[DeTomaso] water pump mounting hole repair

Dave Londry davel at emspace.com
Wed Jun 2 14:56:33 EDT 2010


Doug
What about filling the hole, re drilling and tapping at 5/16.
There are a bunch of metal-loaded epoxies that are supposed to take that 
kind of torque,
or LNS plugs, but I don't know where to go for those.
http://www.r-f.com/lock_n_stitch_repair.asp
dave

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Dave Londry
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davel at emspace.com

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Doug Braun wrote:
> That would require a nut on the end of the stud which would not appear the
> same as the proper indented hex head of the original bolt, but at least I
> wouldn't have to drill out my valuable water pump to fit the larger bolt.
>
> Doug
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com
> [mailto:detomaso-bounces at realbig.com]On Behalf Of Ken Green
> Sent: Wednesday, June 02, 2010 10:54 AM
> To: DeTomaso Forum; Doug Braun
> Subject: Re: [DeTomaso] water pump mounting hole repair
>
>
> I've seen stepped studs somewhere.  Maybe you can find one with the correct
> threads and just screw it in.
>  
> Ken
>
> --- On Wed, 6/2/10, Doug Braun <doug at silicondesigns.com> wrote:
>
>
> From: Doug Braun <doug at silicondesigns.com>
> Subject: [DeTomaso] water pump mounting hole repair
> To: "DeTomaso Forum" <detomaso at realbig.com>
> Date: Wednesday, June 2, 2010, 10:06 AM
>
>
> In my younger days (30 years ago), one of the water pump bolt holes in my
> block stripped out. Back in those days, I hadn't even heard of heli-coils
> so I did a backyard fix by drilling and tapping the errant 5/16-NC-18 hole
> out
> to 3/8-NC16.  I then drilled out the corresponding hole in the water pump
> to 3/8, installed a very non-stock looking 3/8 bolt and went merrily on my
> way.
>
> Fast-forward to now and I'm using the same block in a car that will be
> concours judged. The water pump I'll be using is an original, unmolested,
> "D0OE-D" 1970 water pump and I don't want to destroy it's value by drilling
> out one of it's holes to 3/8 in order to use it.  So I'm looking for an
> alternative.
>
> Since the heli-coil approach is no longer viable, I'm considering using
> either a 90259A139 or 92070A120 threaded insert from McMaster-Carr
> http://www.mcmaster.com/
>
> The hole in question can be seen here:
> http://www.poca.com/index.php/gallery/?g2_itemId=21099
> and is the one near the center of the picture next to right side of the cam
> sprocket.  After tapping the hole to 7/16-NC14, the block will have about a
> 0.13" margin of cast iron block material left at the lower left quadrant of
> the hole and a greater margin than that for the other 3 quadrants.
>
> Does anyone see a risk in using this approach? Is one of the two threaded
> inserts I referred to above superior to the other in this application?
>
> Doug Braun, blue 73L #5505
>
>
>
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