[diesel_mercedes] Possible Stuck Valve

I think that the exhaust valve on my 1977 240D is either sticking
closed or opening late.

The symptom: The center of the glow plug on the number three cylinder
blows out of the body of the plug. The first time that it happened, I
figured that it was just an old plug that did not make it until I
planned on changing it. Now a new plug has blown out.

The only thing that i can think of would be the exhaust valve sticking
closed or opening late.

I am planning on replacing the timing chain, since I do not know when
the previous owners did that last.

Any other ideas that I should look at, before pulling the head to get
at the valves?

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