S 500 Sedan (140.051) V8-5.0L (119.980) (1996)
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Remove coolant pump (3). See: Water Pump
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Unscrew screw plug (35) with seal (36). Tighten to 15 Nm on reassembly.
Installation Note: Replace seal (36) according to condition.
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Remove tensioning rail pin (37) with impact puller (02) and threaded insert (03), special tools 116 589 20 33 00 and 116 589 01 34 00.
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Remove tensioning rail (38).
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Unscrew fit collar bolts; (a) and (b) and bolts (d) and (e) of timing case cover. Tighten to 21 Nm on reassembly.
NOTE:
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When performing repairs, fit collar bolts or the bolts + washers should be installed depending on the bolts fitted previously.
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On engines 119.98, the center bolts (b and e) are discontinued; if the timing case cover is replaced on engines 119.97, it should be bolted on to
the left and right cylinder head with two bolts each.
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Remove front crankshaft radial seal (15). See: Seals and Gaskets/Front Crankshaft Seal/Service and Repair
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Remove oil pump (25).
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Unscrew bolts (f), (g) and (h) at front of timing case cover (9). Tighten to 21 Nm on reassembly
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Remove timing case cover (9).
NOTE:
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Use a bent piece of metal to detach oil pump chain (26) at the crankshaft sprocket (27) and attach.
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Replace front crankshaft radial seal.
CAUTION: Do not damage cylinder head gaskets (arrows).
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Replace O-rings (23) and (24) for sealing the coolant ducts.
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Clean sealing surfaces.
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Coat sealing surfaces with sealant 002 989 47 20 10.
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Coat cylinder head gaskets (arrows) with engine oil.
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Installation is reverse of removal procedure, observing all installation notes and tightening specifications. Note dowel sleeve (29) and dowel pin
(29a).
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Check for leaks with engine running.