Valve Stem Oil Seals
- If valve or valve seat has not been damaged, valve springs, seals and retainers may be replaced by holding affected valve against seat using air pressure. Cup or umbrella type seals are used on all valves.NOTE: An adapter can be constructed by welding an air hose connection to body of spark plug with porcelain removed.
- Install Compressed Air Line Adapter (6513-ABA) in spark plug hole. A minimum of 140 psi (9.8 kg/cm2 ) line pressure is required. If air pressure does not hold valve shut, valve is damaged or burnt and cylinder head must be removed for service.
- With valve in head, install plastic seal protector cap over end of valve stem. Oil protector cap and start stem seal carefully over cap. Push seal down until seal jacket touches top of valve guide. Remove plastic seal protector cap. Using seal installer, bottom seal on valve guide.