I'm no mechanic, but from what I have read, the later model engines have hydraulic lash adjusters that can be tested and replaced(Haynes manual).
They are not adjustable.
There is no adjustment. If they are clacking you have worn valve train parts, replacement is your only option.
The 2009 Mitsubishi Outlander has 16 valves.
The 2006 Mitsubishi Outlander has 16 valves.
The 2014 Mitsubishi Lancer has 16 valves.
The 2010 Mitsubishi Outlander has 16 valves.
The 2012 Mitsubishi Outlander has 16 valves.
The 2012 Mitsubishi Lancer has 16 valves.
The 2004 Mitsubishi Lancer has 16 valves.
The 2005 Mitsubishi Outlander has 16 valves.
The 2014 Mitsubishi Mirage has 12 valves.
The 2013 Mitsubishi Lancer has 16 valves.