| Checking hydraulic compensation elements |
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| Hydraulic compensation elements cannot be serviced. |
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| Irregular valve noise during starting is normal. |
| Special tools and workshop equipment required |
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| Start engine and run until the radiator fan has switched on once. |
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| 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, the oil retention valve must be renewed. The oil retention valve is located in the oil filter bracket → Item. |
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| If the hydraulic compensation elements are still noisy, find out which is the defective compensation element as follows: |
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| Turn crankshaft by the bolt for the toothed belt wheel until cam of supporting element to be tested is facing upwards. |
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