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Home >> BMW >> 1978 >> 630CSi Standard Trans >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> 5301, 633CSI & 733I 6 Cylinder >> Crankshaft Main & Connecting Rod Bearings >> Timing Chain Replacement

Timing Chain Replacement

  1. Rotate crankshaft until number one cylinder is at TDC of compression stroke. Rotor should point to notch in distributor. Remove front engine covers as previously outlined. Mark front side of timing chain for installation.
  2. Bend over lock tabs and remove camshaft sprocket with timing chain. If mileage of vehicle exceeds 30, 000 miles, replace timing chain. Replace sprockets if worn or damaged.
  3. To replace crankshaft sprocket, remove oil pan, oil pump chain and sprocket, and crankshaft Woodruff key. Pull off sprocket with puller (11 2 000). To install, reverse removal procedure and adjust oil pump chain tension.
  4. To install timing chain, reverse removal procedure, making sure number one cylinder is at TDC of compression stroke. Line up tapped hole in sprocket hub with cast protrusion in cylinder head and install timing chain and sprocket.
    Fig 1: Correct Alignment for Timing Chain Installation
    G09334317Courtesy of BMW OF NORTH AMERICA, INC.
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