Removal
1. Remove the valve cover.
2. Set the first piston to top dead center.
4.3 Remove the bolts (indicated by arrows) securing the rocker arm shafts - the picture shows a 2.0L Galant engine
3. Loosen the rocker arm mounting bolts one-quarter turn at a time until the spring pressure is completely released (4.3). Remove the bolts. If you are working on a DOHC engine, remove the camshafts.
4. Remove the rocker arms and rocker shafts from the cylinder head. If the engine has hydraulic valve adjusters, be careful not to let them fall off the rocker arms. Wrap pieces of electrical tape around the ends of the rocker arms to hold the adjusters in place.
Examination
4.5 Rocker arms and rocker shafts
1. Left rocker arm axle (longer than right axle); 2. Right rocker arm axle; 3. Front cover; 4. The arrow points towards the crankshaft pulley; 5. Rocker arms; 6. Intake valve rocker arm; 7. Spring - length in free state 53.3 mm; 8. Cover N₂; 9. Cover N3; 10. Cover N4; 11. Grooved washer; 12. back cover
The article is reprinted from a web resource: mitsubishiman
5. To disassemble and check the rocker arms, unscrew the mounting bolts, remove the rocker arms and springs from the axles (4.5).
4.6 Inspect the mating surfaces and the tips of the adjusting screws (indicated by arrows)
6. Clean the parts thoroughly and inspect them for wear and damage. On SOHC engines, check the surfaces of the rocker arms that contact the camshaft and the tips of the adjusting screws (4.6). Replace any damaged or worn parts. Make sure that the oil holes in the rocker arm shafts are not clogged.
Installation
4.7 Unscrew the adjusting screws so that their tips protrude by 1 mm
7. Loosen the rocker arm adjusting screw locknuts and unscrew the screws (4.7) until their ends protrude by 1 mm.
8. Lubricate all parts with special grease or engine oil and assemble the rocker shafts (SOHC engines). When you install the rocker arms, shafts and springs, pay attention to their markings and the difference between the left and right parts. On 8-valve engines, the slots in the ends of the shafts should be facing up. On 16-valve Galant engines, install the shafts so that the slots are facing outward. Insert the mounting bolts (16-valve) or install the covers (8-valve) to secure the parts.
9. Insert the hydraulic adjusters into the rocker arms and wrap the ends of the rocker arms with electrical tape to secure the adjusters.
10. Install the assembled axles and rocker arms onto the cylinder head, insert the mounting bolts and finger tighten the bolts. Check the markings on the covers. Remove the insulating tape from the rocker arms.
11. Tighten the bolts in several stages until the required tightening torque is reached.
12. Adjust the valve clearances using the adjusting screws (engine cold)
13. Temporarily install the valve cover in its place, start the engine and warm it up.
14. Re-adjust the valve clearances with the engine warmed up
15. Install the remaining parts in the reverse order of dismantling.
16. Start the engine and check for leaks.