S4 V8-4.2L (BHF) (2004)
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Place guide plate VAS 5161/7 from disassembly and assembly device VAS 5161 on cylinder head.
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Secure guide plate VAS 5161/7 with knurled screws VAS 5161/12.
Note: If guide plate cannot be screwed on, enlarge mounting holes by approximately 0.5 mm.
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Insert drift VAS 5161/3 into guide plate and loosen stuck valve keepers using a plastic hammer.
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Screw engaging device VAS 5161/6 with installation forks VAS 5161/5 into guide plate VAS 5161/7.
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Guide installation cartridge VAS 5161/8 into guide plate VAS 5161/7.
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Screw adapter T40012 with gasket by hand into respective spark plug thread and apply constant pressure.
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Minimum pressure: 6 bar positive pressure.
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Engage pressure fork VAS 5161/2 at engaging device VAS 5161/6 and press down installation cartridge VAS 5161/8.
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At same time, turn knurled bolt of installation cartridge VAS 5161/8 toward right, until points engage in valve keepers.
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Lightly move knurled bolt back and forth, this causes valve keys to be pressed apart and captured in installation cartridge VAS 5161/8.
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Release pressure fork VAS 5161/2.
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Take out installation cartridge VAS 5161/8.
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Unbolt guide plate VAS 5161/7.
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Pressurized air hose remains connected
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Pull off valve stem oil seals using valve seal removal tool 3364.