Bleeding lash adjuster system

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: It can possibly be difficult to check the oil level within 30 seconds of the engine stopped because of the structure of oil level gauge. If it's difficult, the oil level must be checked later. The oil level always check at the one side of oil level gauge: at the rear side of the vehicle. The oil level cannot be checked at the another side because the engine oil adheres to all the surfaces.

Fig 1: Checking Engine Oil Level

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Check engine oil and add or change oil if required.
NOTE: If the engine oil level is low, air is sucked from the oil screen, causing air to enter the oil passage.

NOTE: If the engine oil level is higher than specification, oil may be stirred by the crankshaft, causing oil to be mixed with a large quantity of air.

NOTE: If oil is deteriorated, air is not easily separated from oil, increasing the quantity of air contained in oil.

Fig 2: Identifying High-Pressure Chamber
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

NOTE: If air mixed with oil enters the high pressure chamber inside the lash adjuster from the above causes, air in the high pressure chamber is compressed excessively while the valve is opened, resulting in an abnormal noise when the valve closes. This is the same phenomenon as that observed when the valve clearance has become excessive. The lash adjuster can resume normal function when air entered the lash adjuster is removed.
Idle the engine for one to three minutes to warm it up.
Repeat the operation pattern, shown in left figure, at no load to check for abnormal noise. (Usually the abnormal noise is eliminated after repetition of the operation 10 to 30 times. If, however, no change is observed in the level of abnormal noise after repeating the operation more than 30 times, suspect that the abnormal noise is due to some other factors.)
After elimination of abnormal noise, repeat the operation shown in left figure five more times.
Run the engine at idle for one to three minutes to make sure that the abnormal noise has been eliminated.

Fig 3: Air Bleeding Operation Pattern
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.