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Here is a pic of the front of my 22RE 2500 miles after a complete rebuild:


I haven't determined the exact cause, but the seal was brand new and shop installed during the block rebuild.


Its common for the crank pulley to get a groove worn into it from the seal and then a new seal won't fix a leak. A "speedy sleeve" will fix the groove on the pulley. Its just a thin steel sleeve that you slip on that provides a new seal surface. Available at NAPA, etc.

'97 4Runner, '06 F350, '86 4Runner, '05 WR450
http://home.4x4wire.com/erik