Detonation can erode cylinder heads. How do the tops of the pistons
look? Spark plugs?

Angus

www.wordless.me

On Mon, Feb 13, 2012 at 6:55 PM, HotelWestfalia <zolo@foxinternet.net> wrote:
> First time I've seen this. �Very deep erosion around the spark area. �Next to the valves. �Between the valves, cutting under the valve seat. �Only three cylinders had it. �The heads had to be junked. �Deep, sharp pitting like, picking like erosion. �About 5mm deep.
>
> I don't have a sure idea what caused it. �Surely it is related to ignition or explosion or something of that kind.
>
> This engine has overheated badly. �One of the cylinders has even melted.
>
> I wonder, if anyone has seen any of this before. �And if any of you know what caused it.
>
> Best to all,
> Zoltan