Reuse pulley bolts, yay or nay?
#2
#3
Join Date: Jan 2011
Location: Haslet Texas
Posts: 21,008
Likes: 0
Received 4,361 Likes
on
1,953 Posts
#4
Depends on what bolts you have. If you have "normal" bolts they can be reused indefinitely with no problems. At some point Harley started using "Torque to yield" bolts and they can only be used once.
http://en.wikipedia.org/wiki/Torque-to-yield_fastener
http://en.wikipedia.org/wiki/Torque-to-yield_fastener
#5
I just looked in my SM, and it just says to clean 'em up, 2 drops of Red, and throw 'em back in service. Works for me.
#6
#8
The service manuals (including Twin Cam) that I have do not say replace these bolts, but I use new bolts any time I install a rear sprocket.
Some info about torquing and degreeing fasteners:
A torque to yield bolt would be torqued to a specified value, and then turned a certain amount of degrees, and the manual would specifically call out using new bolts.
Not all bolts that are torqued/degreed are torque to yield, there are many bolts that are torqued in this manner, and are reusable. We use these fasteners in the jet engine world for many applications.
But even though the factory manuals don`t call for replacement, practical experience tells us too many stories of these bolts failing when re used...
Some info about torquing and degreeing fasteners:
A torque to yield bolt would be torqued to a specified value, and then turned a certain amount of degrees, and the manual would specifically call out using new bolts.
Not all bolts that are torqued/degreed are torque to yield, there are many bolts that are torqued in this manner, and are reusable. We use these fasteners in the jet engine world for many applications.
But even though the factory manuals don`t call for replacement, practical experience tells us too many stories of these bolts failing when re used...
#10
Tq to yield in an aluminum wheel is more likely for the stretch of the component, not the bolt.. Cant say one way or another, but I have a hard time rationalizing a problem with reusing a pulley bolt when properly torqued with lock-tite.. If it were an issue, a publication from the guys who designed it (service manual or message) should be easy to find.. Interesting discussion though..