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monster
Imola


Joined: 04 Sep 2010
Posts: 785
Location: Bournemouth


PostPosted: Fri May 10, 2019 10:50 pm    Post subject: Reply with quote

Ive had my 997 getting for 10 years now and its been through two pumps in that time.

The first one corroded through the cover as per the more usual failure mode, but the second one corroded through the takeoff spigot for the brake servo assist vacuum. This manifested itself by a complete loss of servo assist for the brakes rendering the car with seriously impaired braking capability.

It took me a while to pinpoint the actual cause of the problem as it wasnt obvious were the actual leak was coming from.
 
  
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sja360
Trainee


Joined: 29 Apr 2007
Posts: 91
Location: Dundee

2007 Porsche 997 Carrera 4S

PostPosted: Fri May 10, 2019 11:08 pm    Post subject: Reply with quote

monster wrote:
Ive had my 997 getting for 10 years now and its been through two pumps in that time.

The first one corroded through the cover as per the more usual failure mode, but the second one corroded through the takeoff spigot for the brake servo assist vacuum. This manifested itself by a complete loss of servo assist for the brakes rendering the car with seriously impaired braking capability.

It took me a while to pinpoint the actual cause of the problem as it wasnt obvious were the actual leak was coming from.


Out of interest is your car garaged and used all year around?
 
  
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-- 997 --
Suzuka


Joined: 11 Jun 2015
Posts: 1201



PostPosted: Fri May 10, 2019 11:33 pm    Post subject: Reply with quote

Ok, interesting posts, so heres another question, to change the tandem pump what are the procedures, i.e. how is it tackled to take off? What needs to be stripped before the access the pump?

Cheers..

J
 
  
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monster
Imola


Joined: 04 Sep 2010
Posts: 785
Location: Bournemouth


PostPosted: Sat May 11, 2019 12:51 am    Post subject: Reply with quote

sja360 wrote:

Out of interest is your car garaged and used all year around?


Its garaged now but wasn't for the majority of those years and was used all year round.
 
  
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monster
Imola


Joined: 04 Sep 2010
Posts: 785
Location: Bournemouth


PostPosted: Sat May 11, 2019 12:56 am    Post subject: Reply with quote

-- 997 -- wrote:
Ok, interesting posts, so heres another question, to change the tandem pump what are the procedures, i.e. how is it tackled to take off? What needs to be stripped before the access the pump?

Cheers..

J


Just raise the rear of the car and its located on the rear of the engine on the offside. I think it's 4 bolts that hold it in place. There is also a length of aluminium tube that it is advisable to replace at the same which needs to come out through the space vacated by the air filter housing. Easy diy, just a bit fiddly to wiggle the aluminium pipe in and out.
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6981
Location: Brighton


PostPosted: Sat May 11, 2019 2:30 pm    Post subject: Reply with quote

All brake servos have a one way valve and its usually on the end of the pipe you actually push into the servo ... no check valve and on over run you would have no vacuum in the servo Smile

The Tandem pump replacement itself is not hard .. but if the bolts have seized they will just round out ( Torx ) .

In this case you have to remove the bumper and possibly the exhaust that's in front of it then being a bit brave start attacking around the bolts with a hammer and chisel to snap away the casing or try and drill them out .

i've used the hammer method a few times and its quite effective shall we say .
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darkhorse
Trainee


Joined: 24 Feb 2019
Posts: 82
Location: under the car


PostPosted: Sat May 11, 2019 4:57 pm    Post subject: Reply with quote

I replaced the cover with the ACP item and it worked perfectly. My tandem pump wasn't actually leaking but the cover was quite corroded in places. Had I realised the Pierberg full pump was £250 from autodoc I would have replaced the whole item!
Anyone got a link for this because I cant see one on the autodoc site
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6981
Location: Brighton


PostPosted: Sat May 11, 2019 5:58 pm    Post subject: Reply with quote

Cheapest i found ..

https://www.frazerpart.com/acatalog/Porsche-987-997-tandem-vacuum-pump.html?gclid=EAIaIQobChMI9o-8w4WU4gIVArTtCh2UlwemEAQYASABEgKEMfD_BwE

You will need the pipe that goes onto it as well though as these tend to corrode in and don't come out in one piece .

Turbos are different pumps though .
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timbo1811
Silverstone


Joined: 13 Dec 2016
Posts: 111
Location: Dorset


PostPosted: Sat May 11, 2019 6:39 pm    Post subject: Reply with quote

deMort, I'll see your Frazer part, and raise you an Autodoc........vat inc, free delivery and its OEM
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6981
Location: Brighton


PostPosted: Sat May 11, 2019 7:13 pm    Post subject: Reply with quote

https://www.autodoc.co.uk/pierburg/7890260

i always get confused by this , INC vat means it will be added ?

if so its £305 from autodoc Dont know

This is why i just fix cars and not do parts .. sigh ..
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jl-c
Monza


Joined: 22 Jul 2013
Posts: 160
Location: Shropshire


PostPosted: Sat May 11, 2019 7:20 pm    Post subject: Reply with quote

INC = including Smile
EX = excluding
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Porsche Carrera 2S 2005 black fully Hartech'd!, BMW Z4 coupé 2007 blue, Mazda Eunos 1996 yellow, VW Passat 2014 black.


We all do silly things/make mistakes, it's how we deal with them that sets us apart from animals and Americans.
 
  
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deMort
Long Beach


Joined: 21 Mar 2015
Posts: 6981
Location: Brighton


PostPosted: Sat May 11, 2019 7:38 pm    Post subject: Reply with quote

aghh thank you ...

Inclusive ..

including ..


sigh . i didnt know which .
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jl-c
Monza


Joined: 22 Jul 2013
Posts: 160
Location: Shropshire


PostPosted: Sat May 11, 2019 7:43 pm    Post subject: Reply with quote

no problem Smile I agree it can be confusing.
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Porsche Carrera 2S 2005 black fully Hartech'd!, BMW Z4 coupé 2007 blue, Mazda Eunos 1996 yellow, VW Passat 2014 black.


We all do silly things/make mistakes, it's how we deal with them that sets us apart from animals and Americans.
 
  
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Scholester
Suzuka


Joined: 16 Jan 2012
Posts: 1110
Location: South West


PostPosted: Sat May 11, 2019 10:15 pm    Post subject: Reply with quote

Turbos are different pumps though .[/quote]

This is the main reason why preventative steps/cover replacement should be carried out on the Turbo as replaments pumps are circa £1000
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RJKflyer
Montreal


Joined: 30 Aug 2011
Posts: 513



PostPosted: Sun May 12, 2019 12:08 pm    Post subject: Reply with quote

To support those comments regarding ACF50 - my 997.2 turbo is now 8 years old and there is no appreciable corrosion.
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