| Checking hydraulic valve compensation elements |
| Special tools and workshop equipment required |
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| Hydraulic valve compensation elements cannot be serviced. |
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| Irregular valve noises when starting engine are normal. |
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| Start engine and run until coolant temperature reaches approx. 80 °C. |
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| Increase engine speed to approx. 2500 rpm for 2 minutes (perform road test if necessary). |
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| If the irregular valve noises stop but recur repeatedly during short trips, renew the oil retention valve. |
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| The oil retention valve is located below the oil filter bracket → Chapter. |
| If the hydraulic valve compensation elements are still noisy, locate the defective element as follows: |
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| Rotate crankshaft until cam of hydraulic compensation element to be checked faces upwards. The procedure is: |
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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 automatic gearbox: rotate crankshaft in clockwise direction via central bolt for vibration damper. |
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