Tom Hargrave wrote:
> The dangerous failure mode is when the internal drive roller mechanism fails
> and it takes the front surface of the IP timing mechanism with it. The
> Manufacturer designed an updated vacuum pump that solves the problem. I
> replaced mine at 250,000 miles and the original looked like new. But this is
> when you want to replace one, once the damage starts it's too late.

And it can also drop ball bearings into the timing chain.  :(

John


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