Servicing valve gear
Checking hydraulic bucket tappets
Special tools, testers and auxiliary items
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◆ Feeler gauge
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◆ Wood or plastic wedge
Notes:
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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.
Test sequence
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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.
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 the play is in excess of 0.1 mm, renew bucket tappet. If the play is less than 0.1 mm or no play, proceed with check as follows:
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