[DeTomaso] water pump mounting hole repair

[Doug Braun]

McMaster-Carr lists the max OD for a 5/16-NC18 Heli-coil at 0.400" which is
larger than the 0.368" ID of a 7/16-NC14 threaded hole.  This means I'd be
burning my bridge for trying to use the far stronger EZ-Lok threaded insert.

Doug
  -----Original Message-----
  From: Ken Green [mailto:kenn_green at yahoo.com]
  Sent: Wednesday, June 02, 2010 12:33 PM
  To: JDeRyke at aol.com; detomaso at realbig.com; Doug Braun
  Subject: Re: [DeTomaso] water pump mounting hole repair


        If you don't need a lot of strength, what if you cross-thread the
3/8 hole with a tap for a 5/16 helicoil and add some filler like JB weld
when you thread the helicoil in, maybe that would work?  Kind of a cludge,
but might be good enough?

        Ken

        --- On Wed, 6/2/10, Doug Braun <doug at silicondesigns.com> wrote:


          From: Doug Braun <doug at silicondesigns.com>
          Subject: Re: [DeTomaso] water pump mounting hole repair
          To: JDeRyke at aol.com, detomaso at realbig.com
          Date: Wednesday, June 2, 2010, 11:33 AM


          For two reasons

          1) Because I don't want to ruin the valuable 1970 original water
pump
          casting by drilling it's thru hole out to 3/8".

          2) The judges check the heads and head markings on the water pump
bolts.
          These are indented head bolts which if you file down an indented
3/8 head,
          the indent will disappear.

          Do you think that not enough meat will be present in the casting
to support
          the threaded-insert?

          Doug

          -----Original Message-----
          From: detomaso-bounces at realbig.com
          [mailto:detomaso-bounces at realbig.com]On Behalf Of JDeRyke at aol.com
          Sent: Wednesday, June 02, 2010 10:25 AM
          To: doug at silicondesigns.com; detomaso at realbig.com
          Subject: Re: [DeTomaso] water pump mounting hole repair


          Doug, since you seem to want to rescue this thing at any cost, why
not take
          the oversize 3/8" bolt and carefully file its hex down to a
5/16"-size. In
          place, no judge will see the bolt threads or shank. Whatever, good
luck- J
          Deryke