| Checking hydraulic bucket tappets |
| Special tools and workshop equipment required |
Note | t
| Hydraulic bucket tappets cannot be serviced. |
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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 retention valve. The oil retention valve is located in the oil filter bracket → Item. |
| If the hydraulic tappets are still noisy, locate defective tappet as follows: |
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| Turn crankshaft until cams of the bucket tappet to be checked are at the top (push vehicle in direction of travel with fourth gear engaged and ignition switched off). |
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