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  • He Who Shall Not Be Named
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  • He Who Shall Not Be Named
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    Originally posted by SSBN659 View Post
    Taking us to school, thanks David.

    Will Rogers
    SSB659
    Automotive fillers, putties, primers and paints are our friends!

    Just passing on what I learned from others.

    David

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  • SSBN659
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    Taking us to school, thanks David.

    Will Rogers
    SSB659

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  • He Who Shall Not Be Named
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  • He Who Shall Not Be Named
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    Originally posted by george View Post
    The drill bit pictured in post #1688, is it the size of the O-ring? Was there any mod done to the drill bit before using it?
    To render a non-interference fit to the raw castings .062" bore -- created by the brass rod core during the casting operation -- it is hand reamed with a standard (non-modified) .065" bit.

    The two encapsulated O-rings, within the seal body, have a nominal .060" inside diameter, but those surfaces (being much more elastic than the surrounding resin) scoot out of the way when reaming with the over-size bit. This leaves the resin bore enlarged enough to easily pass the pushrod, with the O-rings projecting into the bore enough to girdle and make watertight the fit between pushrod and seal body.

    David

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  • george
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    The drill bit pictured in post #1688, is it the size of the O-ring? Was there any mod done to the drill bit before using it?

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  • He Who Shall Not Be Named
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  • george
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    Ah, Thank You for your reply and educational lessons, Master Sir.

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  • He Who Shall Not Be Named
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    Originally posted by george View Post
    Sorry, not sure of what I am looking at in the last five pictures. Multiple pushrod seals? But looks like a lot on one shaft for multiple casting????
    Yes. And yes.

    It's easier to use one long brass rod core than a bunch of short cores. The current tool has three ten-seal castings, and two eight-seal castings. After casting each core rod is pulled and the individual pushrod seals separated on the bandsaw.

    Here's the less efficient 'old-school' pushrod seal tool and casting -- too labor intensive.






    David

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