| Checking hydraulic bucket tappets |
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| Hydraulic bucket tappets 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 leave it running until coolant temperature has reached approx. 80 °C. |
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| Increase engine speed to about 2500 rpm for approx. 2 minutes; perform test drive if necessary. |
Note | If irregular valve noise disappears but repeatedly re-occurs when travelling short distances, renew oil retention valves. Fitting location of oil retention valves: beneath cover on intake manifold → Chapter. |
| If the hydraulic tappets are still noisy, locate defective tappet as follows: |
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| Turn crankshaft until cams of the cylinder 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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