XJR6 Lower supercharger pulley bolt specs and torque
#1
![Question](https://www.jaguarforums.com/forum/images/icons/icon5.gif)
For the life of me I can't find a diagram or part numbers for the lower supercharger crankshaft driven pulley and it's four bolts on Jaguar Classic Parts.
Does anyone know the four bolt part numbers, and specs?
Also any idea of the assembly torque value of the four bolts that mount the pulley?
.
Does anyone know the four bolt part numbers, and specs?
Also any idea of the assembly torque value of the four bolts that mount the pulley?
.
#2
#3
![Default](/forum/images/icons/icon1.gif)
Do they look like this flange bolt m8x50
non numbered part in page 40 of the spare part fiche, attached
I really could not find the tightening torque spec for those on the service manual, only helpfull notice to tighten them when replacing the pulley (attached also)
non numbered part in page 40 of the spare part fiche, attached
I really could not find the tightening torque spec for those on the service manual, only helpfull notice to tighten them when replacing the pulley (attached also)
The following users liked this post:
al_roethlisberger (07-09-2017)
#4
![Thumbs up](https://www.jaguarforums.com/forum/images/icons/icon14.gif)
Do they look like this flange bolt m8x50
non numbered part in page 40 of the spare part fiche, attached
I really could not find the tightening torque spec for those on the service manual, only helpfull notice to tighten them when replacing the pulley (attached also)
non numbered part in page 40 of the spare part fiche, attached
I really could not find the tightening torque spec for those on the service manual, only helpfull notice to tighten them when replacing the pulley (attached also)
I don't have the bolts in-hand, so I can't confirm the size, but thanks for the information! The bolts are numbered in the diagram you attached, so I would hope that means the torque is noted somewhere. We would think the folks writing these manuals would go ahead and list things like torque values in the same sentence as they say "tighten the SC pulley bolt"
![Roll Eyes (Sarcastic)](https://www.jaguarforums.com/forum/images/smilies/rolleyes.gif)
I'm hoping that Jagboi64's kit from Powerhouse UK may include the torque values in the instructions:
https://www.jaguarforums.com/forum/x...pulley-179050/
.
Last edited by al_roethlisberger; 07-09-2017 at 11:14 AM.
#5
![Default](/forum/images/icons/icon1.gif)
I think you can reuse the original bolts, the instructions say to use loctite 243, and torque to Jaguar specification. Usual spec for a grade 8.8 bolt is 14-16 ft-lbs. If it was a class 10.9 bolt (which I don't think it is) torque would be 20-22 ft-lbs.
Loctite 243 is blue threadlocker, the normal grade is 242, 243 is slightly stronger to resist oily bolts.
Loctite 243 is blue threadlocker, the normal grade is 242, 243 is slightly stronger to resist oily bolts.
The following 2 users liked this post by Jagboi64:
al_roethlisberger (07-09-2017),
someguywithajag (05-05-2021)
#6
![Default](/forum/images/icons/icon1.gif)
I think you can reuse the original bolts, the instructions say to use loctite 243, and torque to Jaguar specification. Usual spec for a grade 8.8 bolt is 14-16 ft-lbs. If it was a class 10.9 bolt (which I don't think it is) torque would be 20-22 ft-lbs.
Loctite 243 is blue threadlocker, the normal grade is 242, 243 is slightly stronger to resist oily bolts.
Loctite 243 is blue threadlocker, the normal grade is 242, 243 is slightly stronger to resist oily bolts.
Now that winter is coming, I may look at installing the new pulley, but want to verify the bolt specs before taking things apart.
.
#7
![Default](/forum/images/icons/icon1.gif)
Maybe it's in here about 8 pages down . The other factor in final torque other the the metallurgical properties of the bolt is that of the material of the item threaded into and the number of threads engaged . Might consider to have a visual indication if the bolts are migrating out in service is to use some things in the aircraft industry . Otherwise some bolt torque values you may receive may come from various forms of some mechanical engineering handbooks . Safety wire the bolts or use bend over locking tabs used in jet engines although you will lose a thread of engagement and the shank surface will move a bit out of the area of engagement .
Last edited by Lady Penelope; 11-23-2017 at 10:07 PM.
Trending Topics
#8
#9
The following users liked this post:
al_roethlisberger (11-25-2017)