A place for more technical discussions. Please make sure you post in the correct section on the site, this way it keeps the site tidy AND ensures you get a more relevant answer.
Just replace it - if the fins are falling out you've lost cooling surface area, and run the risk of overheating the engine, and that's the last thing you want to have happen.
The new pulley is in place. [...]
The car is running well, even seems smoother.
A engine with a functioning harmonic balancer will run noticeably more smoothly than one with a failed h.b.
That bit of rubber in the centre of the crank pulley is actively performing a critical function when the engine is running, which is also why that bit of rubber tends to fail. Turning kinetic energy into heat energy thousands of times a minute is hard work.
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