Bought a 2000 Boxster engine project

[elgyqc]

Upon closer inspection both exhaust valves are broken in cylinder 3. The cams are out and I found this strange material on the timing gear. It is very hard and not metallic.



Looks like a sealant or repair material. It has been there for at least some revolutions. I found some small pieces of the same material in the oil pan.



I can't think of anything that is supposed to be in the engine that would look like this.
I don't see how this could have caused the broken valves. I would think that the chain tensioner would absorb the extra tension as the blob passed under the chain. It would be nice to know if the chain had jumped a tooth or two...

[Homeoboxter]

Originally Posted by elgyqc

Upon closer inspection both exhaust valves are broken in cylinder 3. The cams are out and I found this strange material on the timing gear. It is very hard and not metallic.



Looks like a sealant or repair material. It has been there for at least some revolutions. I found some small pieces of the same material in the oil pan.



I can't think of anything that is supposed to be in the engine that would look like this.
I don't see how this could have caused the broken valves. I would think that the chain tensioner would absorb the extra tension as the blob passed under the chain. It would be nice to know if the chain had jumped a tooth or two...

Looks like a piece of a chain pad jammed in between the teeth and the chain.

[elgyqc]

Originally Posted by Homeoboxter

Looks like a piece of a chain pad jammed in between the teeth and the chain.

I don't think so. It is rounded like a liquid or semi-liquid which has hardened... I've seen a lot of pieces of chain pads and it is not the same.

... EDIT - I think you are right, see the photo in the next post.