S 420 (140.043) V8-4.2L (119.981) (1996)
Valve Guide Seal: Service and Repair
Preparation
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valve springs removed. See: Cylinder Head Assembly/Valve/Service and Repair
Overview
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Remove valve stem seals (16) with pliers (1) 104 589 00 37 00.
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Debur valve stems, if necessary.
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Fit protective sleeve (2) onto valve stem, remove.
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Oil valve stem seals (16).
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Press correct valve stem seals (16) on by hand with the correctly sized assembly drift, see table below.
8 and 9 mm assembly drift, tool No. 104 589 01 43 00
7 mm assembly drift, tool No. 119 589 00 43 00
NOTE:
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Valve stems and assembly sleeves are supplied as a repair kit.
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Valve guides which are worn at the retaining groove for the valve stem seals and valves with damaged valve ends or valve stem must be
replaced.
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Valve stem seals with bent metal shell must be replaced.
Distinguishing Features Of Valve Stem Seals