[DeTomaso] 4416 Runs but need help with A3's and key switch

[Will Kooiman]

The big plugs on the ends of the heads are pipe threads.  The ones on the
front of my heads are 3/4" pipe threads.  The plugs in the back look larger,
but they're probably also 3/4" pipe.

Good luck removing them.  If the heads are used, they're probably seized up
pretty tight.  I believe the factory plugs were aluminum.  It tends to bond
to the head after the plug has been there a while.  I'd ask a machinist how
to remove them.  Once removed, I'd seal them with regular pipe dope.

There are also 4 very small plugs that are 5/16" coarse threads.  They are
on the intake face at the ends.  You can either plug them with 5/16" bolts
or set screws.  I used stainless set screws with a little bit of silicone.
Some intakes have bolt holes in those locations.  The intake I recently
installed had them exposed in the rear, but covered in the front.  The one I
removed had them covered on both ends with a boss to drill out if you wanted
to run lines.

Keep in mind I'm not a machinist.  The older wiser guys on the list know
more about this stuff than me.  That's what worked on my A3 heads, though.

Will. 

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of charles buthala
Sent: Thursday, June 28, 2007 8:53 PM
To: detomaso at realbig.com
Subject: [DeTomaso] 4416 Runs but need help with A3's and key switch

The monster is alive after many months, dollars, and time.  I had the engine
totally overhauled and all new components installed.  My neighbor said that
we loosened his dentures when we got it rev ed up to get the bearings lubed.
  After heating up to 160 F there was steam coming out of the four plugs in
the 6049-A3 heads.  Are the plugs in the ends of the heads pressed in or
screwed in?  The heads were cleaned and machined, could the cleaning have
caused the plugs to loosen or break the seal that they had before?  Has
anyone else had this problem and how did you fix it.  I need to know if they
are a press fit or threaded and what method was used to seal them back up.
  My second problem is the ignition switch.  I could not turn the engine
off.  The key switch did nothing.  I was going to convert it to a push
button start but never got around to doing so.  I read something a while
back that there was a company selling components for a reasonable price?

       
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