Start by looking for damaged and raised areas on the valve stems when the engine cylinder head is on the block. Replace any damaged valves. After removing the cylinder head bolt cover, remove the nuts, assemble capscrews, bridge and pivot assemblies and
Rocker Arms to gain access to the valve springs. Hold the push rods, bridges, pivots and rocker arms in precisely the spots and arrangement they had originally. Check over the springs and clamps for cracks, replace them if they appear weak and take out the spark plug(s) next to the cylinder(s) that have valve springs. Place the flexible portion of the air adaptor on the A/C service port and inflate the system to at least 621 kPa (90 psi), to hold the valves against their seats when working on the No.1 cylinder of a car with an air conditioner. Knock the retainer or tip with a rawhide malt to make the lock loose, then press it down using the Valve Spring Compressor Tool MD-998772A and remove the lock. Remove the valve spring, the retainer and the valve stem seals, as each side has different intake and exhaust valve stem seals shown as INT (Gray) and EXH (Brown), respectively. When installing, make sure the valve stem seal is pushed all the way down over the stem and the valve guide boss. Add the valve spring and retainer, compress the spring using the MD-998772A valve spring compressor, insert the valve locks, relax the spring by removing the tool and finally hit the spring to ensure it is correctly seated. Pull out the air pressure from the tire, take off the air hose, get rid of the adaptor inside the plug hole and install the spark plug. Rinse and repeat for the rest of the valve springs, too. Push rod installation is complete once the bottom end of each rod lines up with the plunger cap seat inside the hydraulic valve tappet and then the rocker arms, pivots and bridge are placed as they were original. After every four shoulder screws on the bridge are tightened, go on to the next four with alternating rotations until you reach 28 Nm (21 ft. lbs.).