300SEL (126.025) L6-3.0L (103.981) (1988)
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Position piston of No. 1 cylinder to TDC (arrow).
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Positioning marking (22) or positioning hole of camshaft must be aligned with the marking (5) on 1st camshaft bearing.
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Effective 12/86 the positioning hole (21) is provided in place of the pin (22).
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Install all components in the reverse order of disassembly.