Toyota 13812-56030 Arm Sub-Assembly, Valve Rocker

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Remove the valve cover and tighten the nut by first starting at the front side of the cylinder head and unfasten the rocker arm bolts gradually, as much as possible in the recommended order with the assembly parallel to the plane of the cylinder head. Pull out the rocker arm assembly as a single unit at a time, place the push rods in a paper box with holes to ensure that they do not get clumped together and be cautious of losing any of the components off the rocker shaft. Remove the pushrods from the engine and set them aside in a different place because you may get lost when it is time to re-install them. Inspect all rocker arms for signs of wear, cracks, and other operational damage on the areas where the pushrods and the valve stems touch the faces of the rocker arms while confirming that all the holes at the pushrod end of the rocker arms are open. Checking the pushrod end of each rocker arm for wear, cracks, or galling; should a rocker arm be at all worn or abused, it should be changed, along with its pivot. Check the pushrods for indicative signs of cracks, uneven wear along their strap like lengths, and at both ends, and to check for bending, roll each pushrod on a piece of plate glass. Clean and apply engine oil or moly-base grease on the lower ends of the pushrods and fit them in the corresponding positions, such that each of the pushrod has a proper fit inside the lifter socket. It is also recommended that moly-base grease applied to both the subhead termed, valve stem-ends and the top ends of the pertinent push rods before orienting the rocker arms and fixing the capscrews. Place the rocker arms into position and fit the pivots, bridges and capscrews before applying moly-base grease to the pivots thus protecting the contacting surfaces from being damaged by the pressures always associated with oil before tighter pressures from engine oil are established. Loosen it with a little at a time in the said sequence until the torque gets to the specified value, replace the valve cover, start up the engine, observe for oil leakage and weird sounds from the valve train.