67 L79 Dipstick Tube Seal - NCRS Discussion Boards

67 L79 Dipstick Tube Seal

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  • Jeffrey S.
    Extremely Frequent Poster
    • May 31, 1988
    • 1879
    #16
    Re: 67 L79 Dipstick Tube Seal

    Originally posted by Joe Lucia (12484)
    Jeff------


    I don't know where you found the GM #3865664 tube in the AIM as you mention in the article. That tube was never used in PRODUCTION for any Corvette, 1969 or otherwise.
    Also, the reason that the end of the tube that inserts into the block is of the larger OD than the orifice is to ensure a tight interference fit. The larger OD causes it to be "swaged" into the orifice. Some folks reduce the OD of the tube "to make it go in easier". This is not wise because it will also make the tube come out easier. One can put the tube in the freezer for several hours before installation, removing it just before installation.
    Joe,
    Thanks for pointing that out. That is an error- I meant to say that the part I got from the dealer is still the part number listed in the early parts book not the AIM.
    Jeff
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      • Joe L.
        Beyond Control Poster
        • February 1, 1988
        • 43193
        #17
        Re: 67 L79 Dipstick Tube Seal

        Jeff------


        Yes, the 3865664 part number is shown in P&A Catalogs for 1963-74 Corvettes published after about mid-1974.
        In Appreciation of John Hinckley
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          • Richard G.
            Extremely Frequent Poster
            • July 31, 1984
            • 1715
            #18
            Re: 67 L79 Dipstick Tube Seal

            Tom;
            What does a tube expander look like?

            Was it just a piece of steel slightly larger than the collapsed one's ID?
            If so, I see where the tube driver could be used backwards to support the tube while the expander is inserted.
            Then remove the expander with a pair of channel locks?

            Another modern chemical that didn't exist in the 60's, at least to my knowledge, is Loctite.
            The removable blue type might work just fine if the hole in the block is properly cleaned.
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              • Tom E.
                Very Frequent User
                • June 1, 2019
                • 448
                #19
                Re: 67 L79 Dipstick Tube Seal

                Originally posted by Richard Geier (7745)
                Tom;
                What does a tube expander look like?

                Was it just a piece of steel slightly larger than the collapsed one's ID?
                If so, I see where the tube driver could be used backwards to support the tube while the expander is inserted.
                Then remove the expander with a pair of channel locks?

                Another modern chemical that didn't exist in the 60's, at least to my knowledge, is Loctite.
                The removable blue type might work just fine if the hole in the block is properly cleaned.
                Attached Files
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                  • Gary B.
                    Extremely Frequent Poster
                    • February 1, 1997
                    • 6979
                    #20
                    Re: 67 L79 Dipstick Tube Seal

                    Tom,

                    Who makes that tube expander tool you show?

                    Gary
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                      • Tom E.
                        Very Frequent User
                        • June 1, 2019
                        • 448
                        #21
                        Re: 67 L79 Dipstick Tube Seal

                        Originally posted by Gary Beaupre (28818)
                        Tom,

                        Who makes that tube expander tool you show?

                        Gary
                        Gary,
                        I have no idea, I just grabbed a google photo to show the product. My son in law has an HVAC/Refrigeration business and I borrowed his.
                        Tom
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