Checking supporting elements with hydraulic clearance compensation |
Special tools and workshop equipment required |
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| It is not possible to service the supporting elements with hydraulic clearance compensation. |
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| Irregular valve noises when starting engine are normal. |
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| Start engine and let it run until the radiator fan has switched on once. |
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| Increase engine speed to approx. 2500 rpm for 2 minutes (perform road test if necessary). |
Note If the irregular valve noises stop but recur repeatedly during short trips, renew the oil filter bracket with oil retention valve → Item. |
If the supporting elements with hydraulic clearance compensation are still noisy, proceed as follows to determine defective supporting element: |
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| Turn crankshaft until cams of supporting element to be tested are at top: |
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| Vehicles with manual gearbox: push vehicle forwards with 4th gear engaged and ignition switched off. |
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| Vehicles with multitronic gearbox: remove noise insulation and rotate crankshaft in clockwise direction via crankshaft sprocket central bolt. |
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