New valve seals must be installed when the valve train is put back together. Umbrella seals slip over the valve stem and guide boss, while others require that the boss be machined. In some applications Teflon guide seals are available. Check with a machinist and/or automotive parts store for a suggestion on the proper seals to use.
See Figures 1, 2 and 3Cylinder Head Installed
- Remove the rocker arm cover.
- Be sure both valves are closed on the cylinder to be serviced.
- Remove the spark plug, rocker arms and push rods on the cylinder to be serviced.
- Install air line adaptor tool J-23590 or equivalent to the spark plug port and apply compressed air to hold the valves in place.
- Compress the valve spring and remove the valve locks, rotator, and spring.
- Remove the valve stem seal or head oil seal, if present.
- Install the head oil seal over the valve stem and seat it against the head, if used.
- Set the valve spring and rotator in place. Compress the spring and install the valve stem seal in the lower groove of the stem, making sure the seal is flat and not twisted. A light coat of oil on the seal will help prevent twisting.
- Install the valve locks and release the compressor making sure the locks seat properly in the upper groove of the valve stem. Grease may be used to help retain the locks in place while releasing the compressor.
- Install the spark plug and install the push rods and rocker arms.
- Adjust the valves (Chevrolet built engines only), and install the rocker arm cover.
- Remove the cylinder head from the engine.
- Remove the rocker assembly.
- Remove the valve springs and remove the old oil seals.
- Lubricate the valve stems with clean engine oil.
- Lubricate and position the seals and valve springs, again one valve at a time.
- Install the spring retainers, and compress the springs.
- With the valve key groove exposed above the compressed valve spring, wipe some wheel bearing grease around the groove. This will retain the keys as you release the spring compressor.
- Using needlenose pliers (or your fingers), place the keys in the key grooves. The grease should hold the keys in place. Slowly release the spring compressor; the valve cap or rotator will raise up as the compressor is released, retaining the keys.
- Install the rocker assembly, and install the cylinder head(s).