C5 Hdi Undershield

jmd · Post by **jmd** » 05 Nov 2010, 18:25

How important is this under-shield, it is such a nuisance when carrying out an oil change. I try to keep things as the manufactured intended, but my son just rang me to say that his under-shield has partly fallen down on the road. Wondering if I should remove it all together. Has anybody decided not to replace theirs. I have driven my Xantia without it's undershield and had no adverse effects. Wondering about the C5

Post by **Paul-R** » 05 Nov 2010, 19:22

I don't know about the Xantia but on the C5 the undertray and the other plastic panels underneath tie together and give each other strength.

There is a post somewhere here from someone who lost part of one of his plastich wheelarch liners as a result.

JohnD · Post by **JohnD** » 05 Nov 2010, 19:37

My advice would be to keep it. When I had my Xantia I left the undertray off over winter after doing an oil change. By the spring, one wheel arch liner had flapped about so much that it was broken. The undertray keeps everything in it's place.

Citroenmad · Post by **Citroenmad** » 05 Nov 2010, 21:27

On the C5 the undertray holds the wheel arch liners in place and secure. Without it fitted the wheel arch liners usually touch the wheel and break or just come off, never to be seen again. Cars must have wheel arch liners.

Its there for other reasons, engine cooling, protectiong, etc. So its best to have it there.

It is a fiddle to remove on the C5, and i often hear a pin or two ping down the underside of the car when ive had mine off. So mine is now mostly screwed on now.

cachaciero · Post by **cachaciero** » 05 Nov 2010, 21:31

Simple solution, get a vacuum oil extractor pipe goes down dipstick hole no need to remove under tray

cachaciero

Citroenmad · Post by **Citroenmad** » 05 Nov 2010, 21:57

cachaciero wrote:Simple solution, get a vacuum oil extractor pipe goes down dipstick hole no need to remove under tray

cachaciero

I have one, but the oil filter on the 8v HDi is a metal canister type on the fron of the engine. Removing that without the undertray removed would make a nice mess. So i never use it on the C5.

cachaciero · Post by **cachaciero** » 06 Nov 2010, 00:18

Citroenmad wrote:
cachaciero wrote:Simple solution, get a vacuum oil extractor pipe goes down dipstick hole no need to remove under tray

cachaciero
I have one, but the oil filter on the 8v HDi is a metal canister type on the fron of the engine. Removing that without the undertray removed would make a nice mess. So i never use it on the C5.

Do you mean a bowl into which a filter element is placed? didn't think that kind of filter had been fitted on any car since Methuselah

Mind I reckon a bit of oil flowing back from the engine and painting the underside is a good way of keeping the metal moth at bay.

cachaciero

Post by **Paul-R** » 06 Nov 2010, 11:04

Maybe the 2.2 has a different filter and position to the 2.0 but I know that when I take the filter off my 2.0 I need the undertray off so that I can make sure I wipe as much oil as possible off the engine block, A/C compressor and pipes.

jmd · Post by **jmd** » 06 Nov 2010, 11:51

Thanks to everyone for the advice. It seems that I had better source a new under-tray. Thanks cachaciero, but I have used the vacuum tube on 3 cars. On the Xantia & C5 I found at least 1.5 to 2 Pts of oil were left behind in the sump. On our Saxo (only) the oil has been always totally & completely drained, using the extractor. So naturally I have reservations about vacuum extractors.

Post by **myglaren** » 06 Nov 2010, 13:49

Paul-R wrote:I don't know about the Xantia but on the C5 the undertray and the other plastic panels underneath tie together and give each other strength.

There is a post somewhere here from someone who lost part of one of his plastich wheelarch liners as a result.

That was mine - the wheel arch liner exploded at 90mph

Still haven't done anything about it and the undertray is still in the garden. Doesn't appear to be sprouting a new wheel arch liner though.
Mine was held on with zip-ties.

Clogzz · Post by **Clogzz** » 06 Nov 2010, 15:11

Previous undertray topic:
http://www.frenchcarforum.co.uk/forum/v ... hp?t=30697

A square can be cut out of the under shield to reach the sump plug.
On the 4-cylinder petrol car, the oil filter can be changed from the top, with newspaper on the shield to catch the spill.

JohnD · Post by **JohnD** » 06 Nov 2010, 15:20

jmd wrote: So naturally I have reservations about vacuum extractors.

And so do Citroen - especially on 1.6 engines.

Citroën sent this to dealers:-

OIL CHANGE PROCEDURE
It is necessary to follow a specific oil change procedure on all DV6 and DV6U engines so as to ensure that no used oil remains to mix with the new oil.

The following method must be used:

• The engine oil temperature must be at least 50°C :
- the engine oil temperature is considered to be at 50°C when the water temperature indicator is between 80°C and 90°C or the cooling fan has cut in
• ensure that the vehicle is level (side to side and fore and aft)
• remove the oil filter to allow the circuit to drain completely
• remove the oil filler cap and the dipstick
• remove the drain plug
• allow the oil to drain by gravity for at least 10 minutes (DO NOT USE SUCTION METHODS)
• fit a new oil filter
• refit the drain plug with a new sealing washer
• fill the engine with quantity of oil recommended for the engine
• refit the oil filler cap and the dipstick
• run the engine at idle until the oil pressure warning lamp goes out (about 1 minute)
• wait 5 minutes
• check the oil level using the dipstick: the level should be as close as possible to, but not exceeding the maximum mark (1) so as to be between (1) and (3)

These instructions were published to combat the alarming failure rate of turbos.

Post by **Paul-R** » 06 Nov 2010, 16:04

myglaren wrote:That was mine - the wheel arch liner exploded at 90mph

When driving in Germany no doubt.

Post by **myglaren** » 06 Nov 2010, 16:51

Paul-R wrote:
myglaren wrote:That was mine - the wheel arch liner exploded at 90mph
When driving in Germany no doubt.

Naturally - that's why my display is in German

Citroenmad · Post by **Citroenmad** » 07 Nov 2010, 21:11

I think the 2.2s have the paper filter element which is replaced, where as the 2.0s have the old style metal cylinder filter. 16v HDis have the newer style paper filter.