73 Swinger, front single caliper discs.

I got my rotors turned today. Put it back together, the FSM (in the text under installing the rotor) says, tighten to 90 inch pounds, then back off one notch.

However, in the tightening reference tables, it states "wheel bearing nut 240-300 inch pounds".

Is this some sort of contradiction, or are they talking about two different nuts?

I did the 90 inch pounds and backed off one notch, seems like the right tension. Is this correct?

73-up discs should take the higher spec - 240-300 in-lbs. 90 is for the drums.

Lou

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Home of Slant6-powered fun machines since 1988

My understanding is that the high initial torque is to preload the bearings to take all of the "space' out of the assembly, and make sure you have squeezed the grease out from between the bearings and the race. Then you back off, and retighten by hand. My favorite final tighten is to re-tighten the nut just until you cannot push the washer sideways with a large screwdriver, and then find the next castle nut slot for the cotter key. Since you then loosen and re-tighten to the final tightness, I don;t think the exact torque for the pre-load is all that critical. I would think the difference might be attributed to a heavier grease used with disk brakes. Talk to ten different mechanics and you will hear ten different procedures with claims of good luck with them all. In the end, you don;t want play in the bearings like you could have with the older drum brake cars from the fifties. With those cars, a very, very slight bit of play was called for.

Sam

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