Back again with a seemingly ridiculous, but ongoing problem. On my 1978 Pinto with 52,000 original miles, I just installed the "correct" rear seals to replace the "incorrect" seals that leaked within two days of installation. I have installed many, some far more fragile, seals over the years so I really am not unfamiliar with all the needed care required to install them without damage. I know what happens if there is absolutely any distortion. Yes, the hard way! I also learned the difference between the very particular specs listed for the two different seals, each recommended for my application. Rear seal replacement should not be qualified as "brain surgery"!! However, mine are driving me crazy.
I initially replaced my rear seals with 3214 units per information given me by a seal mfg. Months later, when replacing the master cylinder and booster, I noticed both my NEW seals leaking all over. Since the time I had done that job I learned that although the number 3214 (National, Federal Mogul, etc.) seal is indicated to be the proper replacement, IT IS NOT!! According to dimensions, the inner diameter is listed around 1.3 inches... the true axle diameter at the contact point is 1.25 in. I also discovered that the CORRECT seal is number 3199, with a correct, 1.25 Inner diameter.
Has ANYBODY else encountered an ongoing problem sealing their axles? I inspected BOTH the seal surfaces, the housing and the bearings. All appears excellent, and at 52,000 there is no apparent wear in the bearings, which look, move and sound like new. Is there a superior seal recommended? Should it be necessary? Please let me know. Thanks!