RE: [DMCForum] The head and rolling the dice

["Travis Goodwin" <tgoodwin@xxxxxxxxxxxx>]

Rob also mentioned these:

http://www.timesert.com/

> -----Original Message-----
> From: Walter Coe [mailto:Whalt@xxxxxxx]
> Sent: Wednesday, July 09, 2003 5:32 PM
> To: DMCForum@xxxxxxxxxxxxxxx
> Subject: Re: [DMCForum] The head and rolling the dice
> 
> > Now Walt, you said you had success welding the head. Where did you
have
> to
> > have it repaired? Is this head on a car?
> 
> This wasn't the head.  It was the crank case block.  Just forward of the
> water pump on top of the block there are two plugs.  The casting around
> the
> smaller one (same as the oil drain plug) got a hair line crack.  This
> happened when the owner's brother was driving it about a mile from home.
> Smoke started pouring from the engine.  It was obviously oil burning on
> the
> muffler, so the guy drove it home.  It lost about a quart of oil.
> 
> I tried soldering it with brazing rod and a torch, but the alloy just
> wouldn't stick.  I ground off what was left of the nipple.  Then the
> professional weldor turned that into a neat flat area.  Now that I've
> jogged
> my memory, it took two trips for the weldor.  The first time he didn't
> weld
> the whole crack because he couldn't see how far it went.  We thought it
> was
> only the nipple that cracked, but it was also the area around it.  The
> second time he welded all the crack and then welded a plate across the
> whole
> top of the engine.  The only reason for the plate was to keep crap out
of
> the casting voids.  That was the owner's idea.  This car is still
running
> strong.
> 
> Rob Grady has warned me before about drilling too deep on exhaust
manifold
> studs.  It sounds like you only drilled into a coolant passage way.  If
> that
> were my problem, I would drill & tap the hole and put a set screw in the
> bottom with plenty of red loc-tite.  I would use a set screw with an
allen
> head if I could find one or just cut the head off of a bolt and slot the
> end
> so I could get a screwdriver on it.  The only problem with this idea is
> that
> the plug you use can't be any larger than the tap for the thread repair
> kit.
> Ideally the plug should be the same size & thread, but that may be a
> bastard
> size.  Yes, this is an appropriate use of the word bastard -- in this
> sense
> it means odd-ball, unusual, one-off/custom.  I wouldn't trust a thread
> repair kit to hold back coolant.  I wouldn't trust any epoxy either.
> 
> Can a weldor reach the inside to repair it from the back side?  Probably
> not.  It is a very deep hole to repair from the outside especially since
> you
> have to drill & tap a new hole in the middle of it.  And then the gasket
> surface could get messed up.  How far did you have to drill to get
through
> the block?
> 
> I say put a plug in it -- you have a reputation for being good at
plugging
> your tail pipe anyway. ;-)
> 
> Walt
> 
> 
> 
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