Vacuum pump V70

[tomnorth]

I am the proud owner of a 1997 V70 with 231,000 miles on the clock.
the engine still runs sweet but, in the 5yrs I have owned the car, it has always had a noisy vacuum pump which is now getting noisier!
Has anyone tried replacing the mechanical pump with an electrical pump and if so what were the results?
Many thanks Tom

[Clan]

Originally Posted by tomnorth

I am the proud owner of a 1997 V70 with 231,000 miles on the clock.
the engine still runs sweet but, in the 5yrs I have owned the car, it has always had a noisy vacuum pump which is now getting noisier!
Has anyone tried replacing the mechanical pump with an electrical pump and if so what were the results?
Many thanks Tom

that is probably due to a vacuum leak,so the pump is working 100% load all the time . Try taking to pipe off the pipe and blocking it as see if the noise goes.

[tomnorth]

OK will check this.
What I should have said is that a couple of years ago I dismantled the vacuum pump and lubricated the piston ring. This radically reduced the noise but only for a while.
I am told these vacuum pumps are always noisy - is this true?

[Baffler]

Originally Posted by tomnorth

Has anyone tried replacing the mechanical pump with an electrical pump and if so what were the results?

Never heard of anyone doing so. Maybe ask on the VW T4 forum?

Originally Posted by tomnorth

I am told these vacuum pumps are always noisy - is this true?

Pretty much...especially as the old oil deposits build up in the series of one-way valves. With the engine running have you tried spraying a lubricant (3-In-One with PTFE) into the vacuum pump?

If the car is going well otherwise I would treat it to a new Pierburg pump and genuine VW or Volvo pushrod. They are pricey, yes, but remember these are constantly working off the camshaft.