Flywheel Bolts
#1
Senior Member
Thread Starter
Flywheel Bolts
I see many mentions that the flywheel bolts to the crank are torque to yield but is there an actual source for this information?
The bolts are grade 10.9. I ran some calculations and determined the torque spec of 53 N-m is well under the torque needed to yield the bolt (84 N-m).
Just want to clarify since these bolts are $10 a pop at my dealer.
The bolts are grade 10.9. I ran some calculations and determined the torque spec of 53 N-m is well under the torque needed to yield the bolt (84 N-m).
Just want to clarify since these bolts are $10 a pop at my dealer.
#4
Senior Member
iTrader: (3)
I'm going to go out on a limb and say it's due to the heads on them. A standard bolt has a lot of strength in the head. The flywheel bolts we use have such a thin head on them that I'm guessing your taking a chance on snapping them off. They aren't like a rod bolt that's torqued to a stretch length. Heads are super thin due to clearance.