BMW 318/325/M3/525/535/M5 1989-1993 Repair Information
Valve Stem Seals
Remove the valve spring and valve.
Remove the valve stem seal with a removal pliers or equivalent.
Lubricate the valve guide and stem. Place the valve in the valve guide. Put the lower retainer into place. Wrap the end of the valve stem with thin tape or use bmw tool 11 1 340 (M30), 11 1 350 (M20), 11 1 360 (S14 and S38), 11 1 380 (M42 and M50) to protect the valve stem seal as it is slid over the retainer grooves in the valve stem.
Press the new valve stem seal into place with tool 11 1 200 or equivalent. The tool fits over the valve stem and provides even pressure to the seal as it is pressed down.
Install the spring.