Injector O Ring dimensions

[Juddder]

Anyone know the dimensions of the O Rings for the Ford Scorpion / Granada Bosch injectors that the Cerbera uses off the top of their head?

I ordered these ones from eBay but as you can see from the photo below they are 'a little' large (at 44.17 x 1.78MM)!



I think they should look like the ones in this picture



Many thanks in advance!

[CerbWill]

I've been using some 15mm diameter ones for a Rover V8 from mrinjector on eBay. No leaks in well over a year, bit of a pain to get the injectors back in but I'd rather that than a leak.

[tofts]

7x15x3.75

Can buy 100 of them from fleabay for about £8

I have quite a few now.....

[ukkid35]

Injector seals

Nitrile 70 Rubber O-Rings 3.5mm Diameter C/S Sizes 7mm ID - £3.95 inc P&P for pack of 25

http://stores.ebay.co.uk/sealforceoringandsealsolu...

[ukkid35]

Juddder said:

Anyone know the dimensions of the O Rings for the Ford Scorpion / Granada Bosch injectors that the Cerbera uses off the top of their head?

I ordered these ones from eBay but as you can see from the photo below they are 'a little' large (at 44.17 x 1.78MM)!

I think you'll find those are the air intake O rings.

[Jhonno]

ukkid35 said:

Juddder said:

Anyone know the dimensions of the O Rings for the Ford Scorpion / Granada Bosch injectors that the Cerbera uses off the top of their head?

I ordered these ones from eBay but as you can see from the photo below they are 'a little' large (at 44.17 x 1.78MM)!

I think you'll find those are the air intake O rings.

They are yes..

[rev-erend]

Take off one of the old o rings and measure it.

It will more than likely be either 14.5mm or 15mm.

[Juddder]

ukkid35 said:

I think you'll find those are the air intake O rings.

Thanks for the replies

The air intake O rings were recommended to me to use for refitting the throttles to ensure a leak free seal to the cylinder head.

Annoyingly I've just put them in the post box to return them, thinking they were the ones for the injectors, so I'll need to go and buy them again!

Thanks for the advice on the Injector O Rings - the nearest they had is 7 x 3mm which gives

Inside Diameter (S): 7mm
Outside Diameter (D): 13mm
Section (S): 3mm
Material: Nitrile
Shore Hardness: 70

[update]

They also had 4mm section ones at bearingshopuk so I've ordered those too

That gives an outside diameter of 15mm

Inside Diameter (S): 7mm
Outside Diameter (D): 15mm
Section (S): 4mm
Material: Nitrile
Shore Hardness: 70

Edited by Juddder on Wednesday 4th May 15:27

[Mr Cerbera]

Juddder said:

....they had is 7 x 3mm which gives

Inside Diameter (S): 7mm
Outside Diameter (D): 13mm
Section (S): 3mm
Material: Nitrile
Shore Hardness: 70

They also had 4mm section ones at bearingshopuk so I've ordered those too

That gives an outside diameter of 15mm

Inside Diameter (S): 7mm
Outside Diameter (D): 15mm
Section (S): 4mm
Material: Nitrile
Shore Hardness: 70

Hi Alex

Did you get the job done and can you recommend which of the fittings worked best ?

Ta !

Paul

[Quroll]

I would chose rings made of Fluorocarbon, Viton. They are more expensive, yes, but more resistant against heat and chemicals and they don’t age.

[Mr Cerbera]

I am astounded by the amount of info there is out there in WebWorld on O rings, Quroll
BUT
I think that your motor would have suffered catastrophic failure on other fronts before your nitrile O rings would suffer



BUT

It does worry the crap out of me about the material the manufacturers use in Brake Caliper O ring seals.
I tested mine after a few laps of Spa a few years ago and the discs were 570 Deg C

Edited by Mr Cerbera on Friday 20th May 15:35

[Quroll]

The temperature resistance is just one of the attributes I mentioned. The more important one is the not existing deterioration (hope I took the right translation). The seals will keep their flexibility over the life time in comparison to other rubber materials.

[Mr Cerbera]

Quroll said:

The temperature resistance is just one of the attributes I mentioned. The more important one is the not existing deterioration (hope I took the right translation). The seals will keep their flexibility over the life time in comparison to other rubber materials.

Danke !
(Wo sind Sie ?)

[Juddder]

Mr Cerbera said:

Hi Alex

Did you get the job done and can you recommend which of the fittings worked best ?

Ta !

Paul

Hey Paul

Here's some photos showing the comparison

7 x 3mm on the left (if the writing was the correct way up!)

Existing Injector O-Rings in the middle

7 x 4mm on the right

As you can see 7 x 4mm look much more like the original so would go with them - HTH!

[Mr Cerbera]

Juddder said:

Hey Paul

Here's some photos showing the comparison

7 x 3mm on the left (if the writing was the correct way up!)

Existing Injector O-Rings in the middle

7 x 4mm on the right

As you can see 7 x 4mm look much more like the original so would go with them - HTH!

You're a bloody star !

[ukkid35]

If they are too big it is very easy to nick them when fitting. The injector to rail must be close fitting or you'll get a fuel leak. Injector to manifold is less critical, the worst that can happen is an air leak, and the pressure differential is much lower. I still think 3.5mm x 7mm is the correct fitment for both ends.

[JanV]

Hello, do you guys have a part number for the o-rings 7mm x 4mm because I can’t finde those and my fuel rail won’t stopp leaking…

Greetings from Germany

[Juddder]

JanV said:

Hello, do you guys have a part number for the o-rings 7mm x 4mm because I can’t finde those and my fuel rail won’t stopp leaking…

Greetings from Germany

I don't have a part number but I checked back through my emails to 2016 (!) and these were the ones I ordered

https://www.bearingshopuk.co.uk/7-x-4mm-nitrile-70...

HTH!

Alex

[Juddder]

If those guys won't post you out any to Germany, let me know, I might have a few spares

[jstx]

I found some on Amazon that worked well for me - HiSport Fuel Injector O-Rings Set - [7.52mm X 3.53 mm]
https://www.amazon.com/dp/B08L4DYT8R