BMW Coupes and Sedans 1970-1988 Repair Guide
Timing Chain Sprocket
REMOVAL & INSTALLATION
Remove the timing chain as described above, remove the oil pan as detailed earlier in this chapter.
Remove the 3 oil pump drive sprocket mounting bolts. then, remove the sprocket and oil pump drive chain. Remove the woodruff key from the crankshaft.
Pull the sprocket off the crankshaft with a puller.
Reverse the removal procedure to install. On 6-cylinder engines, when the oil pump chain is installed, check play in the oil pump drive chain and, if necessary remove the oil pump and change the thickness of the shims, as detailed in "Oil Pump Removal and Installation" in this chapter.