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  #51  
Old 10-03-16, 08:13
redpla redpla is offline
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Join Date: Apr 2015
Location: Pembrokeshire
Posts: 794
Default Re: 2.5 Vacuum Pump stripdown and fix.

Mine chirped. Few weeks later it began to screech at every cold startup.

Turned out to be a failing damper pulley. Łker-ching.
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  #52  
Old 10-03-16, 22:13
stew t4 stew t4 is offline
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Join Date: Apr 2011
Location: Dumbarton, Scotland
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Default Re: 2.5 Vacuum Pump stripdown and fix.

Thanks Redpla, I'll look into that I've never heard a screeching sound but I suppose their all different thanks again
Stew
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  #53  
Old 14-05-16, 12:18
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Bazza2009 Bazza2009 is offline
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Join Date: Jun 2009
Location: Newport
Posts: 238
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Well I've done this and now I have hardly any brakes?
I'm not sure all valves are in correct place though. Can anyone confirm if the plastic housing piece goes into the hole on right of the two and also where the tiny Spring should be located as when dismantling it all flew apart. Thanks in advance if anyone can give me the info.
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  #54  
Old 28-08-16, 21:44
tacochewy tacochewy is offline
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Join Date: Oct 2013
Location: Guildford
Posts: 33
Default Re: 2.5 Vacuum Pump stripdown and fix.

I've just done this fix on my vac pump (Pierburg pump on a 2.5tdi, 2002 ), I drained the oil form the pump and replaced the small piston rod seal with the blue one shown on the Spanish post.
I've just taken the van for a 3 miles run and the pump works much better now, with no tapping and also more vacuum
But I have noticed that now the pump gets really hot, after the run I could just about touch it, but it was close to burning me.

I didn't do the 'finger temperature test' before I fixed the pump and now I don't know if this is normal or not. I'm thinking that if the new oil seal prevents any oil entering the piston chamber then how does it get lubricated? I did smear some light oil around the piston before I reassembled but I'm not sure if this enough to keep it moving and greased.

Has anyone got any ideas on this, am I being paranoid or could the pump be overheating and then fail? Can someone please touch their pump,(ooh err) and let me know how hot it gets.

thanks
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  #55  
Old 31-08-16, 22:41
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Fatboy35 Fatboy35 is offline
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Join Date: Feb 2008
Location: Yeowvelle,Zomerzet
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Default Re: 2.5 Vacuum Pump stripdown and fix.

Just driven 90 miles at mixed speed, last 30 at 70mph, my vac pump is very hot, touch it and no burn but I wouldn't like to press my finger on it.

It is bolted to the block when all said and done, and that is hot too

Hope this helps

Chris

'There's a lot to be said for understatement'
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  #56  
Old 07-10-18, 23:02
pedalman pedalman is offline
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Join Date: Aug 2010
Location: North Cumbria
Posts: 369
Default Re: 2.5 Vacuum Pump stripdown and fix.

My van is my everyday vehicle , how many hours would this job take and how difficult is it to do ? I'm told it's pain to get at the bolts ......any tips ?
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