CDTI Undertray clips

[DaylightRovery]

Evening all.

My undertray is hanging down on my CDTI facelift contemporary. Half the clips are missing and as I dont have access to ramps it's a pain in the hoop to get the central 2 bolts/clips.

2 questions.

1. Is the undertray really that effective? has anyone took theirs off completely and the car suddenly rusted from bottom up??

2. I can find the clips on ebay for the front bumper. They're the long screws with what appears to be 1 incredibly course thread on the end. Are the 2 central screws the same as these?? as they completely missing and my undertray is hanging like a hammock!.

Cheers all.

[suzublu]

What you need matey https://www.dmgrs.co.uk/collections/...0050-kzm000050

[ceedy]

Sorry those are hopeless..;

Had some .too soft and just jam up .

And single slot
Well that's my experience .

[SD1too]

Hello Robert,

To answer your questions:

Originally Posted by DaylightRovery

1. Is the undertray really that effective?

Do you think that a car manufacturer would go to the trouble and expense of making and fitting a component that wasn't effective?

As I understand it, the undertray performs two functions:

• Aerodynamics. It smooths airflow under the car which the theory probably tells us improves roadholding.
• Protection. It stops rainwater splashing upwards causing corrosion and electrical faults.

Originally Posted by DaylightRovery

2. I can find the clips on ebay for the front bumper. They're the long screws with what appears to be 1 incredibly course thread on the end.

The best fittings are not found on e-bay. They are the genuine MG Rover Dzus fasteners. These are released with a 180˚ turn of a Posidriv bit. The spigot is retained on the undertray with a nylon washer. Omitting these washers is the main reason why the fasteners are lost and the undertray hanging down.

I have the OEM Dzus fasteners on my car. I don't agree that the parts offered by DMGRS are superior. They require many turns because they're effectively screws. Unless you have a 4 post lift, that isn't an advantage. A 180˚ twist wins every time.

Simon

[HarryM1BYT]

Originally Posted by SD1too

The best fittings are not found on e-bay. They are the genuine MG Rover Dzus fasteners. These are released with a 180˚ turn of a Posidriv bit. The spigot is retained on the undertray with a nylon washer. Omitting these washers is the main reason why the fasteners are lost and the undertray hanging down.

I managed to get some from ebay, which did work fine, they were just slotted instead of posidrive and bright plated, instead of black.

A couple of the spring nuts they screw into had failed on the sub-frame and they came complete with the nuts, so I replaced those two as well. They needed a bit of squeezing up, to get the nuts to properly stay put on the sub frame.

They do really need the plastic retaining washers to prevent fasteners getting lost. I made lots of them from a 4 pint plastic milk container, using a 25mm hole saw.

[suzublu]

Originally Posted by ceedy

Sorry those are hopeless..;

Had some .too soft and just jam up .

And single slot
Well that's my experience .

Originally Posted by SD1too

Hello Robert,

To answer your questions:

Do you think that a car manufacturer would go to the trouble and expense of making and fitting a component that wasn't effective?

As I understand it, the undertray performs two functions:

• Aerodynamics. It smooths airflow under the car which the theory probably tells us improves roadholding.
• Protection. It stops rainwater splashing upwards causing corrosion and electrical faults.

The best fittings are not found on e-bay. They are the genuine MG Rover Dzus fasteners. These are released with a 180˚ turn of a Posidriv bit. The spigot is retained on the undertray with a nylon washer. Omitting these washers is the main reason why the fasteners are lost and the undertray hanging down.

I have the OEM Dzus fasteners on my car. I don't agree that the parts offered by DMGRS are superior. They require many turns because they're effectively screws. Unless you have a 4 post lift, that isn't an advantage. A 180˚ twist wins every time.

Simon

Sorry chaps, can't comment on the quality of those linked, just wanted to give the OP an idea of what he needed
Personally, I have similar to these https://www.ebay.co.uk/itm/LANDROVER...cAAOSwux5YKbVA

[DaylightRovery]

Cheers people, the under tray will stay as I supoose I wanted my own thoughts confirmed.

Suzublu many thanks. I dont suppose you know weather the 2 central fasteners use the litle gripper bit of metal or do they screw straight into a thread on the underside of the car??

[roverbarmy]

My 2000 V6 has an immaculate engine compartment (always had the undertray). My previous 2005 car had no tray and a rusty underside and corrosion showing on the alloy parts of the engine underside (before I treated it!). The V6 engine noise is quieter than the 1.8 was!

[Pumpwater]

Originally Posted by DaylightRovery

I dont have access to ramps it's a pain in the hoop to get the central 2 bolts/clips.

I managed to get mine back on without ramps or even jacking it up & I am 72 & nowhere as nimble as I was

I fixed the four turnbuckles at the front first with the undertray resting on an shallow cardboard box, then I raised is a little bit more by putting a towel under the box then fitting the other six fasteners using a stubby screwdriver working from front to back. I could just reach each one by lying on a rug & reaching under the car

Mike

[HarryM1BYT]

Originally Posted by Pumpwater

I managed to get mine back on without ramps or even jacking it up & I am 72 & nowhere as nimble as I was

I fixed the four turnbuckles at the front first with the undertray resting on an shallow cardboard box, then I raised is a little bit more by putting a towel under the box then fitting the other six fasteners using a stubby screwdriver working from front to back. I could just reach each one by lying on a rug & reaching under the car

Mike

You must have awfully long arms