BMW 640i Repair and Maintenance
A guide to problems, costs, maintenance and repair for your BMW 640i
BMW 640i RecallsEngine Timing Bolts May Loosen And Break
The bolts that secure the housing for the variable camshaft timing adjustment unit can loosen over time and possibly break, causing engine damage and engine stalling. Dealers will replace the four bolts for both intake and exhaust timing units free of charge to resolve the concern.