D5 (D5244T to 2005) Vacuum pump

[Yosser]

I fitted a replacement vacuum pump to my D5 today as I suspected the old one was shot.

There was one obvious visible difference between what was on the car and what I fitted, and I'm hoping that some of you who may have removed vacuum pumps before can tell me what is normal.

I don't have actual pics of the two pumps, but the one I fitted looked like this:



What was different on the one I removed was that the part indicated by the yellow arrow was free to fall off, but on the replacement it seemed able to move but unable to come apart (as per the pic).

Also, the part indicated by the red arrow was prominent on the replacement (as per the pic) but pushed much further into the pump which was removed from the car.

Both pumps had the same part number.

Any words of wisdom gratefully received.

[outnumbered]

I am on the phone doing this so not at the comp there is a picture that I posted with the vac pump striped down you should find it doing a search.
Mike

[Yosser]

Thanks Mike, I think you mean this pic:



Not quite sure what that tells me, but I think the pump that came off mine was a duffer.

I'll get a pic of it for comparison and hopefully that will make more sense!

[Yosser]

I just nipped out to the lockup to get a picture of my old pump, I'm pretty sure it's knackered.

See here how the central part is not proud:



The round drive piece just falls straight off:






A sharp pull actually released the centre part from the pump, it appears to have fracture marks around it and I'm fairly sure it shouldn't just come out like this:



I guess I answered my own question - my old pump was fubar.

[5cilinder]

The blue horizontal marking on the pre-last picture is the symptome of some serious heat developing
Make sure when you replace the "new" pump that the lubrication out of the valvecover is working and not blocked with sludge

[Yosser]

Thanks, I noticed that bluing but wasn't sure what to make of it.

Judging by the amount of oil that came out of (and is still coming out of) the old pump, I don't think there are any lubrication issues.

[jimsvolvo]

Hi Yosser.

What made you think your vacuum pump had gone?

I have had for ages a leaky rear engine mount. What a surprise!
That sorted and my turbo governor replaced following your other post still getting some turbo lag or surge as tho the actuator arm suddenly comes into play. VNT is free and easy.
With engine at idle and open vacuum, i.e engine pad hose disconected, i watch the control arm on the turbo when reconnecting the hose and it pulls back in about 1second. this is about the same turbo lag/surge time. I thought it might snap back or at least be quicker than 1 second! is my vac pump possiblly at fault? There are no leakes in the vacuum system now.
Any ideas much appreciated.
thanks

James

[Yosser]

Originally Posted by jimsvolvo

Hi Yosser.

What made you think your vacuum pump had gone?

I think what really suggested it was when I tried to test the vacuum with a gauge and wasn't getting the expected results.

Mike (Outnumbered) has a thread on here somewhere where he gives a decent amount of detail on what vac you should expect at what point in the system.

Basically, I disconnected the pipe from the small nipple on the vac pump and attached a gauge. The reading was all over the place, but never peaking at anything like the vacuum required by the system.

If you have a vac gauge then try it and see. You can probably tee into the pipework at a more convenient point than at the pump itself.

[jimsvolvo]

Thanks will see if i can find it.

The pipe you refer to when disconected gives a very small pft pft pft sound sounds like a fast ticking clock!

Will have to see if i can get a gauge!

Thanks
James

[outnumbered]

from the Vac pump you should be getting at least 25 hg,this feeds the Tcv that feeds the pipe, if you have a leaky mount that can effect the boost. it also feeds the Tcg this feeds the turbo.at the inport to the Tcg you should have at least 25 hg, on the outport you should have 25 at idle and when the throttle is applied the vac will decrease thus moving the vanes.
vac gauge is on the left.
https://www.youtube.com/watch?v=0Wn1eyo_FLY
hope that helps.
mike