote:
Originally Posted by Bernica (Post 1027292)
I just came from a place that is working on my Cobra this morning. They have a red '62-63 Corvette from Barrett-Jackson in there that the new Owner drove about 10 miles and the u-joints failed. Dropped the whole line while he was doing his first cruise. Mechanic said cheap bolts and elongated holes. Don't cheap out!!
I have personally sheared off cheap u-joint bolts (NOT in my ERA Cobra, however). It sounds like a friggin' grenade has gone off in your car and it will absolutely scare the crap out of you. Your drive line is not the place to scrimp, either on U-joints or on the fasteners that hold them. And no, I did not have a drive shaft safety hoop when I blew them either.:eek:

Larry Ruppert 02-13-2010 09:44 PM
guys normal M12by1.75 metic bolts are made from 1541 material the N800594 ford part is made from higher grade 4037M material and is heat treated to 12.9 as indicated on the top of the head and should be torqued to the higher end of the spec. clean the pinion flange with a brush a gun barrel cleaning brush works good then rinse it out with brake cleaner. this will allow the loctite to set up


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