31-08-2020, 04:24 PM
Stuart's comments are useful. I would add that lapping hubs onto shafts is not without pitfalls: when either component has been lapped repeatedly you can reach a situation where the pinion on the inner end pulls hard against the inside of the differential, adding swarf to the lubricant. If you are going to lap this taper be very sure that both components have enough material on them to allow for the reduction. Personally I rely on both components having a good taper, and never do more than clean off any high spots with a small fine file; then I do up the hub nut properly. This needs doing repeatedly after each of the next short journeys until the nut does not pull up any further. I do not do the lapping process, and after proper tightening the hubs do not work loose. When tightening hub nuts I place a very short piece of 35mm stainless tube over the hub thread, after splitting it to allow this. Its length should fully cover the thread to avoid damage from whatever large spanner you may use to tighten the nut. Personally I have a large ring spanner and tighten enough pulling upwards to lift the relevant corner of the car.