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A couple questions since I know these are a pain to pull apart. sure it's not a leaky wheel cylinder? Lubing the spindle so the seal isn't dry on install (that will burn the new seal right away) Bearings not loose and allowing the hub to wobble and break the seal? Is it leaking between the spindle and seal or the seal and hub (a gouge in the hub from pulling out an old seal will cause a leak, clean the scratch and a light smear of silicone helps this) If the spindle is rusty, gouged or grooved a speedy sleeve will fix that but not the other problems.
I had the same problem with perpetually leaking wheel seals, when i was swapping to rear discs I noticed that a previous owner capped the vent line. So when it got hot and pressure built the wheel seals were the weakest link.
93 D-250, NV4500 with US Gear overdrive (poor man's 10 speed), 3.73 Gears, Stock Injectors, 12cm turbo, Pump screw bottomed, 4" Exhaust, Rear Disc Brake Conversion, Denny T Fuel Pin, AFC spacer, Cable Shutdown Club. Unbranded Exhaust Brake
This really helped. I'd never heard of speedy sleves so I'll check into it. I do have grooves but of note, My axle vent was completely plugged up. It wasn't evident at first because the tube was fine. It was the tapped fitting into the tube that was plugged up airtight. Thanks for the help.
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