27. First of all, as a rule, the wheel / sprocket of the exhaust camshaft is removed. Removing the gear/sprocket, depending on the version, can be done in one of two ways. If the front of the camshaft is made in the form of a hexagon, it is necessary to unscrew the gear / sprocket mounting bolt using a socket, holding the shaft from turning with a second open-end wrench (see resist. illustration) If such a hexagon is absent, or in some cases access to it is closed, removal is carried out using special devices installed in the holes of the wheel / sprocket (see below).
5.27. Removing the camshaft drive gear (on the example of the Z18XE engine)
28. Install fixtures KM-6347 and KM-956-1 (see resist. illustration) so that the grooves of the KM-6347 tool engage with the wheel and, turning the tool clockwise, tighten the 2 fixing bolts. Use the help of an assistant to keep the wheel/sprocket from turning using the installed tools, unscrew the fixing bolt and remove the wheel/sprocket. Remove the fixture. Repeat the procedure to remove the other wheel/sprocket (with appropriate performance).
5.28. Removing the camshaft gear: 1. Adaptation KM-6347; 2. Adaptation KM-956-1; 3. Attachment bolts; 4. Wheel fixing bolt
29. When performing assembly operations, install the wheels / sprockets one by one in their places - tighten their mounting bolts by hand.
Note: The intake and exhaust camshaft gears are different on some models - be careful.
Then, while keeping the wheels/sprockets from spinning (see above) tighten the fixing bolts to the required torque. In this case, the alignment marks of the wheel and camshaft must match - usually they are made in the form of guide pins or keys.
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