Welcome to 911UK
The only place for Porsche, 911uk is the definitive enthusiast and resource site for the Porsche 911.
Registration is fast, simple and absolutely free, so join up today for full access to the site and benefit from latest member offers.

Porsche Classifieds
Sell Your Porsche on 911uk
Create a Free Classified Advert
Search Ads
Classified Adverts FAQ
Trade Classified Information
Buyer & Seller Fraud Protection
Consumer Rights Act
Pre Purchase Inspection (PPI)
Porsche Car Sourcing
Porsche Cars Wanted
Official Porsche Centre Reviews
Model
Stock
Porsche 911
992 : 2019- 0
991 : 2011- 25
997 : 2004- 57
996 : 1997-2005 31
993 : 1993-1998 2
964 : 1989-1993 0
Carrera 3.2 : 1983-1989 2
Carrera SC : 1977-1983 3
930 Turbo : 1975-1989 1
Early 911 : 1964-1977 1
Porsche Other Models
Classic : 1950-1965 0
Boxster : 1997- 27
Cayman : 2005- 22
Cayenne : 2003- 7
Macan : 2014- 5
Panamera : 2009- 0
912-914-924-928-944-968 0
959 - CarreraGT - RaceCar 0
Car Parts For Sale & Wanted
Other Items For Sale & Wanted
Wheels Tyres For Sale & Wanted
Number Plates For Sale Wanted

Porsche Services
Porsche Body Shop Repair
Paint Protection & Wrapping
Porsche Classic Insurance
Porsche Classic Parts
Porsche Classic Restoration
Porsche Design Collection
Porsche Engine Gearbox Rebuild
Porsche Heritage & History
Porsche News
Porsche Picture Gallery
Win a New Porsche 911

Porsche Parts
Body Parts, Body Styling
Brakes, Clearance
Electrical, Exhausts
Engine Cooling, Engine Electrical
Engine Rebuild, Heating Cooling
Interior Incar, Lighting
Rubber Seals, Service Parts
Steering, Suspension
Transmission, Workshop Tools
Early 911, 911 - 930, 928 - 968
964 - 993, 996 - 997, Boxster
Cayman, Cayenne, Panamera

Porsche Model Range
911 [992] 2018-Current
Porsche 911 [992]
911 [991] 2011-2019
Porsche 911 [991]
911 [997] 2004-2012
Porsche 911 [997]
911 [GT] GT1-GT2-GT3
Porsche 911 [GT]
911 [996] 1997-2005
Porsche 911 [996]
911 [993] 1993-1998
Porsche 911 [993]
911 [RS] RS-RSR
Porsche 911 [RS]
911 [964] 1989-1993
Porsche 911 [964]
911 3.2 1983-1989
Porsche 911 3.2 Carrera
911 SC 1977-1983
Porsche 911 SC
911 [Early] 1964-1977
Porsche 911 [Early]
Boxster & Cayman
Porsche Boxster & Cayman
Cayenne & Panamera
Porsche Cayenne & Panamera

911uk Site Partners

Post new topic   Reply to topic
Author Message
drmark
Monza


Joined: 07 Feb 2009
Posts: 164



PostPosted: Tue Jan 28, 2020 2:49 pm    Post subject: Advice on removing under trays please UPDATE Reply with quote

After reading couple of threads on here I have decided to have another (proper) look at the underside of our 12 year old 997. I have had the wheel arch liners out before, but now have the car up on axle stands and plan to take everything off.
The belly pans look to be held on by (corroded) bolts - are they are major pain to get off?
Are there any tips on where to start to make it easier?
Plan is to jet wash the underside once plastic is off. Clean up and then wire brush and rust treat any trouble spots, and then cover the whole thing in Bilt Hamber UC.
I will check the rear drains too (it's a cab).
Any comments / advice gratefully received (I am ham fisted).
I will take pictures as I go if anyone is interested.

PS the car is on four good axle stands with wheels under each corner should the worst happen. Safety first Wink

Last edited by drmark on Sat Feb 01, 2020 4:51 pm; edited 1 time in total
 
  
View user's profile Send private message
   
Gazc2
Watkins Glen


Joined: 08 Nov 2003
Posts: 2134
Location: Perthshire


PostPosted: Tue Jan 28, 2020 3:30 pm    Post subject: Reply with quote

The majority of the fixings are self tappers and should come out without a problem the clip that they screw into will most probably be pretty rusty

Speednut 91242501 £0.39 + vat from OPC someone mentioned you can also get them from Wurth.

The rest is held on with a plastic nut on a stud just be gentle with them and all should be ok.
_________________
2007 997 Turbo & 924s Restored
1990 964 C2
1989 3.2 targa
1987 3.2 Cab
1986 3.3 Turbo
1986 944 2.5 (later fitted with a 2.7 after wife went scuba diving in a flood and popped a piston through the block)
 
  
View user's profile Send private message Send e-mail
   
drmark
Monza


Joined: 07 Feb 2009
Posts: 164



PostPosted: Tue Jan 28, 2020 3:32 pm    Post subject: Reply with quote

Thank you Thumb
 
  
View user's profile Send private message
   
Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7587
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Tue Jan 28, 2020 4:19 pm    Post subject: Reply with quote

Sounds a useful project... please do post up how you get on.

I imagine it would be a hard job to do without lifting the car quite high up.
_________________
"911- the guilt-free supercar"

Current: 2003 C4S Coupe, seal/black

Ex: '02 C4S Coupe, '96 993 Targa, '88 Carrera Sport Coupe
 
  
View user's profile Send private message Send e-mail
   
drmark
Monza


Joined: 07 Feb 2009
Posts: 164



PostPosted: Tue Jan 28, 2020 4:23 pm    Post subject: Reply with quote

Robertb wrote:
Sounds a useful project... please do post up how you get on.

I imagine it would be a hard job to do without lifting the car quite high up.


I am going to have to breathe in - and put may reading specs on Wink
 
  
View user's profile Send private message
   
Stoddy
Monza


Joined: 13 Sep 2019
Posts: 229
Location: Wye Valley


PostPosted: Tue Jan 28, 2020 10:42 pm    Post subject: Reply with quote

Deffo post some pics please, I’m going to do this to my car too!

Best of luck!

thumbsup
_________________
The world is flat
2005 997.1 3.6 (Rufus -THE DUKE)
2002 996 3.6 C2 (Henry) For sale.


Restoring THE COLONEL, 1973 914.
X 944 S2 Cab (Miller)
X 3.2 Carrera (Gordon)
X 3.4 Cayman (George)
 
  
View user's profile Send private message
   
Johnd52
Montreal


Joined: 06 Oct 2014
Posts: 623
Location: North Yorkshire

2011 Porsche Cayman 987

PostPosted: Tue Jan 28, 2020 10:58 pm    Post subject: Reply with quote

You may find pressure washing is overkill for most of the hidden areas. I was more successful with the bucket and sponge/micro cloth, just working steadily from front to back. I then sprayed ACF 50 on as it gets in all the cracks and is safe for everything (except brake discs!)

The studs can corrode and snap off, but a soaking with penetrating fluid and gentle pressure should see them off ok.

A very satisfying job, even though only you will know it has been done.
_________________
2015 Cayman GTS. No more PDK but still red.
 
  
View user's profile Send private message
   
C11BRA
Imola


Joined: 30 Mar 2015
Posts: 751
Location: North London. Herts.


PostPosted: Fri Jan 31, 2020 12:30 am    Post subject: Reply with quote

Can’t wait to do mine too. Probably in the summer when my mates garage has a ramp free for a few days.
_________________
2006 997.1. Project GT3C. C stands for ???
2018 Audi A4 Avant Black Edition.
Ex 996 C2 Man.
Ex Ram Cobra V8.
Ex Series 1 RS Turbo.

 
  
View user's profile Send private message
   
wasz
Paul Ricard


Joined: 28 Dec 2012
Posts: 3067


1999 Porsche 996 Carrera 2

PostPosted: Fri Jan 31, 2020 8:10 am    Post subject: Reply with quote

You'll probably find it's clean under the Undertrays, aside from the brake pipes slowly rotting in silence.

I'd remove any sill end covers and clean them out, maybe cavity wax the sills and any other cavities while the Undertrays are off

Oh and waxoil or similar the brake pipes if they are ok, unclip them and get it in around any clips
_________________
996 parts cache sell off


My special order MY99 Vesuvious Charcoal 996 | Clutch, Fly RMS IMS AOS Job |
Steering Rack Hard Lines | Air Con Compressor / System
 
  
View user's profile Send private message
   
drmark
Monza


Joined: 07 Feb 2009
Posts: 164



PostPosted: Sat Feb 01, 2020 4:18 pm    Post subject: Update Reply with quote

Thanks for all the tips. Plastic is all off and I am astonished at how good the underside is. Only two parts are corroded (fixings aside) and it is just some superficial rust on thediagonal braces that run back from just in from of the rear wheels. Even the brake pipes look like new.

I knackered a few of the plastic bolts and all the clips are corroded. My OPC sent me a full pack of replacement clips, self tappers and plastic nuts for £20 inc postage.

I have treated and sprayed the braces. Used Dynax S-50 in the sills, and covered the underside and arches in Dynax UC (clear).

One problem I did discover is that both rear drains (it's a cab) were blocked so I had a lucky escape there.

Was it worth the effort? Probably not as the car looked good for another decade without my help. But it was very satisfying and kept me out of the pub. I won't be doing it again though.

I am puzzled as to why some cars on here have had bills for 2- 3k for the work (because of corrosion). Our car has done 54k and is 11 years old and doesn't get washed that often (monthly) and is used all year around. Perhaps I have just been lucky - or they have been very unlucky. The quality of the rust protection on mine appears top grade - as you would expect. Now to the pub.
 
  
View user's profile Send private message
   
deMort
Dijon


Joined: 21 Mar 2015
Posts: 7835
Location: Brighton


PostPosted: Sat Feb 01, 2020 7:21 pm    Post subject: Reply with quote

I don't often see rust on these cars .. a bit of surface here and there but that's about it .

Rear drains blocked and you just saved yourself a fortune .. trust me .. you have !

Remove the rubber disc behind the arch liner .

I have to say .. my hat off to you for removing the undertrays whilst on stands .. not an easy job when working that close to the panels.

Just reading this makes me glad i use a ramp Very Happy


Btw .. a car near a coast .. i know as i live near one will suffer far more than one inland .. salt air !
_________________
.
My Daughter's Crowdfunding has hit the target .

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

7pm - 9pm

Indy Mechanic .
 
  
View user's profile Send private message
   
drmark
Monza


Joined: 07 Feb 2009
Posts: 164



PostPosted: Sat Feb 01, 2020 7:46 pm    Post subject: Reply with quote

deMort wrote:
I don't often see rust on these cars .. a bit of surface here and there but that's about it .

Rear drains blocked and you just saved yourself a fortune .. trust me .. you have !

Remove the rubber disc behind the arch liner .

I have to say .. my hat off to you for removing the undertrays whilst on stands .. not an easy job when working that close to the panels.

Just reading this makes me glad i use a ramp Very Happy


Btw .. a car near a coast .. i know as i live near one will suffer far more than one inland .. salt air !


Thanks. Not easy on jack stands! Why is the rubber diaphragm there? Happy to remove if you advise.
 
  
View user's profile Send private message
   
deMort
Dijon


Joined: 21 Mar 2015
Posts: 7835
Location: Brighton


PostPosted: Sat Feb 01, 2020 8:21 pm    Post subject: Reply with quote

Porsche don't explain these things to us .. many training courses but we are still left to figure out on our own how some things work and what the reason is for others ..

My guess which is the same for the stupid drain bungs next to the battery is to stop rodent ingress to the car ... pointless as they find other ways in .

The rubber disc merely holds leaves , pine leaves etc and slows the water exiting the car from this area ..

I can say for a fact that the drains can only just about compensate for a large downpour of rain if totally clear .. i've sat in a stripped out car and watched in a car wash as these almost fill to the brim ..

The slightest obstruction and it will overflow ...

At first under the rear seat base then into the carpet area and under the seats .. control units there and you're in trouble basically .

Either way .. remove that rubber disc Wink
_________________
.
My Daughter's Crowdfunding has hit the target .

Thank you all so Very much .

She's not going until july 2020 though .



Mechanic

7pm - 9pm

Indy Mechanic .
 
  
View user's profile Send private message
   
drmark
Monza


Joined: 07 Feb 2009
Posts: 164



PostPosted: Sat Feb 01, 2020 10:37 pm    Post subject: Reply with quote

Will do. My guess is road noise rather than rodents, but either way they are gone.
 
  
View user's profile Send private message
   
drmark
Monza


Joined: 07 Feb 2009
Posts: 164



PostPosted: Sun Feb 02, 2020 12:02 pm    Post subject: Reply with quote

Last update Smile

Just checked front drains - the 4 rubber plugs either side of the battery - and they were blocked too. Please check yours.
 
  
View user's profile Send private message
   
Display posts from previous:   
Post new topic   Reply to topic   All times are GMT - 12 Hours
Page 1 of 1

 
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You can attach files in this forum
You can download files in this forum
You cannot post calendar events in this forum