[DeTomaso] water pump mounting hole repair
Doug Braun
doug at silicondesigns.com
Wed Jun 2 16:34:39 EDT 2010
McMaster-Carr lists the max OD for a 5/16-NC18 Heli-coil at 0.400" and the
hole is already at 0.375 at a different thread pitch. I'm not comfortable
with only 0.012" more meat per side to tap into.
Doug
-----Original Message-----
From: Julian Kift [mailto:julian_kift at hotmail.com]
Sent: Wednesday, June 02, 2010 1:15 PM
To: De Tomaso List; doug at silicondesigns.com
Subject: FW: [DeTomaso] water pump mounting hole repair
Are you sure a helicoil insert is out of the question? Helicoils require
an oversize hole & tap size to thread the wire insert into, it maybe worth
checking what the drill/tap sizing is for a 5/16 helicoil insert.
Julian
> Date: Wed, 2 Jun 2010 12:32:49 -0700
> From: kenn_green at yahoo.com
> To: JDeRyke at aol.com; detomaso at realbig.com; doug at silicondesigns.com
> 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
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