Mystery hoof marks in combustion chamber

#1
I am in the process of awakening a ´68 2000 TC that´s been off the road since 1982. As the compression ratio was almost nil on a two cylinders, I removed the cylinder head to have a peep. Before doing that, the valve clearances were checked and found to be zero on number 3 and just over nothing on cylinder number 2. I had expected burned exhaust valves, but to my surprise both valves and seats look ok - no cracks - though the valve stem on exhaust number 3 has a lot of carbon deposits, which may well be the reason for the lost compression. But SOMETHING nasty has happened, as can be seen from the photos - but what? Am pretty certain that this is the first time the head´s been off since the seventies, as witness the presence of Jubilee clips and state of hoses etcetera. Any suggestion on what's entered the cylinder and caused these marks would be appreciated!
 

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#4
Ah, of course, thank you both, clive and penguin! It is perhaps the remains of an old disaster, totally unrelated to my problems of today. There are no scores on the cylinder walls and there were no metal pieces lying about, which one would otherwise suspect.
 

sdibbers

Well-Known Member
#6
Ah, of course, thank you both, clive and penguin! It is perhaps the remains of an old disaster, totally unrelated to my problems of today. There are no scores on the cylinder walls and there were no metal pieces lying about, which one would otherwise suspect.
I would check the valve heads on that cylinder. They may have been knocked slightly bent causing the gap close up and the loss of compression due to it not seating correctly.
 
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