NTB an M8 hollowed screw for my supercharger pulley.
Thread Starter
MBWorld Fanatic!
Joined: Feb 2006
Posts: 6,213
Likes: 8
LET C32 2002
NTB an M8 hollowed screw for my supercharger pulley.
I changed the bearing for my SC pulley but following a youtube videos NM torque spec for an E55 I had my friend torque it to 60 NM/44 lbs it snapped off the problem is finding this screw its hollow not solid and I read this from CrossFire SRT6 forum
,"
Originally Posted by rcompart View Post
Dave, sorry to correct you but this isn't true. Yes the bolt is a strech bolt and like pretty much every bolt on a benz, it's advised to replace it after it's been installed and then removed. This really has no correlation on the bolt being hollow as every other stretch bolt is solid. What that hole is there for is to keep the gear case pressure in the supercharger housing from blowing out the seals as the temp raises and the oil and resulting air inside the gear case expands. This is why there is a distinct smell from the front of the supercharger. And for the low torque rating of the bolt, it has nothing to do with the changing the clearances of the bearing, it's simply so you don't snap off the new bolt you put in. The same bearing is used in crown forklifts and is torqued town to 100nm which is almost 75 ft-lbs. I'm going to ask MikeR if he would make 20 or so of these for the guys on here because this will continue to happen more and more as these cars find new owners.
With how fast you're spinning that supercharger and the added heat you're creating, you more than most need the hollow bolt."
So taking this to mind anyone knows where I can buy this M8 screw per mercedes spec? Also does anyone know the NM spec for a c32 for this pulley
,"
Originally Posted by rcompart View Post
Dave, sorry to correct you but this isn't true. Yes the bolt is a strech bolt and like pretty much every bolt on a benz, it's advised to replace it after it's been installed and then removed. This really has no correlation on the bolt being hollow as every other stretch bolt is solid. What that hole is there for is to keep the gear case pressure in the supercharger housing from blowing out the seals as the temp raises and the oil and resulting air inside the gear case expands. This is why there is a distinct smell from the front of the supercharger. And for the low torque rating of the bolt, it has nothing to do with the changing the clearances of the bearing, it's simply so you don't snap off the new bolt you put in. The same bearing is used in crown forklifts and is torqued town to 100nm which is almost 75 ft-lbs. I'm going to ask MikeR if he would make 20 or so of these for the guys on here because this will continue to happen more and more as these cars find new owners.
With how fast you're spinning that supercharger and the added heat you're creating, you more than most need the hollow bolt."
So taking this to mind anyone knows where I can buy this M8 screw per mercedes spec? Also does anyone know the NM spec for a c32 for this pulley
MBWorld Fanatic!
Joined: Mar 2004
Posts: 2,073
Likes: 27
From: North NJ
2002 C32 AMG, 2013 GLK 350/4, 2015 E63S AMG Wagon
Hi Vic,
Here is some info on the bolt.
http://www.needswings.com/supercharger-pulley-bolt
Torque should be 20nm and clutch clearance should be 0.25 - 0.30 mm
Here is some info on the bolt.
http://www.needswings.com/supercharger-pulley-bolt
Torque should be 20nm and clutch clearance should be 0.25 - 0.30 mm
Thread Starter
MBWorld Fanatic!
Joined: Feb 2006
Posts: 6,213
Likes: 8
LET C32 2002
Hi Vic,
Here is some info on the bolt.
http://www.needswings.com/supercharger-pulley-bolt
Torque should be 20nm and clutch clearance should be 0.25 - 0.30 mm
Here is some info on the bolt.
http://www.needswings.com/supercharger-pulley-bolt
Torque should be 20nm and clutch clearance should be 0.25 - 0.30 mm
