BADSUV

After reading other threads I inspected my 98 ML320 engine. Not surprising the valve covers and evaporators were leaking. So, I get new gaskets and RTV sealant, remove old valve covers and see lots of sludge. This engine is 13yrs old and 210,000 miles on it. Do I leave it alone and just replace the gaskets and sealant, or is there something more I can do or should do? I will for sure completely clean the Valve covers, replace cracked hoses, and do engine flush when done. I hear a slight ticking sound on passenger side rear valve train. What does one look for when visually inspecting the valve train? I took pictures for all to see..

Benzo 003

I would definitely clean the valve cover, but would not touch the internals. There is a possibility that a return hole could get clogged if you were to scrape at or even use compressed or something to clean up the engine.
I don't think RTV is required, it should be a rubber seal, not an actual gasket, unless the parts counter suggested it.
Regarding the ticking, it's NOT an ole Chevy where you could giggle the rockers arms to find the loose ones them snug em down. I do alot of my own work, but adjusting internal components on these engines could be a dangerous thing without the know how and specs to achieve the right tolerances.

BADSUV

Thanks for your info, I will leave enough alone. The MB Dealership swears by the MB Black sealant for the evaporator seal and I found that recommendation somewhere here in the forums also... Again thanks!!