1997 BMW Z3 Roadster Cylinder Head Assembly: Service and Repair.pdf

 1997 BMW Z3 Roadster Cylinder Head Assembly: Service and Repair

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Engine Installed Removing intake filter housing with mass air flow sensor, refer to Powertrain Management Removing cylinder head cover, refer to Valve Cover Removing all spark plugs. Removing intake air manifold, refer to Intake Manifold Removing VANOS adjustment unit, refer to Camshaft, Lifters and Pushrods, Camshaft, Engine. Unfastening sensor for cylinder recognition, refer to Powertrain Management, Cylinder Identification Sensor, Service and Repair. Drain off coolant and dispose of correctly. Installation: Tightening torque, refer to Engine Specifications Bleeding cooling system and checking for water leaks, refer to Cooling System Remove exhaust pipe from exhaust manifold. Release water hose from branch flange.

Unfasten heating intake and heating return hoses. Removal of cylinder head is described separately from installation. Assembly sequence for removal and installation is different. Unfasten screws and remove washer from exhaust camshaft. Unfasten nuts from thrust washer (intake camshaft). Remove thrust washer. Remove sprockets and chain. Remove secondary chain tensioning device. Unscrew chain guide. Lift off sprocket with chain. Note: Secure chain with wire to prevent it from dropping. Unscrew timing-case cover to cylinder head bolts. Untighten cylinder head screws from outside to inside with special tool 11 2 250 in the sequence 14 … 1. Lift off cylinder head. Installation Installation of cylinder head is described separately from removal. Assembly sequence for removal and installation is different. Caution: Rotate engine on central screw counter-clockwise to approx. 30° before TDC.