2. If the cylinder head was submitted to a workshop for valve repair, the valves will already be installed in place, complete with all the parts.
3. Lubricate the valve stem with engine oil or moly grease and install the first valve, starting from either end on the cylinder head.
4. Three different types of caps are used on the engines in question, depending on the year of manufacture, displacement and power. As a rule, ring caps are installed, which are put on the guide sleeve. Flat seals are also used, which are inserted into the groove on the valve stem directly under the groove for crackers. Some engines are equipped with umbrella caps. Most often, umbrella caps are installed together with flat seals. Install the oil scraper cap on the valve guide sleeve (see photo).
5. Install the spring support washer (or a pack of washers), install the spring (or both springs) valves, oil deflector, plate (or valve rotator) (see photo).
6. Compress the valve spring with the tool and install the crackers into the groove on the valve stem. If the valve stem is sealed with an O-ring, carefully install it into the lower groove on the valve stem, avoiding twisting. Carefully release the spring, making sure that the crackers enter the upper groove of the valve stem. If necessary, lubricate the crackers with grease before releasing the valve spring to temporarily secure them to the valve stem (see photo).
7. Repeat all steps for the remaining valves. Make sure that the entire set of valve parts is installed in the same place. After assembly, check the tightness of the sealing rings. To do this, put the vacuum pump adapter on the valve plate or rotating device and create a vacuum (see photo). If a vacuum cannot be created, the seal is not airtight and should be replaced before installing the head on the engine.
8. Check the height of the spring in the loaded state using a ruler, a caliper with a depth gauge, or an indicator head (look at the photo). The spring length is measured from the spring support washer, or adjusting washer, to the top of the oil deflector (or the base of the plate or rotating device). If the height is greater than that specified in the Technical Data, add adjusting washers to the package under the springs.
Attention! It is strictly forbidden to reduce the length of the spring under load against the standard.
9. Lubricate the rocker arms and ball joints with molybdenum grease and install the rocker arm in place. Tighten the rocker arm nuts 3-4 turns.
[The article was reprinted from the website «CHEVYMAN.RU»]