Ring/donut around the injector nipple?

Found these on the internet. Just wanted to verify that these are the rubber fitting that goes in the intake manifold and the injector nipple goes through this ring. The ones out of the engine must be deformed from the heat and age

15%20PM

Deformed isn’t a problem. Hard as cee-mint is a problem!

Found these on the internet. Just wanted to verify that these are the rubber fitting that goes in the intake manifold and the injector nipple goes through this ring. The ones out of the engine must be deformed from the heat and age

I call them injector seals, and it does seal the injector pintle to the intake manifold. Oddly, I have seen them hard and others spongy.

SD Faircloth
www.jaguarfuelinjectorservice.com

Play it safe…replace them all and REPLACE the O RING injector seals with the modern ETHANOL SAFE RINGS!
Old ones were black the new ones are , green, purple or other colors.
Its a big safety issue.
Good luck.
gtjoey1314

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Originally jaguar used seals which have more complicated shape and those seal much better, later they superseded to this simple donut shaped ring. I have seals available shaped exactly as originals

You’ve taken to manufacturing rubber stuff too, John?

Nope, not yet… I’m outsourcing those :wink:

Do you have a picture of those originals? The ones that are now on the car look exactly like the picture from eBay. The ones in the gasket kit are totally different. I can put up a picture of what I think are the seals in the kit in a bit.

John John,

I am going to respectfully disagree with you that the original seals “seal” much better. I am not sure how many of the OEM design seals you have actually seen fitted to an engine and whether in fact they seal better than the others. And if you have tested each design for vacuum leaks.

I have seen the design you are referring to, but not frequently at all installed on the V12 injectors that use a seal (as opposed to an o-ring) and I have literally seen several thousand V12 injectors right out of the engine.

I would also out of curiosity like to know how you know that “your” seal is/was the OEM design ? Used circa 35-40 years ago.

SD Faircloth

Hi John_John1,

These that you showed are from my 90 V12 which have never been changed since production in England. 24%20PM

These (2 views) were in the SNG Barratt gasket kit. You can see from the two views that they are a cup. I tried one and they really fit snugly in the manifold and around the tip of the injector with the sides of the cup running up higher on the injector. The kit also has some small 0 rings but they are not in the engine as torn down so I’m going to leave those out. Also not knowing where they really go.

I have the latest on order, the donuts with the rectangular cross section like I posted earlier.

Those are intake valve stem seals and not injector seals :wink:

I’m not entirely convinced it makes any difference which shape seals you use other than perhaps in difficulty in installation. As I recall they’re no picnic to install, especially if you’re trying to install 5 at once. Good lube is essential.

I love the aftermarket vs OEM prices on that first post. $18 a seal. That’s $216 a set?!

It’s a rubber seal, clamped down well, with no motion possible.

A proper length of 5/16 fuel line would work identically and never give you a bit of trouble.