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Thread: the plastic disc at the bottom of V8 Injectors?

  1. 17th February 2016, 11:21 PM #1
    Roverlord off road spares
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    the plastic disc at the bottom of V8 Injectors?

    I pulled the injector rail of my V8 Disco and noticed some of the injector bottom ends have a plastic?? Disc and others they are splitting and some are no longer there. I know very little about injectors and google doesn't reveal much. Is that disc just there to hold the bottom O ring in place or does it have some other purpose like a seal/Gasket ??.
    I'ts not a replaceable Land Rover part.
    Cheers, Mario

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  2. 18th February 2016, 03:44 PM #2
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    tommo1166
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    Just had a look at the set of re-manufactured injectors in the cupboard ready for my V8 when I get around to it. They all have the plastic disc you mention, can't really see the reason for it, maybe just to insulate the main body of Injector?
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  3. 18th February 2016, 03:51 PM #3
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    tailslide
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    Their only function is to retain the O ring on the injector. Once the injector is in the manifold then there is no longer any use for the retaining disk.
    Cheers Ron
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  4. 18th February 2016, 06:56 PM #4
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    Blknight.aus
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    its got 2 purposes.

    1. it retains the oring
    2. it serves as a backing/former for the oring to ensure it seals correctly on assembly.

    as the oring is not a dynamic seal its not critical until you have to reuse an old oring.
    Dave

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  5. 20th February 2016, 12:28 PM #5
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    An injector reco'er I emailed, confirms what all have said, it retains the O ring. They also said they sell just the plastic disc. but careful fitting of injectors in the fuel rail is all that's required. I actually have never had an o ring fall off.
    Cheers, Mario

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