Servicing valve gear
Checking hydraulic bucket tappets
Auxiliary equipment required
-
◆ Feeler gauge
-
◆ Wood or plastic wedge
Notes:
-
◆ Hydraulic tappets cannot be adjusted or repaired.
-
◆ Irregular valve noise during starting is normal.
Test sequence
-
‒ Start engine and run until the radiator fan has switched on once.
-
‒ Increase engine speed to about 2500 rpm for 2 minutes (perform road test if necessary).
Note:
If the irregular valve noises stop but recur repeatedly during short journeys, a new oil retention valve must be fitted. Oil retention valve fitting location: In oil filter bracket => -Item 17-7.
If the hydraulic tappets are still noisy, locate defective tappets as follows:
-
‒ Remove cylinder head cover .
-
‒ Rotate crankshaft until the cams of the bucket tappets to be checked are pointing upwards:
-
‒ Vehicles with manual gearbox: push vehicle forwards with 4th gear engaged and ignition switched off.
-
‒ Vehicles with automatic gearbox: Remove centre and right noise insulation.
-
‒ Turn crankshaft clockwise at crankshaft toothed belt sprocket central bolt.
|