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  1. #41
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    Arrow Polaris Ficht fuel injector internal o-rings, Bottom o-ring #4

    O-ring number 4, the very bottom o-ring, measures;

    Inside Diameter 1.08 inches (~27.432mm)
    Material thickness approx. 0.10 inches (~2.54mm)

    Cross section is round
    Material color is Black

    The injector barrel into which the lower two o-rings slide is 1.25 inches (~31.75mm) inside diameter.

    Closest AS568 standard size seems to be 121
    McMaster-Carr number 9452K85 (Buna-N O-Ring AS568A Dash Number 121)
    McMaster-Carr O-ring sizing chart

    This is the o-ring that actually seals the injector from the outside world, and is the likely failure if the injector is leaking a blackish or brownish ooze around the bottom of the injector and onto the top of the cylinder head. Below this o-ring the threads of the injector core are exposed to the elements.

    Tip: If you see corrosion in this area or just want to guard against corrosion you can try spraying a protectant such as Fluid Film into the exterior gap between the clamping ring and the installed injector body. Be sure to use a product that will not attack the o-ring material.
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    Last edited by K447; 07-30-2013 at 09:48 PM.


  2. #42
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    Quote Originally Posted by BryanP View Post
    The brown O ring is probably Viton
    Indeed.

    Can someone confirm or correct the appropriate replacement o-ring standard sizes I have calculated from the measurements?

  3. #43
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    Quote Originally Posted by K447 View Post
    Quote Originally Posted by BryanP View Post
    The brown O ring is probably Viton
    Indeed.

    Can someone confirm or correct the appropriate replacement o-ring standard sizes I have calculated from the measurements?
    They may very well be metric. Try taking metric measurements and see what you come up with.

  4. #44
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    Quote Originally Posted by BryanP View Post
    Quote Originally Posted by K447 View Post
    ... Can someone confirm or correct the appropriate replacement o-ring standard sizes I have calculated from the measurements?
    They may very well be metric. Try taking metric measurements and see what you come up with.
    I shall use a calculator ...

  5. #45
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    Ficht Fuel injector, mounting bracket on top of injector, 'fat' o-ring as 'spring'

    This is the large fat o-ring that sits on top of the injector body, but underneath the top of the metal mounting bracket.

    It provides a 'spring tension' resilient pressure between the bracket and the top of the actual fuel injector.

    Note that the main clamping force for the injector is provided by the long bolts that clamp down on the lower clamp flange and actually press the injector tip into the bore in the cylinder head.

    The fat o-ring provides a resilient clamping effect, and probably absorbs some engine vibration to prevent the injector from shaking itself apart.

    My guess on size is standard 328, which is 1.850 by 0.210 Buna-N (Nitrile)
    McMaster-Carr Buna-N 9452K47

    Fractional Size
    ID 1 7/8"
    OD 2 1/4"
    Actual Inch Size
    ID 1.850"
    OD 2.270"

    Width: 3/16" Fractional (0.210" Actual)
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    Last edited by K447; 08-01-2013 at 12:39 PM.

  6. #46

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    Why don't you just buy the ones that fit correctly?
    The link is for (1) o-ring kit only, so you need to order one kit per injector.
    http://www.weberpower.com/parts-webe...-ring-kit.html

    Best regards,
    Randy

  7. #47
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    Quote Originally Posted by Weber Guy View Post
    Why don't you just buy the ones that fit correctly?
    The link is for (1) o-ring kit only, so you need to order one kit per injector.
    http://www.weberpower.com/parts-webe...-ring-kit.html

    Best regards,
    Randy
    That link is for Bosch 4-stroke fuel injectors, this is about the Ficht 2-stroke fuel injectors

  8. #48

  9. #49
    Good evening, sorry for the question but I need to know the extent of the 'o-ring located between cylinder head and injector (the external one) thanks.

  10. #50
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    Quote Originally Posted by fubellik77 View Post
    Good evening, sorry for the question but I need to know the extent of the 'o-ring located between cylinder head and injector (the external one) thanks.
    There is no o-ring between the Ficht fuel injector tip and the cylinder head.

    It is a direct metal to metal seal using the clamping pressure from the two mounting bolts.

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