300SL (129.061) L6-3.0L (104.981) (1991)
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NOTE:
If the top curved slide rail (a) is removed from its bearing, the pressure pin in the chain tensioner moves in the tensioning direction by one detent.
The chain tensioner must be removed to ensure the timing chain is not overtensioned.
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Engine 104.98: Unbolt heating return pipe (25) from the fan bearing bracket (28). Unbolt guide pulley.
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Engine 104.99: Unbolt cable terminal 4 between high voltage distributor and ignition coil from timing case cover (b).
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All engines: Unplug connections at position sensor, camshaft and solenoid.
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Unbolt screw plug.
Installation Note: Push back spacer pin to enable fronmt cover to be more easily installed. Install front cover and screw on plug (arrow).
