When the head is returned from the workshop, the valves and associated components will already be installed. In this case, you should skip the procedures in the next five paragraphs and go straight to the actions described in paragraph 7.
1. First of all, install the valve spring seats on the valve guide bushings (see accompanying illustration).
Warning! Stop tapping the cap immediately after it is fully seated on the bushing - further impacts may damage the rubber. Make sure that the caps are not twisted on the bushings.
2. Install a new oil seal onto each guide bushing. Oil seals (intake and exhaust valves) "sit" on their guide bushings by gently tapping.
Note: Inlet and outlet valve stem seals are different sizes and are color coded (see accompanying illustration) - don't confuse them.
3. Working from one end of the head to the other, lubricate the first valve with molybdenum-containing or engine assembly grease and seat it in the head. Lubricate the valve stem with clean engine oil.
4. Place the valve springs and their plate on the rod (see accompanying illustration). Using a special tool, compress the springs by lowering the plate, then install the split lock crackers into the opened groove on the valve stem.
Note: Valve springs are installed with coils with a reduced pitch towards the head.
5. In order to temporarily fix the crackers until the tool is released, lubricate them on the inside with thick grease (see accompanying illustration). 6. Repeat the procedure for the remaining valves. Make sure that all components are installed strictly in their original places.
7. Using a vernier caliper, check the installed height of the valve stems (distance from the spring seat to the end surface of the valve stem) (see accompanying illustration). If the head repair was performed in a car service workshop, this parameter will already be adjusted properly. If the result of any of the measurements exceeds the permissible Specifications value, replace the corresponding valve and repeat the check. If replacing the valve does not correct the situation, then the valve seat is too deeply seated in the head and the latter must be replaced.
8. Lubricate the working surfaces of the valve drive rocker arms, camshaft cams and journals and rocker arm shafts with engine assembly grease. Install the camshaft and rocker arm assemblies into the head (see Part Engine Repair Without Removing It From The Car - Civic Models of this Chapter).
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