Originally Posted by
Marcus_Ti
Crank bolts need tightened to torque spec. Typically something on the order of 35-40Nm IIRC. Get out or buy a torque wrench if you don't have one--crank bolts are one of those things Shade Tree Mechanics tend not to tighten enough. Make sure you're tightening the crank bolt and not a dust cover.
https://www.parktool.com/blog/repair...icle-section-4
Excellent advice. Or you can do it the old-fashioned way: Use the Campagnolo crank bolt wrench (the famous "peanut butter wrench") or a similarly-sized alternative like the average 3/8" drive socket wrench, and use moderate to heavy force to torque the bolts.
The reason the Campagnolo wrench is the size it is, is that it is relatively easy for the average
ragazzo to torque the bolts correctly, and rather more difficult to overtorque them. Use anti-seize or at least grease on the bolt threads, and goop a little on the bottom of the bolt head where it contacts the washer too. (At the risk of starting a religious war, don't grease the tapers. Campagnolo lore says no.)