| Checking hydraulic bucket tappets |
| Special tools and workshop equipment required |
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| Renew defective tappet complete (cannot be adjusted or repaired). |
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| Irregular valve noises when starting engine are normal. |
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| Start engine and run until engine oil temperature is min. 80 °C. |
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| Increase engine speed to about 2500 rpm for approx. 2 minutes. |
| If the hydraulic tappets are still noisy, locate defective tappets as follows: |
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| Remove cylinder head cover. |
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| Rotate crankshaft clockwise, until cam of the tappet to be checked is pointing upwards. |
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| Determine play between cam and bucket tappet. |
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| If play is greater than 0.1 mm, renew the tappet. If play is measured at less than 0.1 mm or there is no play, continue the check as indicated below: |
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| Press tappet down with a wooden or plastic wedge. If free travel in excess of 1 mm is felt before tappet contacts valve, renew tappet. |
Note! | After installing new tappets the engine must not be started for approx. 30 minutes. Hydraulic compensation elements must settle (otherwise valves will strike pistons). |
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