Removal and installation of valve seat rings 01.8 352/352 A Installation Place valve seat rings in container full of liquid oxygen, allowing rings to shrink for about 20 to 30 minutes. 3 Take valve seat rings out of liquid oxygen and place on bore of heated cylinder head. 2 Heat cylinder head to 80 0 C. 4 Knock valve seat rings into position, using spe· cial tool No. 9. Note: Do not delay in fitting the valve seat rings. Do not touch liquid oxygen or come into contact with freezing valve seat ring. UKD 30'402 2142-01 6.4/3