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Valve cover breaking where it did would seem to be the timing chain. However, like a surgeon doing exploratory surgery you will need to at least remove the valve cover to actually see what broke. After removing the valve cover, other parts will need to be removed to find out what went wrong and find all the parts that are damaged. This process can include a complete engine tear down depending on how extensive the damage is.
As I wrote in your post about fans belts, you need at least the Haynes manual and probably the official M-B manuals now.
Good Luck!
Tom
__________________
America: Land of the Free!
1977 300D: 300,000+ miles
American Honda: Factory Trained Technician & Honor Grad.
Formerly:
Shop Foreman;
Technical Advisor to Am. Honda;
Supervisor of Maintenance largest tree care co. in US for offices in Tex.
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