installing Dura-Ace 7800 Bottom Bracket
07-31-08 | 04:44 PM
#1
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From: Southern Ca
installing Dura-Ace 7800 Bottom Bracket
Got a few questions:
1. Should I put loctite anti-seize or grease on the two adapter threads?
2. Manual says I should tighten with my FC32 tool to 305-435 pounds. Do I need to get some sort of torque wrench adapter and somehow attach it to my FC32 tool? or can I tighten without the aid of a torque wrench?
3. Grease or anti seize on the two crank arm bolts?
Thanks
1. Should I put loctite anti-seize or grease on the two adapter threads?
2. Manual says I should tighten with my FC32 tool to 305-435 pounds. Do I need to get some sort of torque wrench adapter and somehow attach it to my FC32 tool? or can I tighten without the aid of a torque wrench?
3. Grease or anti seize on the two crank arm bolts?
Thanks
Last edited by OCRider2000; 07-31-08 at 04:51 PM.
07-31-08 | 08:02 PM
#2
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Joined: May 2004
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From: Wilmington, DE
Bikes: 2016 Hong Fu FM-079-F, 1984 Trek 660, 2005 Iron Horse Warrior Expert, 2009 Pedal Force CX1, 2016 Islabikes Beinn 20 (son's)
1. I would think that the bearing cups would have some sort of locking compound preapplied. If yours do, I wouldn't apply anything else. If not, I'd use grease or antisieze unless they creaked and only then try Loctite.
2. With a wrench style tool like the FC32, the best you can do is guess at the torque by hand. Figure out the distance from the centerline of the bearing cup cutout to where you'll be applying the force and then divide the torque spec by that number (the torque spec should be in in. lbs. so measure in inches). That will give you the force you need to apply at that distance to achieve the proper torque.
Just FYI, assuming you gave the correct numbers, the torque will be 305-435 in. * lbs. (25-36 ft. lbs.). Torque is always expressed as a distance times a force (or vice versa). Think of what you are doing when you apply a torque with a wrench and it'll make sense. Say you have an 8 inch distance from the centerline of the bearing cup to where you are applying the force. You'd need to apply 38-54 lbs. of force to the wrench.
3. Either should be fine.
2. With a wrench style tool like the FC32, the best you can do is guess at the torque by hand. Figure out the distance from the centerline of the bearing cup cutout to where you'll be applying the force and then divide the torque spec by that number (the torque spec should be in in. lbs. so measure in inches). That will give you the force you need to apply at that distance to achieve the proper torque.
Just FYI, assuming you gave the correct numbers, the torque will be 305-435 in. * lbs. (25-36 ft. lbs.). Torque is always expressed as a distance times a force (or vice versa). Think of what you are doing when you apply a torque with a wrench and it'll make sense. Say you have an 8 inch distance from the centerline of the bearing cup to where you are applying the force. You'd need to apply 38-54 lbs. of force to the wrench.
3. Either should be fine.
08-01-08 | 08:00 AM
#3
Thread Starter
Senior Member
Joined: Sep 2006
Posts: 424
Likes: 0
From: Southern Ca
1. I would think that the bearing cups would have some sort of locking compound preapplied. If yours do, I wouldn't apply anything else. If not, I'd use grease or antisieze unless they creaked and only then try Loctite.
2. With a wrench style tool like the FC32, the best you can do is guess at the torque by hand. Figure out the distance from the centerline of the bearing cup cutout to where you'll be applying the force and then divide the torque spec by that number (the torque spec should be in in. lbs. so measure in inches). That will give you the force you need to apply at that distance to achieve the proper torque.
Just FYI, assuming you gave the correct numbers, the torque will be 305-435 in. * lbs. (25-36 ft. lbs.). Torque is always expressed as a distance times a force (or vice versa). Think of what you are doing when you apply a torque with a wrench and it'll make sense. Say you have an 8 inch distance from the centerline of the bearing cup to where you are applying the force. You'd need to apply 38-54 lbs. of force to the wrench.
3. Either should be fine.
2. With a wrench style tool like the FC32, the best you can do is guess at the torque by hand. Figure out the distance from the centerline of the bearing cup cutout to where you'll be applying the force and then divide the torque spec by that number (the torque spec should be in in. lbs. so measure in inches). That will give you the force you need to apply at that distance to achieve the proper torque.
Just FYI, assuming you gave the correct numbers, the torque will be 305-435 in. * lbs. (25-36 ft. lbs.). Torque is always expressed as a distance times a force (or vice versa). Think of what you are doing when you apply a torque with a wrench and it'll make sense. Say you have an 8 inch distance from the centerline of the bearing cup to where you are applying the force. You'd need to apply 38-54 lbs. of force to the wrench.
3. Either should be fine.
