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Re: Onomatopoeias - was: Source for lifters/valves?

>He says it's usually the vacuum pump - there is a rod inside that
>wears, and that is what produces the noise.  They don't usually
>fail he says, but just get louder and louder.

Do you happen to know what rod he is talking about?  Is it the rod that drives
the pump from the cam, or a rod internal to the vacuum pump?