Removing and Installing Camshaft Adjusters
Removing and installing camshaft adjustersTools
Preliminary work for removing camshaft timing gear
1. Remove camshaft housing cover.
Tools and materials
Special tools
Removing camshaft adjusters
Note:
^ The timing is always set simultaneously on both cylinder banks. Once a cylinder bank has been set, the crankshaft must not be turned to set the other cylinder bank!
^ The fastening screws of the chain sprockets must be replaced after removal.
^ The diamond washers of the chain sprockets must be replaced after removal.
^ The screws on the sprocket wheels are tightened by hand during assembly and are then loosened by one or two turns. This play is necessary so that the camshafts can still be turned.
^ The cylinder bank is set with the standard chain tensioner that is installed.
ATTENTION Damage to engine by turning crankshaft against the rotation direction of the engine (engine assembled)!
^ Never rotate crankshaft against the operating direction if the timing drive mechanism is mounted (timing chain jumps over).
^ Proceed carefully while working as otherwise the engine can be damaged.
^ Always turn the engine on the crankshaft and never on the camshaft as the timing chain may jump over.
^ After working on the camshaft wheels, the timing must be set.
^ Please observe the general warning notes and working regulations
1. Using socket 9714, turn the crankshaft until cylinder 1 is located at ignition TDC.
Note: If the cams on cylinder 1 are not positioned as shown, check whether the crankshaft needs to be turned through another turn (360°)
2. Make sure that the cams for the 1st cylinder and 5th cylinder are positioned as shown (cylinder 1 at ignition TDC) -see figure- and View shows position of cams on cylinder 5.
3. Insert fixing pin 9595/1 into the relevant groove in the timing chain housing cover through the bore provided in the crankshaft wheel -see figure-.
4. Remove chain tensioner -arrow-.
5. Loosen the timing chain and pull the upper plastic guide off the two pins. If necessary, use a ring wrench to turn the camshaft timing gear back and forth to provide more clearance for the timing chain between the wheels.
Note: The fastening screw and diamond washer of the camshaft adjuster only need to be replaced if removed.
6. Only loosen the fastening screw of the camshaft timing gear (one or two turns). To do this, use a ring wrench to counter at the a/f 32 hexagon on the camshaft adjuster and on the camshaft timing gear of the corresponding camshaft. Unscrew only the M12 cheese head bolt of the camshaft adjuster using a T60 socket -figure shows procedure without timing-case cover for a better view-.
7. Loosen the camshaft adjuster from the back with a rubber hammer.
ATTENTION Engine damage due to small parts falling into the timing case (e.g. diamond washer)!
^ Do not let the diamond washer under the camshaft timing gear and camshaft adjuster fall into the timing case.
Note: There is a diamond washer between the camshaft and camshaft timing gear or camshaft adjuster. This must be replaced after the corresponding wheel has been removed. If the fastening screw of the wheel is only loosened in order to adjust the timing (1 or 2 revolutions), the diamond washer and fastening screw do not need to be replaced.
8. With both hands, carefully take the camshaft adjuster out of the chain.
9. Remove the diamond washer which is located underneath the camshaft adjuster.
Installing camshaft adjusters
ATTENTION Damage to engine by turning crankshaft against the rotation direction of the engine (engine assembled)!
^ Never rotate crankshaft against the operating direction if the timing drive mechanism is mounted (timing chain jumps over).
^ Proceed carefully while working as otherwise the engine can be damaged.
^ Always turn the engine on the crankshaft and never on the camshaft as the timing chain may jump over.
^ After working on the camshaft wheels, the timing must be set.
^ Please observe the general warning notes and working regulations
Note: If the diamond washer and pan-head screw M12 are removed, replace the camshaft.
1. Replace the diamond washer and M12 cheese head bolt which are located underneath the camshaft adjuster.
ATTENTION Engine damage due to small parts falling into the timing case (e.g. diamond washer)!
^ Do not let the diamond washer under the camshaft timing gear and camshaft adjuster fall into the timing case.
2. Lift timing chain and place camshaft adjuster carefully on the camshaft. In order to have more play in the timing chain, if necessary turn camshaft timing gear back and forth. Place timing chain on camshaft adjuster.
3. Fit plastic guide of the timing chain.
4. Position new M12 fastening screw and hexagon on the camshaft adjuster and screw in loosely (it must still be possible to turn the camshaft timing gear) -figure shows fastening screw and hexagon before installation-.
5. Install chain tensioner -arrow-. For chain tensioner tightening torque.
Subsequent work for installing camshaft timing gear
1. Adjust timing'150516 Adjusting the timings for the camshafts'. After adjusting the timing, tighten the camshaft timing gears and camshaft adjusters Initial tightening: 7.5 ft-lb. Initial tightening: 37 ft-lb. Final tightening: 135° Initial tightening: 7.5 ft-lb. Initial tightening: 37 ft-lb. Final tightening: 90°.
2. Install camshaft housing cover.