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Dave, I thinks it is 19mm. I use a deep well 19 mm Craftsman 3/4" drive socket. I wrap the outer surface with black electrical tape to give it a little "padding" against the wheel as not to bang or chip anything. Works great.
The torque spec on the 991's 20" wheels is a staggering 118-119 ft.lbs. Very hard to break loose (but I have girly arms). So, I slip a piece of black pipe over my wrench (about 24 inches long) and they are now easy to get free.
I agree that I also think it's 19mm. Under no circumstances should you use the 3/4" and you should have a "deep" socket. The Torque wrench is mandatory to reinstall. It is very easy to mark up the studs with even the smallest incorrect measurement. The "specialized" sockets are even better.
It helps to put a little dab of anti-sieze compound on the threads. Not so much to prevent this happening, but because it makes everything turn so much easier and more consistently when tightening. One dab, one time, years and years of smoothness.
It helps to put a little dab of anti-sieze compound on the threads. Not so much to prevent this happening, but because it makes everything turn so much easier and more consistently when tightening. One dab, one time, years and years of smoothness.
This is horrible advice. Do not follow. The 118-119 ft.lb. torque spec is based on wheel bolts that are not lubed. Ignore this troll. He's never touched a 991.
This is horrible advice. Do not follow. The 118-119 ft.lb. torque spec is based on wheel bolts that are not lubed. Ignore this troll. He's never touched a 991.
Never put anti-seize or any kind of grease or WD-40 on lug screws, they are designed to install dry and torque values reflect that. Lubing the threads throws all that out the window. Where you use your anti-seize (and I do religiously) is where the wheel itself touches the hub. You have dissimilar metals on the alloy and the steel or iron mounting face of the hub, and they will tend to fuse together. Ever try to remove an alloy wheel that hasn't been off the hub in a couple of years? So you put your anti-seize at those contact points (liberally) and the wheels will always come off nice when you pull them off.
As to sockets, if you don't have proper sized tools, you have no business working on your car. That may sound harsh, but its true. All you will do is mangle your fasteners, and while you may not want to spend the money for tools they are a whole lot cheaper than new factory lugs. 5-point? Sawtooth? SAE on metrics? "Just step away from the car sir, before you injure it or yourself."
Last edited by drcollie; Jun 12, 2015 at 12:08 AM.
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