Thanks Tony, good info! My machinist was concerned about that and now I
have some more info for him.
Tim
-----Original Message-----
From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf Of Tony Drews
Sent: Saturday, May 12, 2012 12:36 PM
To: fot@autox.team.net
Subject: Re: [Fot] TR4 head crack between water holes
Subject was "[Fot] TR4 Valve spring - pressure, assembled height, suppliers"
I think we're talking about different areas of the head.
The area Richard was talking about is between the two water holes in
the head between Cyl #2 and #3.
There's a picture of my (old) head here:
http://www.tonydrews.com/2008-9Rebuild/DSCN0536.jpg
It pretty clearly shows this area of the head, and you can also see
the lines that are the edges of where the head gasket runs.
There is no gasket surface area near that particular crack, and the
other side of the water jacket (to run the pin / peg against) is far,
far away, very deep into the head.
On the other hand, there is the idea of "pinning" the head when you
mill a bunch off. THAT may have prevented the crack in the head
which caused me to have to have a new one prepared. There's some
detail about that at the bottom of this otherwise unrelated page:
http://www.tonydrews.com/Tony_Car.htm
For that, you drill and tap holes around the periphery of the
combustion chamber on the opposite side from the valves, screw
something through the holes against the other side of the water
jacket with some threadlocker, cut them off and have the surface
ground / milled smooth.
There is also a method of fixing cracks using overlapping screw-type
pegs "stitching" I think it's called - that was one possible
suggestion for an attempted repair of this crack:
http://www.tonydrews.com/Test%20Pics/2012_0331Head_Crack0007.JPG
There may be some value in fixing a crack between the water holes
between Cylinders 2 and 3, but I'm not seeing it, and "Uncle" Jack
always considered that to be a total non-issue. Cracks between the
valve seats (another common problem) ARE a big deal.
Tony
At 11:17 AM 5/12/2012, Joe Alexander wrote:
>TeriAnn is right.
>
>It might be in one of Kas' books, I think. TeriAnn's comprehensive website
on
>heads is back up, according to TeriAnn. Another great resource that we
have
>on the FOT LIST, regardless of competition status.
>
>There is a suggestion that this area can flutter and perhaps can disturb
the
>gasket seal.
>
>The fix is something like drilling and tapping this area and running a
screw
>down to a solid point in the water passage.....then milling flush.
>
>The FOT list is very much alive and well. The Mitty provided some stimulus,
>methinks.
>
>
>
>
>
>Joe Alexander
>A. R. E.
>645 1st Street
>Jesup, Iowa 50648
>319.464.4711 (cell)
>n197tr4@cs.com
>
>
>
>
>
>-----Original Message-----
>From: TeriAnn J. Wakeman <tjwakeman@gmail.com>
>To: fot <fot@autox.team.net>
>Sent: Sat, May 12, 2012 10:37 am
>Subject: Re: [Fot] TR4 Valve spring - pressure, assembled height, suppliers
>
>
>On 5/11/12 7:53 PM, Tony Drews wrote:
> > Richard, the crack between #2 and #3 cylinders between the water holes
> > is no big deal, don't worry about it.
> >
>Shouldn't you at least peg the crack?
>
>Teriann
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