Hi and thanks for using 2CarPros.
It sounds like there is excessive end play in the crankshaft. Where it bolts in the block are main and thrust bearings. Especially with a manual transmission, the thrust bearings tend to wear faster. Every time you depress the clutch, you are pushing on the crankshaft (via the flywheel). If your vehicle has a clutch switch designed to prevent starter engagement without having the clutch depressed, then the pressure is there before the oil can make it to the bearings. This causes it to wear even faster.
Since you have replaced that many seals, I feel confident that if you were to pry in and out on the crank pulley, you would see too much end play. The result, it destroys the new seal.
Let me know if you have other questions or need help.
Take care,
Joe
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Monday, November 26th, 2018 AT 6:06 PM