Elsawin states that it should be 20 N-m which is approximately 15 ft-lbs.
I also torqued mine to 20 N-m and it felt tight already. That 37 ft-lbs figure off myturbodiesel seems to be either an old figure or just plain wrong.
Honestly I don't know myself. Mine felt pretty tight at 20 and my wrench said I put 25 total.
For peace of mind I think you could open it up and do a quarter turn right just to be safe. To be doubly safe take it off totally and torque wrench it to the correct value. Just know that the bolt can only be retorqued a total of five times before you need a new one.
Thinking about it I gather if it wasn't tight enough it could eventually become loose with the turning of the wheel overtime and maybe one day the wheel comes out in your hand like in a cartoon?
Really sorry about the inconvenience. Didn't mean to give you the wrong info before.
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