<VV> Cracked piston and cracked head

[MarK Durham]

James, welding aluminum has been done reliably in the aviation community
for some time. If the crack is only 1/4 inch deep, that is your best
option. However, its a mixed blessing to weld. Once you heat up that head
in a way that is different from its use as a head, none, some or all of the
machined surfaces may have moved out of alighment, and all need to be
checked for trueness before the head can go back on a car.


 Mark Durham
Hauser, Idaho
62 Monza coupe Red/Red 4 speed


On Thu, Mar 6, 2014 at 8:41 AM, James Cuneo <jamescuneo at hotmail.com> wrote:

> Many of you may remember from last month my dilemma with #5 piston
> cracking for the third time using Hi-Tech pistons. Thank you for all of
> your advice. I finally had time to pull and tear down engine to confirm
> cracked piston. It is cracked just like the pistons before it. I have
> purchased a set of forged pistons. My new problem is the left side 140 head
> is cracked in the #4 position.While looking at the chamber from the
> cylinder side, the crack appears at the 9 o clock position, extending from
> the inside diameter of the bore to the expansion slot cut between the #2
> and # 4 positions. The crack is 1/4 inch deep and does not extend down to
> the head gasket sealing surface. There is no evidence of leakage. Any
> advice on how to repair, I paid alot of $ to have deep seats, stainless
> valves, hi perf springs installed in these heads.Weld? stop drill? junk?Any
> advice on the head issue would be greatly appreciated.Jim Cuneo65 corsa
>  140 turboSonoma County CAjamescuneo at hotmail.com
>
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