| Checking hydraulic valve compensation elements |
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| The hydraulic compensation elements cannot be serviced. |
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| Irregular valve noises when starting engine are normal. |
| Special tools and workshop equipment required |
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| Start engine and run until radiator fan has started up 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 retention valve. Fitting location of oil retention valve → Chapter. |
| If the hydraulic compensation elements are still noisy, locate the defective element as follows: |
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| Turn the crankshaft until the cam for the compensation element to be checked is pointing upwards (push vehicle forwards with 4th gear engaged and ignition switched off). |
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