117 engine in the 560 SEL.

Did you see any timing chain marks on the heads below the valve cover lips near the timing chain.Timing chain noise is usually just at cold start up until the tensioner fills with oil then it goes away. Check out the chain marks ASAP. You may have a weak tensioner. A replacement may be in order.

__________________
1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.