| Testing hydraulic bucket tappets |
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| Always replace bucket tappet complete (cannot be adjusted or repaired). |
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| Irregular valve noises when starting engine are normal. |
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| After installing new bucket tappets, the engine must not be started for about 30 minutes. (Otherwise valves would strike the pistons), then turn the crankshaft fully twice. |
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| After carrying out work on the valve gear, carefully crank engine at least 2 revolutions to ensure that no valve touches the piston when the engine is started. |
| Special tools and workshop equipment required |
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| Wooden or plastic wedge |
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| Start engine and allow to run until the radiator fan has cut in once. |
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| Increase engine speed to about 2500 rpm for 2 minutes. |
| If the hydraulic bucket tappets are still loud, determine the faulty tappet as follows: |
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| Turn the crankshaft clockwise at the central screw of the crankshaft timing belt sprocket until the cams of the bucket tappets to be tested are positioned on top. |
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